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PLOS ONE logoLink to PLOS ONE
. 2020 Dec 10;15(12):e0243834. doi: 10.1371/journal.pone.0243834

Vaccines safety and maternal knowledge for enhanced maternal immunization acceptability in rural Uganda: A qualitative study approach

Dan Kajungu 1,2,*,#, Michael Muhoozi 1,#, James Stark 3,, Daniel Weibel 4,, Miriam C J M Sturkenboom 2,
Editor: Holly Seale5
PMCID: PMC7728220  PMID: 33301495

Abstract

Background

Maternal immunization is a successful and cost-effective public health strategy. It protects pregnant women and their infants from vaccine-preventable diseases. Uganda is exploring new vaccines for pregnant women like replacing Tetanus Toxoid (TT) with Tetanus-Diphtheria (Td). Research on knowledge, attitudes, beliefs, and willingness among pregnant women is needed before the introduction of vaccines for pregnant women. This study was aimed at exploring maternal knowledge, attitudes, willingness, and beliefs towards maternal immunization among pregnant women in rural Uganda.

Methods

This was a qualitative descriptive study. Ten focus group discussions (FGDs) were conducted at antenatal care (ANC) clinics and in a rural community of Uganda. Five key informant interviews (KIIs) were done with health workers, for triangulation. Considering context and research characteristics, data were collected and thematically analyzed.

Results

Women were familiar with the importance of maternal vaccines, had positive attitudes, and expressed willingness to take them. Acceptance of a new vaccine could be affected by worries of pregnant women and that of their partners, who influence health seeking decisions in a home concerning adverse events, following the maternal immunization (AEFI). There were misconceptions about introduction of vaccines such as the belief that vaccines treat malaria and general body weakness, and being used as guinea pigs to test for the vaccine before its introduction to the larger population.

Conclusion

A range of diverse sentiments and beliefs may affect uptake and acceptability of vaccines that are introduced in communities. For instance, ignoring vaccine safety concerns may impede maternal immunization acceptability, because pregnant women and their husbands are concerned about AEFI. Moreover, husbands make all health-seeking decisions at home, and their opinion is key, when considering such interventions.

Introduction

Maternal immunization is one of the most successful and cost effective public health strategies. Successes in protection of pregnant women and their infants from vaccine-preventable diseases, especially maternal and neonatal tetanus, are directly associated with reduced morbidity and mortality [1, 2]. In fact, immunization in pregnancy is shown to reduce neonatal mortality and illnesses such as influenza [3], pertussis [4], and tetanus [5].

Maternal immunization is vaccination of women during pregnancy, to induce a protective immune response in the mother, which increases the trans-placental transfer of specific Immunoglobulin G (IgG) to the infant, for protection of the infant against specific infections [6]. The World Health Organization (WHO) and the United States of America Centers for Disease Control and prevention (CDC) recommend use of maternal tetanus vaccine, Influenza vaccine, and Tdap vaccine, to provide protection of infants through protective maternal antibodies [79]. Evidence exists to show the maternal immunization effectiveness [10, 11] and safety [12, 13].

In Uganda, only Tetanus Toxoid (TT) or Tetanus Diphtheria (Td) are administered to pregnant women. Knowledge, attitudes and beliefs on maternal vaccines have not been studied in Uganda. Adverse outcomes due to low maternal vaccines uptake continue to persist. In fact, an estimate of 46% of the deaths that occurred during neonatal period, a bigger proportion were largely vaccine preventable infections [14]. The Ugandan national coverage for TT second dose (TT2+) is below the 80% target, with the National coverage among pregnant women at only 49% in 2011 [15]. This can partly be attributed to limited knowledge among pregnant women, their poor attitude about immunization, their failure to attend all ANC visits, lack of training of the Village Health Teams (VHTs) on the importance of TT vaccination for pregnant mothers, limited health education to pregnant mothers, and maternal vaccine safety concerns. Studies have shown that healthcare providers [16, 17], knowledge of patient and provider [18], improved ANC attendance and surveillance systems [17, 19] play an important role in maternal vaccination uptake.

There are global efforts to improve coverage and introduce new vaccines for both neonates and pregnant women. For instance, there are efficacy and safety studies ongoing in low- and middle-income countries in respect of Pneumococcal Conjugate Vaccine and Heptavalent pneumococcal conjugate vaccine, for pregnant and lactating women. International initiatives like the Global Alliance for Vaccines and Immunizations (GAVI) are working with public and private sectors with the shared goal of creating equal access to new and underused vaccines [20]. There is also the Partnership for Influenza Vaccine Introduction, which works in concert with WHO programs, to help countries prepare for pandemic influenza [21], and to support countries’ efforts to control and prevent seasonal influenza and to create sustainable, seasonal influenza vaccination programs in low and middle income countries [21].

Uganda, like other low- and middle-income countries (LMICs) is in the process of replacing TT with Td [22]. There are other novel vaccine candidates under development, however, research about maternal vaccine knowledge, attitudes, and beliefs has been sporadically conducted in LMICs [7].

Thematic framework

The study adopted the Andersen and Newman Behavioural Model [23] for health service utilization to permit systematic identification of factors that influence individual decisions, the environmental and need factors for vaccine acceptance. This was then modified it using Handy et al. 2017 [24] for interrelationships that drive vaccine acceptance. In order to understand vaccine acceptance, there is need to explore the underlying factors at various levels. In this case, the environmental factors were considered to be the underlying ones. These are mostly health systems related, and include availability of the needed vaccines at the service points, availability of healthcare workers and the attitude of healthcare workers towards pregnant women. The other factors affecting acceptance of maternal vaccines by pregnant women are the predisposing factors, the enabling factors, and the factors related to the need. These, however, tend to be affected by the environmental factors and are person specific as illustrated in Fig 1.

Fig 1. Perceived usefulness of external factors that inform acceptability of new vaccines introduced for maternal immunization in rural Uganda.

Fig 1

Understanding of mothers’ readiness, knowledge, attitude and beliefs towards maternal vaccines, is essential to determine acceptance and uptake of vaccines, and vaccine hesitancy in maternal immunization in the African context. The aim of this study was to investigate the readiness, knowledge, attitudes and beliefs of pregnant women in Uganda towards maternal immunization.

Methods

Research method

The cross-sectional study was carried out among pregnant women in the community, and those attending ANC for a period of 2 months between June 2019 and July 2019. The study utilized a qualitative descriptive design, that helped to gain an understanding of the readiness, knowledge, attitudes and beliefs about maternal immunization in rural Uganda.

Research population

The study included pregnant women identified at ANC and maternity points of care; and from the communities of Iganga district in Eastern Uganda. The study also included health workers from two health facilities within Iganga. Participants in the community were identified by the VHTs, through purposive sampling.

Participant recruitment and data collection

All participants that consented to participate in the study were sampled from both the community and the health centers offering ANC to pregnant women. In the twelve sub counties, the research team used purposive sampling technique to select pregnant women and health workers for face to face KII and FGD interviews respectively. We included all pregnant women available at ANC and maternity points of care in June and July 2019, at the visited health facilities in Iganga. During the same period, pregnant women in the communities were identified and invited by the VHTs for FGDs. We excluded all pregnant women unwilling or unable to provide signed informed consent (one), and those who had any illness or complications that the investigator felt would be harmful and stopped active participation, including moderate and severe pain. A total of 10 FGDs and 5 KIIs from the health facilities and communities were purposively selected from counties of Kigulu South, Kigulu North and Iganga Municipality. These were deemed adequate since participants resounded similar themes; a suggestion that the sample size was sufficient for saturation to be achieved. FGDs and KII lasted for approximately 90 minutes and 45 minutes respectively.

Research tool

A FGD and KII guide were developed to explore the knowledge, attitudes, willingness and beliefs about maternal immunization among pregnant women. Using WHO step by step guidelines for qualitative research [25], DK, MM, DW, JS and MCJM developed the FGD and KII, basing on theoretical categories in conceptualization. These guides were pretested and piloted in a similar population outside the study areas.

Data management and analysis

All audio recorded interviews in Lusoga (a local language), were translated and transcribed into English. A social scientist working with study team and village-based scouts at the Iganga Mayuge Health and Demographic Surveillance Site (IMHDSS) [26] translated the tool from English to Lusoga, and transcribed the audio recording in Lusoga to English. A consensus was reached in meetings, where inconsistencies existed. The transcripts were proof-read before importing them in a qualitative data management software—atlas.ti Version 6.0. Data coding and analysis was conducted subsequently.

The study team worked with a social scientist based at IMHDSS; first author DK has training and experience with qualitative field work in immunization, and MM has prior training and experience with qualitative research in maternal and health services research. The team developed an initial codebook, using a sample of transcripts. The developed codebook was later applied to the entire atlas project by two coders, with any emerging codes added in the process. The query reports and code-document tables were used to establish similarities in patterns and the magnitude of categories respectively.

Thematic analysis was used to identify patterns in the data that are important or interesting for use, to address the research question. Results were presented using themes with typical quotations from the pregnant women’s FGDs and supported by the evidence from KIIs.

Research validity and reliability

To achieve a complete picture of the society and the health system, women in the villages and those attending ANC, as well as health workers responsible for maternal vaccination, were interviewed. This presented an opportunity for validating results from participants regarding the study findings, and these were similar; thus reinforcing and validating the pregnant women reports. Prior to the study, an experienced study site team was trained in qualitative data collection techniques. Study site team members ensured that participants attending ANC and those in the community were provided a conducive environment to respond objectively. Experienced research assistants and village health team members (VHTs) (who carry out IMHDSS bi-annual data collection rounds), were trained on keeping the discussions lively, gentle, and friendly with a natural conversation, personal stories, laughter and sometimes disagreements; while ensuring that the discussions are in line with a discussion guide, to ensure that all the research questions are covered.

To appreciate the collective and comprehensive interpretation of the findings, the research teams were trained for one day on using separate reflexive journals to document both verbal and non-verbal responses that could not be extracted from the interview transcript. All the interviews were recorded and transcribed. To check the translation accuracy, the FGD guide was back translated from Lusoga to English. Inconsistencies were resolved in routine study supervisory meetings. A pilot study was conducted among a limited sample of participants (2 FGDs for pregnant women and 2 KIIs for 2 health workers) to evaluate the questions for their cultural appropriateness to the target population. Identification of new codes and probes was based on participant responses. This helped in expanding the sample size to capture and analyse data from a diversity of backgrounds.

Ethical considerations

Approval to conduct the research was obtained from the Mildmay Uganda Research and Ethics Committee (MUREC) (IRB Number: 0402–2019, and the study was registered by the Uganda National Council for Science and Technology (UNCST Number: HS-2669). Permission was also sought from the district authorities. Written informed consent was obtained from each participant, following a detailed explanation of the research purpose.

Results

A total of 10 FGDs and five (5) KIIs from 15 villages of rural, and semi-urban areas were conducted. A total of 90 pregnant women agreed to voluntarily participate in the study as shown in Table 1. They were individually approached by the moderator, to solicit for socio-demographic information before joining the focus group discussions. There were four (4) FGDs for women at health centers attending ANC, and six (6) from the community in both rural and semi urban settings. The median age was 24.3 years, and they were mostly Muslims, married and 75% had ever received TT. The forty main codes identified were grouped into four themes: Knowledge about maternal vaccines and immunization, pregnant women’s experience with maternal vaccination, cultures, norms & beliefs on maternal vaccination and readiness to receive new vaccines during pregnancy. Additional illustrative and summarized statements within each theme are shown in S3 File.

Table 1. Socio-demographic characteristics of study participants (N = 90).

Characteristics Category Number (%)
Age 18–24 years 53 (59%)
25–34 years 33 (37%)
35+ years 4 (4%)
Religion
Muslim 48 (53%)
Catholic 16 (18%)
Protestant 16 (18%)
Pentecostals 10 (11%)
Marital Status
Married 70 (78%)
Unmarried 20 (22%)
Highest education level
Primary 43 (48%)
Secondary 41 (46%)
Above secondary 3 (3%)
None 3 (3%)
Ever received TTa
Yes 75 (83%)
No 15 (17%)

aTetanus Toxoid Vaccine

Knowledge about maternal vaccines and immunization

Overall, pregnant women were knowledgeable and aware about the importance of maternal vaccination. Many were able to mention that vaccination prevents mothers and children from diseases like tetanus, measles etc. Many participants also knew that vaccination protects mothers from infection and provide immunity to the born and unborn babies. One of the participants stated that;

As pregnant women…., we are vaccinated Tetanus because a mother may deliver along the road and this vaccination for Tetanus saves the mother. Even when you deliver at home, the umbilical cord should be handled carefully and does not get Tetanus because of the vaccine injected during pregnancy” (FGD7).

The participants knew that they were receiving Tetanus Toxoid for protection of the baby as explained by one of the participants.

“Even when you give birth to a child, the baby will be free from tetanus. We hear tetanus is contracted during delivery.” (FGD4).

Some women had an idea about Hepatitis B (Hep B) and Human Papillomavirus (HPV) Vaccine. When probed further about these two vaccines, these pregnant women confirmed that they do not receive Hep B vaccine but did not know why.

One of the participants said “as pregnant women, we do not receive Hepatitis B…(FGD7) and another participant said “I don’t know the reasons why they don’t administer Hep B to pregnant women (FDG 8)

Some women had wrong understanding of maternal vaccination. They thought that vaccination was meant to prevent and treat malaria and general body weakness.

One pregnant woman shared that, “What I think about vaccination is that it prevents diseases like tetanus and others like malaria, body weakness…” (FGD 4) “…it helps babies not to be attacked by malaria(FGD 6) one woman added.

Pregnant women’s attitudes and beliefs towards maternal vaccination

Participants generally regarded maternal immunization as very important to them and their babies, and would take up vaccines given to them. One participant noted that,

When am pregnant just like I am, I must know that am supposed to go to the clinic or health centre for treatment…..”(FGD 1).

It was also noted that amidst their tight schedules and since maternal vaccination was only conducted on Monday and Tuesday, participants were ready to forego other responsibilities for vaccination. This respondent was quoted saying,

“The life of someone is very important. You can stop doing anything and attend to health workers and fulfil what he/she told you. So, I say that you have to go” (FGD 1).

On the other hand, participants expressed concerns about adverse events following immunization (AEFI). One respondent said that,

“When I get tetanus vaccine, I spend about 3 days when my body is paining” (FGD 5) and another respondent said, “…my hands get or become paralyzed” (FGD 5).

Participants expressed concerns about those who believed in traditional/local treatment and did not go for vaccination. One woman remarked,

“…because they have their traditional doctors who examine and tell them the condition of the baby in the womb and they don’t see the reason why they should go to a health facility” (FGD 3).

Other participants mentioned that some of the women preferred using traditional birth attendants and local herbs, as a remedy for complications that may occur during pregnancy. Health workers also highlighted that some of the women in the communities were using traditional remedies and would not consider going for vaccination. Participants also expressed that some pregnant women did not go for vaccination, due to their religious belief that prohibits vaccination like some Pentecostal churches. Fear of injections and HIV testing (which is compulsory for all women attending ANC) could be the reason some women fail to seek maternal vaccination.

Experiences of pregnant women with maternal vaccination

Majority of the participants who had received maternal vaccines acknowledged that the vaccination schedule was convenient and flexible enough, to enable them utilize the vaccination services. One pregnant woman said,

“I think the schedule is flexible because they inform us when to go back for antenatal so you can plan very well at home putting in mind that on such a date you must come back but the problem with other women they want to be sleeping at a time when she is supposed to go to the health facility …” (FGD 9).

Some pregnant women had received good treatment from health workers, most especially when they went early for accessing vaccination and ANC. One participant said,

“When you go early, there is no problem, but when you go late, they will tell you to come on the next day, since they will be tired already.” (FGD 3)

Health workers mentioned that amenities and vaccination were convenient for pregnant women, to acquire maternal vaccination. One health worker said,

“The vaccination schedule is really convenient because it helps them to get vaccinated at the time they have come for ANC….”(KII 3).

On the other hand, there were few participants who said that the maternal vaccination schedule was not convenient, and amenities were unfavourable. One of the participants said,

“….they should make it daily because there is when I went when I was sick, it was a Tuesday very early in the morning, I was even the first to arrive at the health facility and I waited up to 2:00 pm, but when the health workers came, they told me that if you are a new comer, you are supposed to come on Monday, and I went back home without even a medicine…. (FGD 9).

Another participant said,

“Pregnant women are prone to diseases like candida. Toilets at the facility are very dirty and you don’t have any way of protecting yourself and you want to ease yourself.” (FGD 9).

A few participants shared the fact that they had experienced long waiting time and different instances of stock outs for drugs including vaccines. Some health workers also acknowledged the fact that there was long waiting time, which was attributed to big patient health worker ratio. One health worker said,

Women who come for ANC are always very many, and you have to work for long hours to complete all of them and it is tiring to….(KII 4).

Other participants mentioned having had harsh, rude and abusive experiences with the health workers, while attending ANC. One of respondents said

Some health workers abuse patients telling them that they are dirty. (FGD 1).

Another woman said that,

Health workers abuse them. For example, if they see you aged and you had come for vaccination, they abuse you. (FGD 3).

Pregnant women’s willingness to receive new maternal vaccines

Women were willing to receive new maternal vaccines, as long as they acquired proper sensitization. Women were particularly interested in knowing the disease the vaccine prevents, schedule, when to receive it and its safety, to both themselves and their unborn babies. Majority of the participants also expressed concerns about the adverse effects due the vaccine that may be introduced. One of the respondents mentioned that

If the vaccine has no side effect to the baby and the mother, I will take it……. (FGD 5).

When health workers were asked what women are worried about, only one mentioned that the pregnant women and their partners were concerned about AEFI. One nurse narrated a conversation with one pregnant woman,

“…..she told that her husband said that if it (vaccine) can cripple an old child, then how about the unborn one…”(KII 1).

A few participants mentioned that some women believed that they were used to test for the safety of new vaccines, and thus they would not take the vaccines until its safety is confirmed by others who had received it. One of the participants said that, “If the vaccine is introduced, I first wait for example Hepatitis B. I have to wait and receive it later, after some people had been vaccinated (laughing)” (FGD 7).

The other respondent said that,

“For us as people, we are prepared but the problem is that they tell us that [the President of Uganda] wants to test the drugs on us the Ugandans from this side, so it’s after finding out that the drug (vaccine) has no problem, that is when it’s taken to his home area for administration” (FGD 2).

Partner involvement in decision making for maternal vaccination

Pregnant women generally recognized the role of their husbands in decisions making and reminders regarding vaccination, even without accompanying them and their children to immunization centers. Other participants acknowledged direct engagement of partners going for ANC and maternal immunization at health centers. Some health workers also encouraged pregnant women to come with their partners for ANC visits.

However, some women argued that partners do not play an important role in the maternal immunization, as they would sometimes not provide transport or company to the health facilities. One of the participants said that,

“When I tell my husband that am going for antenatal, he tells you to walk, yet you are tired you move without reaching you….” (FGD9).

A few pregnant women also said that some husbands to the women in the communities always express concerns of AEFI, while referring to incidences and rumors of AEFI.

Another woman commented that,

Some husbands refuse us because they say vaccination cripples children.

Some of the women believed that the health facilities strategies to encourage pregnant women to come with their partners were not effective, since women are not comfortable with moving with husbands. Moreover, the women who did not dress well found it embarrassing to come to the health facilities. A participant said that,

“They are dirty. One says I will not go because I will be a laughingstock, since my husband didn’t buy me maternity dress and I have rags” (FGD 4).

A small number of participants believed that this system discouraged pregnant women from accessing vaccination services. One pregnant woman said that,

“Some fail because they want to go with their husbands. There is a system in health facilities where they first work on pregnant women accompanied by their husbands. If the husband refuses to accompany them, they also don’t go” (FGD 10).

Discussion

Few studies assessing knowledge, attitudes and beliefs around maternal immunization have been conducted, both in an urban and rural setting as shown in the literature. This qualitative study was conducted among the Ugandan pregnant women in a semi-urban and rural settings. It highlights knowledge, attitude, beliefs and willingness of pregnant women to receive maternal vaccines. Overall pregnant women were knowledgeable about the importance of maternal immunization in providing immunity to the born and unborn babies, and had a good attitude towards maternal immunization. This finding is in agreement with other studies done in Africa [27, 28]. Messages could be well designed to focus on the impact of the disease on the infant, to increase likelihood of vaccination [29, 30].

Most women understood that they only received TT vaccine, but not Hepatitis B or Human papilloma vaccine (HPV) vaccines during their pregnancy while attending ANC. However, they do not know why they never received Hepatitis B and HPV vaccine. Lack of knowledge about other vaccines and the reasons why pregnant women are exempted from some vaccines and not the others, may prime vaccine hesitancy of any new vaccines to be introduced. This is consistent with research done in Mexico, that demonstrated that knowledge about pertussis vaccination was independently associated with the intention to receive maternal Tdap amongst pregnant women [31].

Although a small number of pregnant women viewed maternal vaccines as preventive measures for diseases like malaria and body weakness, this misinformation was also found by a recent Zambian study [32]. There is potential for vaccine hesitancy in such instances. For example, a woman who gets vaccinated with a specific maternal vaccine may hold high expectations, which include treatment of other diseases. Therefore, when she later develops such diseases like malaria that need treatment, it may affect her enthusiasm towards future vaccination, and resort to local remedies.

Pregnant women regarded maternal immunization as very important to them and their babies and are ready to go for vaccination, as long as it protected them and their babies. They however, expressed concerns regarding AEFI citing experiences regarding other vaccines other than maternal vaccines. With decreased perceived risk of vaccine-preventable diseases, fear for AEFI increases which may reduce compliance with vaccination [33]. This allows for hesitancy, compromise of coverage and re-emergence of the maternal vaccine preventable diseases [33, 34].

Despite rumors, community myths and misperceptions, pregnant women generally have trust and high expectations in the health care providers and the safety of maternal vaccines [35]. Women are emotionally attached to their pregnancies and highly consider the wellbeing of their children [36] and therefore, they need to be confident that nothing will cause any unwanted adverse outcome of their pregnancy. To mitigate worries of AEFI for pregnant women about potential risks to them and the developing fetus, there is need for a robust AEFI surveillance systems that specifically target pregnant women and their infants [37]. The passive surveillance systems could add a question about pregnancy and pregnancy outcome status to their routine AEFI surveillance reporting forms, to facilitate the process for causality assessment of serious AEFI in pregnancy and reporting of findings [37]. An approach that addresses any reactions as a result of maternal vaccines needs to be well communicated to the beneficiaries, to alleviate concerns of AEFI, while addressing the risk/benefit determinant (epidemiological and scientific evidence) explanations, in agreement with a number of studies done [38]. The surveys of active and passive surveillance for AEFI in pregnant women and their infants need to be repeated regularly, to verify if improvement has occurred, so as to build more trust in the system for detection of AEFI [37].

In the Iganga and Mayuge districts, 73% of women have used herbal medicine at least once during their pregnancy [39], and between 20%-89.9% of women in Africa use herbal medicine during their pregnancy [40]. Some participants in this study expressed concerns about those who believed in traditional/local treatment and religious practices like in some Pentecostal churches, that prohibited maternal vaccination. Such beliefs and rumors are said to potentially affect vaccine acceptability. Therefore, there is a need for development of an approach that is culturally sensitive, to correct any fallacies, and lessen issues related to vaccine hesitancy in LMICs, as recommended by earlier studies [32, 38].

Pregnant women were willing to receive new maternal vaccines, as long as they acquired proper sensitization, and were aware about the importance of the vaccine. However, women were concerned about the vaccine related adverse events that may be introduced. Yet maternal immunization programs not only in Uganda, but also other LMICs, have no evidence on sensitization about maternal vaccination [41, 42]. This is compounded by the rare, but important misconceptions surrounding the introduction of new vaccines. Some believe that the new vaccine would be tested on them before they are given to the rest. These beliefs need to be countered by sensitization efforts, which leverage on the political efforts to help community members gain confidence in the vaccination programs, and other health care services.

There is a general agreement that the current maternal vaccination schedule was convenient and flexible enough. Flexible schedules make uptake and completion of new maternal vaccines easy, which are important in maximising the advantages associated with maternal immunization and uptake. This is in agreement with a study in Australia that showed that high risk groups benefited from an accelerated schedule and increased the likelihood of completion [43]. The issue of vaccination schedule and amenities are health system issues, and were attributed to the set time by the facilities for attendance to ANC. Strategies that improve ANC attendance need to integrate messages for encouraging maternal vaccination among the poorest, single, multiparous women, and those who do not deliver at health facilities. Different studies have associated ANC attendance with timely vaccination, and adherence to the vaccination schedule [44, 45].

Behavior of a few of the health workers and how they treat pregnant women was termed as harsh, rude and abusive, which is a massive inconvenience while attending ANC. This is similar to findings in Ethiopia and Tanzania [46, 47]. Evidence has shown that a recommendation from a health care professional for vaccination is the most important factor in decision-making for uptake of a maternal vaccine [16]. This can positively or negatively influence how women, their partners and families perceive and experience maternal health care, and ultimately have an effect on ANC attendance [35, 48]. The health system needs to develop and maintain trust of pregnant women, through building capacity of health workers to uphold ethical values and make favorable health education and literacy activities in both routine and outreach programs.

Personal hygiene and dress code are some of the concerns that could stop women from taking up maternal immunisation. Some pregnant women feel that health workers mishandle them if they are dirty, while others are not able to come with their husbands to the clinic because they are not decent or even dirty. Studies in an African context have shown that women delay to attend ANC waiting for new clothes [29, 49]. Health promotion and education campaigns targeting maternal health services need to integrate communications that promote self-esteem, personal hygiene and non-discriminative practices for ANC attendance.

This study highlighted the importance of partner support in the maternal immunization initiatives. This is in agreement with a study done in Uganda that demonstrated that male involvement in immunization of children was important, for decision making of women to vaccinate their children [27]. However, contrary to their findings; some of the pregnant women felt that visiting the health facility with the partners for ANC and maternal immunization could delay decision making, cause embarrassment; which could potentially frustrate vaccine acceptance. Studies have shown that norms relating to fathers’ participating in ANC contribute to men feeling shy, embarrassed or ashamed to attend ANC with their pregnant partner [50, 51]. Polygamy is acceptable and practiced in this community, largely because Islam is the dominant religion. Consequently, men in polygamous relationships are less likely to accompany their partner to ANC, for fear of being perceived as favouring one wife over others, which may cause conflict in the household [50, 51]. No wonder many women felt that it was their responsibility to get vaccinated for their good and that of their children. There were suggestions that some women could not come for vaccination due to failure of their husbands to accompany them or provide transport to the health facilities. While feasibility of home vaccination for pregnant women has not been determined, use of VHT and mobile phone consultations and mobile clinics interventions for hard to reach women has been recommended [52, 53].

The partner’s worries about AEFI, was an important concern for women, which could affect the decision making around maternal immunization and acceptability. Integration of health education messages, that cover vaccines and their safety targeting partners’ role and involvement in maternal immunization, is important in facilitating vaccine acceptance and uptake. These factors must be considered when introducing a new vaccine, as they have the potential to enable or obstruct vaccine uptake.

Limitations

This study was done in rural area with some semi urban settings in Uganda and results of this study need to be taken in the context in which the study was done. Education and health literacy in rural areas is usually low [54], but very vital for maternal vaccination [55]. Future studies need to explore maternal vaccine willingness, knowledge, attitudes and beliefs, and impact of education and health literacy on maternal vaccination in an urban setting, where it is expected to have differing levels of education and social economic status.

Conclusion

Maternal vaccines have great potential to reduce the global burden of infant morbidity and mortality; with their unique position to access the infant’s immune system, through maternal antibodies, before a child vaccine could be effective. However, the existence of safe and effective maternal vaccines will only be useful, if mothers and their partners decide to use them with less or no worries about the AEFI.

Maternal immunisation knowledge, attitude and willingness for pregnant women, was generally positive. However, factors such as religion, cultures, fear for AEFI for new maternal vaccines, and wrongly believing that vaccines cure diseases like malaria and reduce general body weakness, could counteract maternal vaccination acceptability.

Recommendations

Health workers need to be trained using consistent message and provide proper training and orientation providers, on the importance of maintaining respectful and compassionate care at all times.

Efforts to improve education levels and health literacy of the community members and health care workers to some extent needs to be prioritized. Programming for maternal vaccination needs to address the individual or societal concerns, values, beliefs and norms of pregnant women, considering the context in which they are. This can be done by improving and establishing community engagements, sensitizations, outreaches and education programs on maternal vaccinations, to help reduce the burden of diseases that are maternal vaccine preventable in the Ugandan context. These will help to correct misconceptions, by replacing the existing myth with new information, rather than solely debunking an individual’s current belief [56].

Establishing a robust system for monitoring vaccine deployment, emphasis on safety monitoring, following immunization and disease surveillance, is also key for maternal vaccine uptake. A strengthened system for post-marketing surveillance of vaccines that enables timely AEFI reporting, will lead public confidence in vaccines, especially the new one. This can be done by intensifying efforts for active (in sentinels) and passive surveillance systems, to provide reliable data for regulators and public health authorities. These efforts need to harness collection, reporting, and comparison of data on vaccine safety in pregnancy, and contribute to the harmonization of vaccine pharmacovigilance.

Further research will be needed to explore misconceptions about vaccines, and anxieties about testing new vaccines to a small population, before they are rolled out to the rest, that could promote or discourage vaccine acceptance.

Supporting information

S1 File. Focus group discussion guide.

(PDF)

S2 File. Key informant interview guide.

(PDF)

S3 File. Thematic classification of additional quotes.

(PDF)

S4 File. COREQ checlist.

(PDF)

S5 File. Analysis codebook.

(PDF)

Acknowledgments

The authors would like to thank the Makerere University Centre for Health and Population Research (MUCHAP), the Iganga Mayuge Health and Demographic Surveillance Site (IMHDSS), for their partnership and collaboration for this work. This research would not have been possible without the support of Iganga District health office, local leaders, and community members that participated in the study.

Data Availability

All relevant data are within the manuscript and its Supporting Information files.

Funding Statement

This work was supported by the GCRF Networks in Vaccines Research and Development which was co-funded by the MRC and BBSRC. Grant Number: IMPRINT Network-ITCR079018. The funder provided support in the form of salaries for authors DK and MM but did not have any additional role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript. The specific roles of these authors are articulated in the ‘author contributions’ section.

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Decision Letter 0

Holly Seale

21 Aug 2020

PONE-D-20-15557

Vaccines safety and maternal knowledge are determinants of maternal immunization acceptability in rural Uganda – A Qualitative Study Approach.

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Reviewer #1: This novel study is an in-depth exploration of the attitudes and knowledge regarding maternal vaccination held by pregnant women and health workers in Uganda. Though many women were aware of the importance of maternal vaccination, there were many misperceptions. Both pregnant women and health workers reported that many women use traditional medicine as a means of prevention, rather than vaccination. A barrier for 12% of the women were that they belonged to Pentecostal churches and thus are forbidden from vaccination. Participants mentioned that there are only 2 days per week that they can visit a health clinic for vaccination; some said that the clinics were dirty, but more disturbingly, many women experienced abusive or lazy behaviour from health care workers. The authors reported that many of the women had safety concerns about vaccination, as did their husband/s, particularly regarding new vaccines. Many of the participants spoke about their husbands’ involvement in vaccination: some were supportive, but some said their husbands were embarrassed by their wife’s appearance, and some did not accompany them to the clinic. The results need to be published as a means to working towards improving pregnant women’s knowledge on vaccination and vaccine-preventable diseases, improving rural Ugandan women’s access to safe health services, and subsequently increasing maternal vaccine uptake. Thank you for the opportunity to read and review this important paper.

MAJOR COMMENTS:

1. Introduction

a. Given many of the women had safety concerns, and the authors suggest utilising a vaccine safety system, vaccine safety should be discussed in the introduction. Some suggested literature (though only on influenza):

i. Foo DY, Sarna M, Pereira G, Moore HC, Fell DB, Regan AK. Early childhood health outcomes following in utero exposure to influenza vaccines: a systematic review. Pediatrics. 2020 Aug 1;146(2).

ii. Giles ML, Krishnaswamy S, Macartney K, Cheng A. The safety of inactivated influenza vaccines in pregnancy for birth outcomes: a systematic review. Human vaccines & immunotherapeutics. 2019 Mar 4;15(3):687-99.

b. A brief comment on what’s known generally on the facilitators and barriers of maternal vaccination is warranted. Suggest reading and citing the following:

i. Kilich E, Dada S, Francis MR, Tazare J, Chico RM, Paterson P, Larson HJ. Factors that influence vaccination decision-making among pregnant women: A systematic review and meta-analysis. Plos one. 2020 Jul 9;15(7):e0234827.

c. Thematic framework and figure 1:

i. I like this figure. However, it is not clear to me where the ideas have come from? Did the authors refer to other models/theories, such as the Social Ecological Model?

ii. A description on why environmental factors were considered to be the underlying factors to vaccine acceptance is needed.

2. Methods

a. Participant recruitment and data collection:

i. When did the authors stop recruiting? Did they aim to get 10 FDGs and 5 KIIs from 5 villages and 90 women? Or is this when they felt they had reached ‘data saturation’?

b. Research tool

i. an explanation of who developed it and how it was developed is warranted

c. Data management and analysis:

i. Who translated and transcribed the audio recordings from Lusoga to English? And who translated them back from English to Lusoga? Was there consistent

ii. The authors say DK and MM developed the initial codebook. What is their experience with qualitative analysis? I note that their education is provided on page 1, but it is worthwhile positioning their level of expertise here too.

d. Research validity and reliability:

i. How did the study site team members provide a conducive environment?

ii. How trained the researchers on how to document verbal and non-verbal responses?

3. Results

a. How was the information for Table 1 collected? Was it self-report on a form? Or were participants asked in the focus group interviews?

b. There are a lot of brilliant quotes. However, having so many disrupts the flow for the reader. As many of the quotes are already summarised in the sentence before it, and therefore the quotes don’t add anything extra to that point, I suggest removing the quotes on the following lines:

i. Line 281

ii. Lines 287-288

iii. Lines 293-294

iv. Line 300

v. Lines 327-328

vi. Lines 360-362

vii. Line 393 (and instead add the word “reminders” to the sentence “…husbands in decision making and reminders regarding vaccination...”).

viii. Line 398

ix. Lines 403-404

c. Similarly, to help the flow of reading for the reader, I think the results in section 3.3 should be reformatted, to include all the positive comments or comments about convenience at the beginning, followed by all of the negative comments or comments about inconvenience at the end. It is currently mixed.

d. Lines 416-421. This is a striking result. I think the authors could make this section clearer, however. Furthermore, I understand that polygamy is legal in Uganda; when the participant on line 420 says “One says I will not go….” is this one of her husbands?

4. Discussion

a. There are a lot of bold statements in the discussion, that haven’t been referenced. Please either reword or find references. Some examples of unreferenced bold statements:

i. Lines 448-449: “For example, a woman who gets vaccinated and later develops a disease like malaria may fail to seek for future vaccination.”

ii. Lines 453-454: “With decreased perceived risk of immune-preventable diseases, fear for AEFI increases which may reduce compliance with vaccination.”

iii. Lines 457 – 459: “Pregnant women generally have trust and high expectations in the safety of maternal vaccines. Women are emotionally attached to their pregnancies and highly consider the wellbeing of their child….”

b. I’d be interested in reading about the abusive behaviour some health care workers have towards pregnant women. Do other LMIC countries experience this? Given a health care providers recommendation is one of the most important facilitators of vaccination, what’s the impact of the abusive behaviour on uptake? It would also be worthwhile noting that while health care workers should receive training on using consistent messaging (Lines 551-552), some appear to need training their behaviour and bedside manners.

c. I’d also be interested in reading about the impact of husbands on maternal vaccination. For example, the shaming husbands do of their wives’ appearances and clothes. Has this been documented anywhere else in the literature? Given husbands were also important in decision-making, how does this work in polygamous relationships? Finally, given that some women weren’t able to access health clinics as their husband would not accompany them, is home vaccination an achievable, acceptable and safe option for women in Uganda? Are there any other health services delivered in the home?

d. To me, there was also a theme about cleanliness/dirtiness. Some health workers abused patients if they were dirty, some women reported on dirty toilets at clinics, and some women said their husbands wouldn’t go with them to the clinic as the women were dirty. Further discussion about this, with potential solutions if there are any, would be interesting.

e. Safety surveillance: whilst this important, I’m not sure whether this is the first strategy that should be implemented. It’s also costly and will take time to implement. Consider other more-immediate interventions that may help these women. Some guidance in these papers:

i. Krishnaswamy S, Lambach P, Giles ML. Key considerations for successful implementation of maternal immunization programs in low and middle income countries. Human vaccines & immunotherapeutics. 2019 Apr 3;15(4):942-50.

ii. Ellingson MK, Dudley MZ, Limaye RJ, Salmon DA, O’Leary ST, Omer SB. Enhancing uptake of influenza maternal vaccine. Expert review of vaccines. 2019 Feb 1;18(2):191-204.

MINOR COMMENTS:

5. Title

a. The title should be revised. The word “determinants” is usually reserved for studies that have utilised quantitative methods.

6. Article summary

a. Line 56: Is this about women in Uganda? And about maternal immunisation?

7. Key words

a. Suggest using more specific MeSH terms, such as “Health Knowledge, Attitudes, Practice” and a term to describe Uganda

8. Introduction

a. Some of the sentences are quite long (e.g. lines 69-72). Consider shortening

b. It’s important that the references used directly relate to the topic. For example, line 71 discusses tetanus, but reference #2 is not about tetanus\\

c. Line 86: How was 40% update for TT2+ estimated? What data was collected/used? Is it a reliable estimate?

d. I suggest using systematic reviews as much as possible in the introduction. For example, the following systematic review should be referenced:

i. Nunes MC, Madhi SA. Influenza vaccination during pregnancy for prevention of influenza confirmed illness in the infants: a systematic review and meta-analysis. Human vaccines & immunotherapeutics. 2018 Mar 4;14(3):758-66.

9. Methods

a. When was the study carried out and how long did it go for? It would be worthwhile adding the year/s and duration into the ‘research method’ section

b. Participant recruitment and data collection:

i. As the reader, it would be clearer to move lines 157-162 to line 153, after “interviews at both the community and health facility.” This will help the reader understand how the research team purposively selected participants

10. Results

a. Table 1:

i. Given the numbers are <100, it is advisable to round the % to the nearest whole number

ii. The total number in religion does not equal 90

iii. A space is needed between the numbers and brackets

iv. Please spell out what TT means (underneath the table)

b. Knowledge about maternal vaccines and immunisation:

i. Please clarify whether this sentence “Many were able to mention that vaccination prevents mothers and children from diseases like tetanus, measles, etc” is referring only to vaccination during pregnancy, or vaccination of people in general?

c. Lines 357-358. I think the authors could expand on this and define what they mean by “sensitization.”

d. Line 383: I suggest removing the Ugandan President’s name, and just refer to them as the President of Uganda. I.e., you would write “we are prepared but the problem is that they tell us that [The President of Uganda] wants to test the drugs on us….”

e. Lines 409-410: This quote doesn’t relate to the sentence above it. Consider using another quote.

f. Line 421: Should “rugs” be “rags”?

11. Discussion

a. Lines 439-440: distinction is needed as to whether participants are talking about vaccination prior to pregnancy, or whether pregnant women think they haven’t yet been vaccinated against hepatitis B or HPV in their pregnancy?

b. Line 442: suggest using the word “prime” here instead of “encourage”

c. Line 453: please reword “immune” to “vaccine.”

Reviewer #2: Review of manuscript for PLOS ONE

Summary: This is a well done manuscript. The title, background, findings, and discussion are very well laid out. Methods need some clarity for reproducibility. Just a few suggestions to make it a little more crisp:

Comments on

Title: No comment

Abstract:

Lines 33 &34: You need to recast this sentence. “Women expressed willingness to take new vaccines, positive attitudes towards maternal immunization, and were familiar with its importance”. Recast the sentence to follow the order in your objectives namely knowledge, attitudes and willingness. For example: “Women were familiar with the importance of maternal vaccines, have positive attitudes and expressed willingness to take them”.

Line 35: “……... affected by adverse events”, ie changing the effects to events. Also recast the statement to be more sharp and crisp. Such as “………. affected by worries of pregnant women and that of their partners’ who influence health seeking decisions in a home concerning adverse events following the martenal immunization.”

Line 36-38: “Misconceptions about introduction of vaccines like thinking that vaccines will be tested on only them before introduction in larger population, and that vaccines treat illnesses like malaria and general body weakness.” Consider this phrase “ …… of vaccines such as the belief that vaccines treat malaria and general body weakness and that of being used as guinea-pig to test for the vaccine before its introduction to the larger population.”

Background:

Line 77: It is World Health Organization and not “world ….”

Line 80: “………. are administered to pregnant women.”

Line 82: Do you mean that poor neonatal health outcomes are due to lack of studies on knowledge ………. Make it clearer.

Line 87: Be consistent. “ Immunisation” is British English. You have been using American English. In addition, there is a little flaw in the content and mechanical accuracy in that sentence. You could consider “This can partly be attributed to limited knowledge among pregnant women, their poor attitude about immunization, their failure to attend all ANC visits, lack of training of the Village Health Teams (VHTs) on the importance of TT vaccination for pregnant mothers and limited health education to pregnant mothers.”

Line 92: “ ………. middle-income countries in respect of Pneumococcal Conjugate Vaccine ……….. “

Line 95: GAVI means Global Alliance for Vaccines and Immunizations.

Methods: This section need some work.

Line 144: You had included health workers in the research population included. You failed to include them now.

Line 153: Which of the population had FGD and which one had KII. You need to be coherent and orderly.

Line 157: Readers may find it difficult to understand what you mean. I think you may look at it again and recast it to bring out your points clearly.

Line 165: Order and sequence is important as mentioned in previous comment.

Line 174: Pointless mentioning names of those that played a role here.

Results:

Line 194: “ (2 FGDs pregnant women and 2 health workers) could read “(2 FGDs for pregnant women and 2 KIIs for 2 health workers)”, or what exactly, do you have in mind.

Line 208: Change the FDG to FGD. Where exactly is the study area; rural or urban or rural and semi-urban? Be consistent.

Line 239: You use either “reason” or “why”.

Line 250: I could have preferred “….one woman added” than the word chipped in. This is scientific writing.

Line 264: AEFI means adverse events following immunization. It refers to any untoward medical occurrence which follows immunization and which does not necessarily have a causal relationship with the usage of the vaccine.

Line 283: could read “ …… highlighted that some of ……”

Line 290: “Participants also expressed that some pregnant women did not go for vaccination due to their prohibitive religious practice like some Pentecostal churches”, could read “Participants …….. due to their religious belief that prohibited vaccination”.

Line 296: This statement “Some mentioned the fear for injections and HIV testing (which is compulsory for all women attending ANC) would be the reason why some women do not seek maternal vaccination” could read “Fear of injections and HIV testing could be the reason some women fail to seek maternal vaccination.”

Line 369: “When health workers were asked what women are worried about, only one mentioned AE worries from the pregnant women and their partners” could read “When health workers were asked what women are worried about, only one mentioned that the pregnant women and their partners were concerned about AEFI.”

Line 375: The statement could be rephrased thus “Some participants believe that they were used to test for the safety of new vaccines and thus they would not take the vaccines until its safety is confirmed by others who had received it.

Line 389: Could be rephrased as “Pregnant women …………. vaccination even without accompanying them and their children to immunization centers.”

Line 400: You may want to rephrase thus “Health workers cited that they encouraged pregnant women to come with their partners for ANC visits.”

Line 417: “…………. not effective since women are not comfortable with moving with husbands and more so their husbands don’t dress well.”

Discussion:

Line 434: be consistent with the study area.

Line 452: change adverse effect to adverse event

Line 475: Rephrase as “…………... and religious practices found in some Pentecostal churches, that prohibited maternal vaccination.

Line 482: Rephrase the statement for clarity

Line 486: Rephrase the statement. It could read “Some believe that the new vaccines …………...”

Line 502: delete treatment from the sentence.

Line 504: You can rephrase as “The attitudes and behaviors of health care providers towards pregnant women is an …….”

Line 517: Consider rephrasing thus, “……… get vaccinated for their good and that of their children”.

Line 518: Consider this rephrasing “The partner’s worries about AEFI was an important concern for women ………….”

Line 537: See the comment on line 34

Line 538: Define ADR. Do you mean Adverse Drug Reaction? Since we are talking of immunization why not use AEFI instead.

**********

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Reviewer #1: No

Reviewer #2: Yes: Dr Uchechukwu Joel Okenwa

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Attachment

Submitted filename: Review of manuscript on maternal immunization.docx

PLoS One. 2020 Dec 10;15(12):e0243834. doi: 10.1371/journal.pone.0243834.r002

Author response to Decision Letter 0


9 Oct 2020

Reviewer #1 Point by Point Response to Review of manuscript for PLOS ONE

1. Introduction

a. Given many of the women had safety concerns, and the authors suggest utilizing a vaccine safety system, vaccine safety should be discussed in the introduction. Some suggested literature (though only on influenza):

i. Foo DY, Sarna M, Pereira G, Moore HC, Fell DB, Regan AK. Early childhood health outcomes following in utero exposure to influenza vaccines: a systematic review. Pediatrics. 2020 Aug 1;146(2).

ii. Giles ML, Krishnaswamy S, Macartney K, Cheng A. The safety of inactivated influenza vaccines in pregnancy for birth outcomes: a systematic review. Human vaccines & immunotherapeutic. 2019 Mar 4;15(3):687-99.

Response: Thank you very much for pointing this out. A statement to illustrate evidence on maternal vaccines safety and effectiveness using the recommended and other literature has been included in the introduction. This has been included in the Introduction section line 88.

b. A brief comment on what’s known generally on the facilitators and barriers of maternal vaccination is warranted. Suggest reading and citing the following:

i. Kilich E, Dada S, Francis MR, Tazare J, Chico RM, Paterson P, Larson HJ. Factors that influence vaccination decision-making among pregnant women: A systematic review and meta-analysis. Plos one. 2020 Jul 9;15(7):e0234827.

Response: Thank you very much. A brief comment that includes facilitators for maternal vaccination has been included as per recommendation for the different evidence syntheses. The barriers have also been highlighted. These can be seen in the introduction section on line 100-102.

c. Thematic framework and figure 1:

i. I like this figure. However, it is not clear to me where the ideas have come from? Did the authors refer to other models/theories, such as the Social Ecological Model?

Response: Thank you for highlighting this, authors used Andersen and Newman Behavioural Model and modified using Handy et al 2017 and justification for using both was provided. This can be seen under the thematic framework section on line 124-127.

ii. A description on why environmental factors were considered to be the underlying factors to vaccine acceptance is needed. Resounded

Response: Thank you, this was briefly described in lines 127-134.

2. Methods

a. Participant recruitment and data collection:

i. When did the authors stop recruiting? Did they aim to get 10 FDGs and 5 KIIs from 5 villages and 90 women? Or is this when they felt they had reached ‘data saturation’?

Response: Thank you. More clarification on how data saturation was reached has been included to illustrate the basis for which recruitment was stopped. This can be seen in methods section, sub-section participant recruitment and data collection, line 185-186.

b. Research tool

i. an explanation of who developed it and how it was developed is warranted

Response: Thank you for this notification. An explanation was included illustrate how the tools were developed using the WHO step by step guide for qualitative research basing on the conceptualization framework. This can be seen in methods section, line 191-193.

c. Data management and analysis:

i. Who translated and transcribed the audio recordings from Lusoga to English? And who translated them back from English to Lusoga? Was there consistent

Response: A statement to clarify this has been added in line 198-201. ‘…... A social scientist working with the study team and village-based scouts at the Iganga Mayuge Health and Demographic Surveillance Site (IMHDSS) translated the tool from English to Lusoga and transcribed the audio recording in Lusoga to English. A consensus was reached in meetings where inconsistencies existed.’

ii. The authors say DK and MM developed the initial codebook. What is their experience with qualitative analysis? I note that their education is provided on page 1, but it is worthwhile positioning their level of expertise here too.

Response: Level of expertise has been added and explained in line 204 – 206.

d. Research validity and reliability:

i. How did the study site team members provide a conducive environment?

Response: Thank you. Clarification was provided with this statement in line 222-227. ‘Experienced research assistants and village health team members (VHTs) (who carry out IMHDSS bi-annual data collection rounds) were trained on keeping the discussions lively, gentle, and friendly with a natural conversation, with personal stories, laughter and sometimes disagreements; while ensuring that the discussions are in line with a discussion guide to ensure that all the research questions are covered.’

ii. How trained the researchers on how to document verbal and non-verbal responses?

Response: Thank you, we have clarified this by showing that “a one-day training” (line 230) for the research teams was provided on how to maintain journals for the verbal and non-verbal responses to complement their experience at the study site.

3. Results

a. How was the information for Table 1 collected? Was it self-report on a form? Or were participants asked in the focus group interviews?

Response: A statement to reflect how the socio-demographic information was collected has been included (line 250-251)

b. There are a lot of brilliant quotes. However, having so many disrupts the flow for the reader. As many of the quotes are already summarized in the sentence before it, and therefore the quotes don’t add anything extra to that point, I suggest removing the quotes on the following lines:

i. Line 281

ii. Lines 287-288

iii. Lines 293-294

iv. Line 300

v. Lines 327-328

vi. Lines 360-362

vii. Line 393 (and instead add the word “reminders” to the sentence “…husbands in decision making and reminders regarding vaccination...”).

viii. Line 398

ix. Lines 403-404

Response: Thank you for this highlight. The highlighted lines have been reformatted and some deleted to ensure the flow of results is not disrupted.

c. Similarly, to help the flow of reading for the reader, I think the results in section 3.3 should be reformatted, to include all the positive comments or comments about convenience at the beginning, followed by all of the negative comments or comments about inconvenience at the end. It is currently mixed.

Response: Thank you for the guidance. This section has also been reformatted to begin with positive comment and then followed by negative comments while ensuring coherence. This can be seen in results section line 349-406

d. Lines 416-421. This is a striking result. I think the authors could make this section clearer, however. Furthermore, I understand that polygamy is legal in Uganda; when the participant on line 420 says “One says I will not go….” is this one of her husbands?

Response: Thank you. This was a statement about some husbands but not ‘one of her husbands’. Concerns were with the dress code for both pregnant women and their husbands. This is largely a Muslim community (53.3%) and polygamy is acceptable.

4. Discussion

a. There are a lot of bold statements in the discussion, that haven’t been referenced. Please either reword or find references. Some examples of unreferenced bold statements:

i. Lines 448-449: “For example, a woman who gets vaccinated and later develops a disease like malaria may fail to seek for future vaccination.”

Response: Thank you for this comment. This has been altered to reflect a scenario and read thus; “…..a woman who gets vaccinated with a specific maternal vaccine may hold high expectations which include treatment of other diseases and when she later develops diseases like malaria that needs treatment, she may fail to seek for future vaccination and resort to local remedies.” This is in the discussion section line 521-524.

ii. Lines 453-454: “With decreased perceived risk of immune-preventable diseases, fear for AEFI increases which may reduce compliance with vaccination.”

Response: Reference to this assertion has been provided. This is in the discussion section line 529.

iii. Lines 457 – 459: “Pregnant women generally have trust and high expectations in the safety of maternal vaccines. Women are emotionally attached to their pregnancies and highly consider the wellbeing of their child….”

Response: Thank you for this. Statements have been rephrased and referenced using literature available as recommended. This is in the discussion section line 532-534.

b. I’d be interested in reading about the abusive behaviour some health care workers have towards pregnant women. Do other LMIC countries experience this? Given a health care providers recommendation is one of the most important facilitators of vaccination, what’s the impact of the abusive behaviour on uptake? It would also be worthwhile noting that while health care workers should receive training on using consistent messaging (Lines 551-552), some appear to need training their behaviour and bedside manners.

Response: Thank you for this helpful observation. We added something about on the behaviour of health workers towards pregnant women in the discussion. We have also referenced a study in LMICs where this was experienced. Impact of healthcare behaviour on uptake (earlier suggested) gave good insights on this and it has been used. The recommendation of training on consistent messaging has been beefed up with recommendation -very helpful observation. This is in the discussion section lines 581-588 and lines 590-596.

c. I’d also be interested in reading about the impact of husbands on maternal vaccination. For example, the shaming husbands do of their wives’ appearances and clothes. Has this been documented anywhere else in the literature? Given husbands were also important in decision-making, how does this work in polygamous relationships? Finally, given that some women weren’t able to access health clinics as their husband would not accompany them, is home vaccination an achievable, acceptable and safe option for women in Uganda? Are there any other health services delivered in the home?

Response: More details about dress code and husbands’ failure to come for ANC because of shame, embarrassment and shyness have been discussed with supporting literature from an African Context. Given that majority of the participants in the study as well as Iganga district are Muslims- polygamy was a very important fact that was recommended. A statement showing how polygamous men may fail to attend ANC for fear of being perceived as favoring one wife over others, that is also conflict in the household was highlighted. A statement acknowledging that home vaccinations feasibility for pregnant women has been included. Other options like using VHT, mobile clinics and consultations have been suggested for application. This is in the discussion section lines 604-610 and lines 613-616.

d. To me, there was also a theme about cleanliness/dirtiness. Some health workers abused patients if they were dirty, some women reported on dirty toilets at clinics, and some women said their husbands wouldn’t go with them to the clinic as the women were dirty. Further discussion about this, with potential solutions if there are any, would be interesting.

Response: Thank you. Cleanliness/dirtiness could have been a theme, authors thought that since it appeared under different themes of research question.ie. Experiences of pregnant women, and partner’s involvement in decision making; it would therefore be affect themes if it were to be treated separately. For example partner’s role in buying dresses for pregnant women. Also this applies to what pregnant women and their friends have experienced while at the health facilities. Further discussion on this has been made as recommended. This is in the discussion section lines 590-596.

e. Safety surveillance: whilst this important, I’m not sure whether this is the first strategy that should be implemented. It’s also costly and will take time to implement. Consider other more-immediate interventions that may help these women. Some guidance in these papers:

i. Krishnaswamy S, Lambach P, Giles ML. Key considerations for successful implementation of maternal immunization programs in low and middle income countries. Human vaccines & immunotherapeutics. 2019 Apr 3;15(4):942-50.

ii. Ellingson MK, Dudley MZ, Limaye RJ, Salmon DA, O’Leary ST, Omer SB. Enhancing uptake of influenza maternal vaccine. Expert review of vaccines. 2019 Feb 1;18(2):191-204.

Response: The suggested articles have been helpful in identifying more interventions for recommendation that directly point to the findings of the study. These among others ongoing training health care professionals, incorporating vaccination into maternity care, strengthening antenatal care and surveillance systems. This is in the discussion section lines 649-667.

MINOR COMMENTS:

5. Title

a. The title should be revised. The word “determinants” is usually reserved for studies that have utilised quantitative methods.

Response: This has been revised to “Vaccines safety and maternal knowledge can boost maternal immunization acceptability in rural Uganda – A Qualitative Study Approach.” This is in the introduction section lines 1-2.

6. Article summary

a. Line 56: Is this about women in Uganda? And about maternal immunisation?

Response: This has been corrected to show reflect “…women in Uganda are generally knowledgeable about maternal immunization.” This is in the article summary section lines 62-63.

7. Key words

a. Suggest using more specific MeSH terms, such as “Health Knowledge, Attitudes, Practice” and a term to describe Uganda

Response: Thank you. Key words have been used as recommended and tested in the PubMed search engine to ensure that they are MeSH terms as recommended. This can be seen in introduction section, lines 49-51.

8. Introduction

a. Some of the sentences are quite long (e.g. lines 69-72). Consider shortening

Response: Thank you for pointing this out. The sentence has been shortened. This can be seen in introduction section, lines 77-80.

b. It’s important that the references used directly relate to the topic. For example, line 71 discusses tetanus, but reference #2 is not about tetanus\\

Response: Thank you for highlighting this. Reference 2 and 3 have been removed to replace relevant references that directly relate to what authors were communicating. This can be seen in introduction section, lines 80-81.

c. Line 86: How was 40% update for TT2+ estimated? What data was collected/used? Is it a reliable estimate?

Response: The statistic has been rectified to reflect the National coverage among pregnant women at only 49% in 2011. Data used by Ministry of Health (UNEPI program) is generated from District Health Information System (DHIS) that is periodically updated by district biostaticians as aggregated data. Quality may vary depending on who enters it and the completeness. We believe that it can at least provide an estimate reliable. This can be seen in introduction section, lines 94-96.

d. I suggest using systematic reviews as much as possible in the introduction. For example, the following systematic review should be referenced:

i. Nunes MC, Madhi SA. Influenza vaccination during pregnancy for prevention of influenza confirmed illness in the infants: a systematic review and meta-analysis. Human vaccines & immunotherapeutics. 2018 Mar 4;14(3):758-66.

Response: Systematic reviews have been replaced wherever possible that they exist and communicate the similar knowledge. This can be seen in introduction section, lines 80, 81, 88, 100, and 101.

9. Methods

a. When was the study carried out and how long did it go for? It would be worthwhile adding the year/s and duration into the ‘research method’ section

Response: A phrase to show the period and duration has been added as “for a period of 2 months between June 2019 and July 2019.” This can be seen in introduction section, line 162.

b. Participant recruitment and data collection:

i. As the reader, it would be clearer to move lines 157-162 to line 153, after “interviews at both the community and health facility.” This will help the reader understand how the research team purposively selected participants

Response: Thank you. As recommended, to maintain the flow of explanation of how purposive sampling was done, lines 157-162 have been moved to line 153.

10. Results

a. Table 1:

i. Given the numbers are <100, it is advisable to round the % to the nearest whole number

Response: Thank you. The percentages in the table have been rounded off to the nearest whole number as per recommendation. This can be seen in the results section lines 259-260.

ii. The total number in religion does not equal 90

Response: The error has been rectified to reflect 16 catholic women participating in the study. This can be seen in the results section line 259.

iii. A space is needed between the numbers and brackets

Response: This has been done for all numbers as recommended. This can be seen in the results section lines 259-260.

iv. Please spell out what TT means (underneath the table)

Response: The abbreviation for TT has been spelt out be underneath the table. This can be seen in the results section line 259.

b. Knowledge about maternal vaccines and immunisation:

i. Please clarify whether this sentence “Many were able to mention that vaccination prevents mothers and children from diseases like tetanus, measles, etc” is referring only to vaccination during pregnancy, or vaccination of people in general?

Response: This has been clarified to reflect vaccination during pregnancy. Note that this applied to both scenarios and it has been rectified to reflect so. This is reflected in results section lines 264-266.

c. Lines 357-358. I think the authors could expand on this and define what they mean by “sensitization.”

Response: Clarification has been provided on what sensitization they meant or required before taking up the new vaccine including; knowing the disease the vaccine prevents, schedule, when to receive it and its safety to both themselves and their unborn babies. This is reflected in results section lines 416-418.

d. Line 383: I suggest removing the Ugandan President’s name, and just refer to them as the President of Uganda. I.e., you would write “we are prepared but the problem is that they tell us that [The President of Uganda] wants to test the drugs on us….”

Response: This has been edited to remove Ugandan President’s name and maintain “[The President of Uganda]”. This can be seen in results section lines 446-447.

e. Lines 409-410: This quote doesn’t relate to the sentence above it. Consider using another quote.

Response: The section has been edited to make more sense for which the quote was intended. This can be seen in results section lines 475-478.

f. Line 421: Should “rugs” be “rags”?

Response: Thank you. This has been rectified. This can be seen in results section line 490.

11. Discussion

a. Lines 439-440: distinction is needed as to whether participants are talking about vaccination prior to pregnancy, or whether pregnant women think they haven’t yet been vaccinated against hepatitis B or HPV in their pregnancy?

Response: Thank you for pointing this out. A statement has been added to include"…. during their pregnancy while attending ANC.” This is because pregnant women were referring to vaccine received during the period when they confirm that they are pregnant and hence getting it at ANC. This can be seen in the discussion section lines 510-511.

b. Line 442: suggest using the word “prime” here instead of “encourage”

Response: Thank you. This has been used as per recommendation. This can be seen in the discussion section line 514.

c. Line 453: please reword “immune” to “vaccine.”

Response: Thank you. The word vaccine has be used instead of immune as advised. This can be seen in the discussion section line 528.

Reviewer #2 Point by Point Response to Review of manuscript for PLOS ONE

Summary: This is a well done manuscript. The title, background, findings, and discussion are very well laid out. Methods need some clarity for reproducibility. Just a few suggestions to make it a little more crisp:

Comments on

Title: No comment

Abstract:

Lines 33 & 34: You need to recast this sentence. “Women expressed willingness to take new vaccines, positive attitudes towards maternal immunization, and were familiar with its importance”. Recast the sentence to follow the order in your objectives namely knowledge, attitudes and willingness. For example: “Women were familiar with the importance of maternal vaccines, have positive attitudes and expressed willingness to take them”.

Response: Thank you. The statement has been edited as advised to reflect a better flow and coherent of events being discussed. This can be seen in abstract section on lines 32-35.

Line 35: “……... affected by adverse events”, ie changing the effects to events. Also recast the statement to be more sharp and crisp. Such as “………. affected by worries of pregnant women and that of their partners’ who influence health seeking decisions in a home concerning adverse events following the maternal immunization.”

Response: Thank you. The statement has been revised as recommended to reproduce the recommendation. This can be seen in abstract section on lines 35-37.

Line 36-38: “Misconceptions about introduction of vaccines like thinking that vaccines will be tested on only them before introduction in larger population, and that vaccines treat illnesses like malaria and general body weakness.” Consider this phrase “ …… of vaccines such as the belief that vaccines treat malaria and general body weakness and that of being used as guinea-pig to test for the vaccine before its introduction to the larger population.”

Response: Thank you. This line has been rephrased as per recommendation of the reviewer. This can be seen in abstract section on lines 39-42.

Background:

Line 77: It is World Health Organization and not “world ….”

Response: Thank you. This has been corrected. This can be seen in introduction section on line 85.

Line 80: “………. are administered to pregnant women.”

Response: Thank you. This has also been corrected. This can be seen in introduction section on line 90.

Line 82: Do you mean that poor neonatal health outcomes are due to lack of studies on knowledge ………. Make it clearer.

Response: Thank you. The sentence was separated and made clearer to bring out the fact that while evidence is limited, poor neonatal health outcomes continue to happen. This can be seen in introduction section on lines 92-94.

Line 87: Be consistent. “ Immunisation” is British English. You have been using American English. In addition, there is a little flaw in the content and mechanical accuracy in that sentence. You could consider “This can partly be attributed to limited knowledge among pregnant women, their poor attitude about immunization, their failure to attend all ANC visits, lack of training of the Village Health Teams (VHTs) on the importance of TT vaccination for pregnant mothers and limited health education to pregnant mothers.”

Response: Thank you. Immunisation had been corrected to Immunization. See line 97. The mistake has been rectified using the recommendation. See lines 96-100.

Line 92: “ ………. middle-income countries in respect of Pneumococcal Conjugate Vaccine ……….. “

Response: Thank you. This has been used to rectify the mistake highlighted in line 92. This can be seen on line 109.

Line 95: GAVI means Global Alliance for Vaccines and Immunizations.

Response: Thank you. Mistake on how GAVI was written has been corrected using the recommendation. This can be seen on line 111.

Methods: This section need some work.

Line 144: You had included health workers in the research population included. You failed to include them now.

Response: These have also now been included in the research population as earlier stated and in the recommendation. This can be seen on lines 169-170.

Line 153: Which of the population had FGD and which one had KII. You need to be coherent and orderly.

Response: Thank you. Clarification has been provided that FGD were done among pregnant women and KII were done among health care workers. Statement have been arranged to ensure coherence as well. This can be seen on lines 176-177.

Line 157: Readers may find it difficult to understand what you mean. I think you may look at it again and recast it to bring out your points clearly.

Response: Thank you. Line 157 has been edited to ensure clarity in communication. Statement was too long to follow. It has been split into two and can easily be understood now. It says “…….all pregnant women available at ANC and maternity points of care in June and July 2019 at the visited health facilities in Iganga. During the same period, pregnant women in the communities were identified and invited by the VHTs for FGDs. This can be seen on lines 177-183.

Line 165: Order and sequence is important as mentioned in previous comment.

Response: Thank you. This has been rectified to ensure order and coherence when one is reading. This can be seen on lines 190-191.

Line 174: Pointless mentioning names of those that played a role here.

Response: Thank you. We felt that for transparency reasons, the names and role played be left in the manuscript as we have observed in other similar papers. This can be seen on lines 192-193.

Results:

Line 194: “(2 FGDs pregnant women and 2 health workers) could read “(2 FGDs for pregnant women and 2 KIIs for 2 health workers)”, or what exactly, do you have in mind.

Response: Thank you. Statement was rectified to read as “….(2 FGDs for pregnant women and 2 KIIs for 2 health workers) to evaluate the questions for their cultural appropriateness to the target population.” This can be seen on lines 234-235.

Line 208: Change the FDG to FGD. Where exactly is the study area; rural or urban or rural and semi-urban? Be consistent.

Response: Thank you. FDG has been changed to FGD. A study area is in rural and semi-urban and this has been made consistent throughout. This can be seen on lines 248 and 252.

Line 239: You use either “reason” or “why”.

Response: Thank you. The word “reason” has been removed to remain with “why”. This can be seen on line 282.

Line 250: I could have preferred “….one woman added” than the word chipped in. This is scientific writing.

Response: Thank you. The phrase “chipped in” has been replaced with “one woman added” as recommended. This can be seen on line 293.

Line 264: AEFI means adverse events following immunization. It refers to any untoward medical occurrence which follows immunization and which does not necessarily have a causal relationship with the usage of the vaccine.

Response: Thank you. This has been noted and consistency of using AEFI has been considered. This can be seen on lines 307-308.

Line 283: could read “ …… highlighted that some of ……”

Response: Thank you for the suggestion. This has also been rectified using the recommendation. This can be seen on line 326.

Line 290: “Participants also expressed that some pregnant women did not go for vaccination due to their prohibitive religious practice like some Pentecostal churches”, could read “Participants …….. due to their religious belief that prohibites vaccination”.

Response: Thank you. This has been rectified using the recommendation. This can be seen on lines 333-335.

Line 296: This statement “Some mentioned the fear for injections and HIV testing (which is compulsory for all women attending ANC) would be the reason why some women do not seek maternal vaccination” could read “Fear of injections and HIV testing could be the reason some women fail to seek maternal vaccination.”

Response: Thank you. This has been rectified using the recommendation. This can be seen on lines 340-341.

Line 369: “When health workers were asked what women are worried about, only one mentioned AE worries from the pregnant women and their partners” could read “When health workers were asked what women are worried about, only one mentioned that the pregnant women and their partners were concerned about AEFI.”

Response: Thank you. This has been rectified using the recommendation. This can be seen on lines 429-430.

Line 375: The statement could be rephrased thus “Some participants believe that they were used to test for the safety of new vaccines and thus they would not take the vaccines until its safety is confirmed by others who had received it.

Response: Thank you. This has been rectified using the recommendation. This can be seen on lines 435-438.

Line 389: Could be rephrased as “Pregnant women …………. vaccination even without accompanying them and their children to immunization centers.”

Response: Thank you. This has been rectified using the recommendation. This can be seen on lines 452-454.

Line 400: You may want to rephrase thus “Health workers cited that they encouraged pregnant women to come with their partners for ANC visits.”

Response: Thank you. This has been rectified using the recommendation. This can be seen on lines 464-465.

Line 417: “…………. not effective since women are not comfortable with moving with husbands and more so their husbands don’t dress well.”

Response: Thank you. This has been rectified using the recommendation. This can be seen on lines 484-487.

Discussion:

Line 434: be consistent with the study area.

Response: Thank you. The study area has been made the same as earlier suggested. This can be seen on line 503.

Line 452: change adverse effect to adverse event

Response: Thank you. Adverse effect has been changed to adverse event. This can be seen on lines 527-528.

Line 475: Rephrase as “…………... and religious practices found in some Pentecostal churches, that prohibite maternal vaccination.

Response: Thank you. This has been rectified using the recommendation. This can be seen on lines 551-552.

Line 482: Rephrase the statement for clarity

Response: Thank you. This has been rectified using the earlier recommendation on AEFI and also more sensitization has been added. This can be seen on line 558.

Line 486: Rephrase the statement. It could read “Some believe that the new vaccines …………...”

Response: Thank you. This has been rectified using the recommendation. This can be seen on lines 562-563.

Line 502: delete treatment from the sentence.

Response: Thank you. The word “treatment” has been deleted from the sentence. This can be seen on line 562.

Line 504: You can rephrase as “The attitudes and behaviors of health care providers towards pregnant women is an …….”

Response: Thank you. This has been rephrased using the recommendation. This can be seen on line 579.

Line 517: Consider rephrasing thus, “……… get vaccinated for their good and that of their children”.

Response: Thank you. This has been rephrased using the recommendation. This can be seen on line 583-584.

Line 518: Consider this rephrasing “The partner’s worries about AEFI was an important concern for women ………….”

Response: Thank you. This has been rephrased using the recommendation.

Line 537: See the comment on line 34

Response: Thank you. Adjustment have been made to ensure order and coherence while writing as per the research question. This can be seen on line 610.

Line 538: Define ADR. Do you mean Adverse Drug Reaction? Since we are talking of immunization why not use AEFI instead.

Response: Thank you. This has been corrected to AEFI. This can be seen on line 618.

Attachment

Submitted filename: Response to Reviewers.docx

Decision Letter 1

Holly Seale

30 Oct 2020

PONE-D-20-15557R1

Vaccines safety and maternal knowledge for enhanced maternal immunization acceptability in rural Uganda – A Qualitative Study Approach.

PLOS ONE

Dear Dr. Kajungu,

Thank you for submitting your manuscript to PLOS ONE. After careful consideration, we feel that it has merit but does not fully meet PLOS ONE’s publication criteria as it currently stands. Therefore, we invite you to submit a revised version of the manuscript that addresses the points raised during the review process.

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We look forward to receiving your revised manuscript.

Kind regards,

Holly Seale

Academic Editor

PLOS ONE

[Note: HTML markup is below. Please do not edit.]

Reviewers' comments:

Reviewer's Responses to Questions

Comments to the Author

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Reviewer #2: All comments have been addressed

**********

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Reviewer #2: Yes

**********

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Reviewer #2: Yes

**********

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Reviewer #2: Yes

**********

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Reviewer #2: No

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Reviewer #2: Good job. You just need to re-read the article painstakingly for few grammatical errors, most of which I have pointed out. See the attachment.

**********

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Reviewer #2: Yes: Dr Uchechukwu Joel Okenwa

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Attachment

Submitted filename: Review2_Maternal Immunization Acceptability Manuscript.docx

PLoS One. 2020 Dec 10;15(12):e0243834. doi: 10.1371/journal.pone.0243834.r004

Author response to Decision Letter 1


18 Nov 2020

Reviewer #2: Good job. You just need to re-read the article painstakingly for few grammatical errors, most of which I have pointed out. See the attachment

Response: Thank you very much for the guidance and pointing out the grammatical errors. We have reviewed the manuscript, corrected the errors, clarified where necessary and improved the flow of the manuscript.

Editor's comment:

1) Please ensure that you refer to Table 2 in your text as, if accepted, production will need this reference to link the reader to the Table.

Response: Table2 was added to the manuscript by mistake. The information is referenced as SI File 3 in the results section

Attachment

Submitted filename: Response to Reviewer 2.docx

Decision Letter 2

Holly Seale

27 Nov 2020

Vaccines safety and maternal knowledge for enhanced maternal immunization acceptability in rural Uganda – A Qualitative Study Approach.

PONE-D-20-15557R2

Dear Dr. Kajungu,

We’re pleased to inform you that your manuscript has been judged scientifically suitable for publication and will be formally accepted for publication once it meets all outstanding technical requirements.

Within one week, you’ll receive an e-mail detailing the required amendments. When these have been addressed, you’ll receive a formal acceptance letter and your manuscript will be scheduled for publication.

An invoice for payment will follow shortly after the formal acceptance. To ensure an efficient process, please log into Editorial Manager at http://www.editorialmanager.com/pone/, click the 'Update My Information' link at the top of the page, and double check that your user information is up-to-date. If you have any billing related questions, please contact our Author Billing department directly at authorbilling@plos.org.

If your institution or institutions have a press office, please notify them about your upcoming paper to help maximize its impact. If they’ll be preparing press materials, please inform our press team as soon as possible -- no later than 48 hours after receiving the formal acceptance. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org.

Kind regards,

Holly Seale

Academic Editor

PLOS ONE

Additional Editor Comments (optional):

Reviewers' comments:

Acceptance letter

Holly Seale

2 Dec 2020

PONE-D-20-15557R2

Vaccines safety and maternal knowledge for enhanced maternal immunization acceptability in rural Uganda – A Qualitative Study Approach.

Dear Dr. Kajungu:

I'm pleased to inform you that your manuscript has been deemed suitable for publication in PLOS ONE. Congratulations! Your manuscript is now with our production department.

If your institution or institutions have a press office, please let them know about your upcoming paper now to help maximize its impact. If they'll be preparing press materials, please inform our press team within the next 48 hours. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information please contact onepress@plos.org.

If we can help with anything else, please email us at plosone@plos.org.

Thank you for submitting your work to PLOS ONE and supporting open access.

Kind regards,

PLOS ONE Editorial Office Staff

on behalf of

Dr. Holly Seale

Academic Editor

PLOS ONE

Associated Data

    This section collects any data citations, data availability statements, or supplementary materials included in this article.

    Supplementary Materials

    S1 File. Focus group discussion guide.

    (PDF)

    S2 File. Key informant interview guide.

    (PDF)

    S3 File. Thematic classification of additional quotes.

    (PDF)

    S4 File. COREQ checlist.

    (PDF)

    S5 File. Analysis codebook.

    (PDF)

    Attachment

    Submitted filename: Review of manuscript on maternal immunization.docx

    Attachment

    Submitted filename: Response to Reviewers.docx

    Attachment

    Submitted filename: Review2_Maternal Immunization Acceptability Manuscript.docx

    Attachment

    Submitted filename: Response to Reviewer 2.docx

    Data Availability Statement

    All relevant data are within the manuscript and its Supporting Information files.


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