Abstract
Introduction:
HIV prevalence among transgender women is high worldwide. The objectives of the present study are to estimate the current prevalence of HIV and identify factors associated with high HIV burden among transgender women in Paraguay.
Methods:
Transgender women aged 15 years or older in four regions of Paraguay were recruited by Starfish Sampling between February and March 2021.
Results:
322 transgender women were included. Mean age was 31 years (range 15-67), with 102 tested HIV positive (31.7%, 95% confidence interval [CI] 26.6-37.1). In multivariable analysis, factors associated with HIV infection were age at first intercourse ≤17 years old (aOR 5.47, 95% CI 1.05-28.42), >10 years difference in age with the last sexual partner (aOR 1.60, 95% CI 1.04-2.46), substance use (mostly cocaine) (aOR 3.00, 95% CI 1.47-6.12), higher risk perception (aOR 3.08, 95% CI 1.53-6.17), not testing for HIV (aOR 1.23, 95% CI 1.09-1.39), and accessed by a peer educator (aOR 3.86, 95% CI 1.77-8.38).
Conclusions:
Sexual debut as a minor and a large age difference with sexual partners are associated with high burden of HIV among transgender women in Paraguay. Our study corroborates the finding of cocaine use during sex as a risk factor for HIV. Prevention programs must address structural and social vulnerabilities to stem the tragically high burden of HIV among transgender women.
Keywords: transgender persons, HIV, cocaine, sexual behavior, Paraguay
Introduction
Transgender women worldwide are severely affected by HIV and other sexually transmitted infections (STIs) (1-2). HIV prevalence among transgender women documented from multiple countries indicates that this population may be experiencing the greatest burden of HIV of any population (3-4).
According to UNAIDS, an estimated 2.2 million (1.5 million-2.8 million) people were living with HIV in Latin America by the end of 2021, including an estimated 15,700 (14,000-18,000) adults aged 15 years and over in Paraguay (5). In a survey of transgender women in Paraguay conducted in 2017 (4), the prevalence of HIV was 24.8% (95% confidence interval [CI] 18.5-31.2), similar to other countries in the Latin American and Caribbean regions, including Jamaica (25.2%) (6), Argentina (34.1%) (7), and Brazil (31.2%) (8), and above that estimated for the world as a whole (19.1%) (1). Globally, risk factors associated with HIV found in studies of transgender women include sex work, poverty, unprotected receptive anal intercourse, multiple casual partners, substance use, a history of STIs (9-11).
The objective of the present study was to estimate the current prevalence of HIV among transgender women in Paraguay to assess the trajectory of the epidemic in this severely affected population and to characterize factors associated with high HIV burden among transgender women in 2021.
Methods
Study design and setting
We conducted a cross-sectional survey to determine the prevalence of HIV in transgender women in four regions of Paraguay (Asunción, Central, Alto Paraná, and Cordillera) from February to March 2021. These regions were selected from a total of eighteen in the country because they were physically accessible and include the majority of the population of Paraguay, many of its major urban areas, and the national capital.
Study population
The study population was adult and young people who were assigned male sex at birth and who identified as female or transgender. The definition did not require modifying characteristics of their body or clothing or an assessment of their gender presentation at the time of the survey. To be eligible, participants had to be at least 15 years of age and living or working in Asunción, Central, Alto Paraná, and Cordillera.
Exclusion criteria
People who did not understand the information provided concerning the study due to intoxication or mental illness.
Sampling
Participants were recruited through Starfish Sampling, which combines the venue-based recruitment methods of time-location sampling (TLS) (12) with the peer-referral respondent-driven sampling (RDS) (13) as described in greater detail by Raymond et al (14). The methods replicated the previous survey of transgender women conducted in Paraguay in 2017 (4). A sample size calculation of 300 was determined based on estimating HIV prevalence within +/−5% over a wide range of point estimates around the prevalence found in 2017 (4). Sampling stopped after this target was exceeded.
Measurements
A face-to-face structured survey instrument was used to collect information from participants in the following domains: sociodemographic characteristics, sexual history, substance use, knowledge of HIV prevention, perception of risk, and HIV testing. Before the implementation of the survey, a pilot test of the data collection instrument was carried out with 10 people from the transgender population to improve understandability and terminology, resolve misinterpretations or apparent contradictions, and to improve the comfort of the interviewers and respondents. In particular, questions were rephrased in lay rather than medical terms, questions on behaviors with different partners were dropped to shortened the time to complete the survey, and the order of questions was re-arranged for better flow from less sensitive to more sensitive topics.
Laboratory methods
Once the survey concluded, consent was obtained for the collection of serological samples for HIV testing. For the diagnosis of HIV, an algorithm of rapid sequential tests was used. If the first test for HIV (high sensitivity) had a reactive result, a second test (higher specificity) was done to confirm the result. Tests were approved by national protocols, namely HIV-1/2 STAT Pak Assay (Chembio Diagnostic Systems, NY, USA) and SD BIOLINE HIV-1/2 3.0 (Standard Diagnostics, Inc., Korea). The national reference laboratory performed ELISA tests for HIV on all samples with discordant sequential rapid test results to establish the diagnosis. ELISA was also performed on 20% of the samples with a non-reactive result on the rapid test and on all reactive samples for quality control. Disclosure of results of confirmatory tests and follow-up for care were carried out through the local Comprehensive Care Services in each region.
Statistical methods
Descriptive statistics are shown as point estimates with 95% confidence intervals (CIs) or as a mean and median for number of sex partners. Bivariate logistic regression analysis estimated odds ratios (OR) for associations between HIV infection and demographic and behavioral variables. Variables associated with HIV at p<0.05 in bivariable logistic regression analyses were entered into a multivariable logistic regression model. Variables with p< 0.05 were retained in the final multivariable model. Analyses were done using Stata SE 16.0.
Ethical considerations
The study protocol was approved by the Ethics Committee of the Central Laboratory of Public Health of Paraguay, according to ethical principles and guidelines for the protection of human subjects of biomedical and behavioral research (15). All participants provided verbal informed consent; minors were deemed emancipated and consented for their participation. The survey was conducted anonymously to protect participants’ privacy and identity.
Results
A total of 322 transgender women were surveyed, distributed in four regions: 158 (49.0%) in Central, 130 (40.4%) in Asunción, 29 (9.0%) in Alto Paraná, and 5 (1.6%) Cordillera (Table 1). Most (96.4%) self-identified as transgender or trans women; only 1.6% identified as female. Over one-fourth (27.6%) were youth aged 15 to 24 years. Most (90.9%) were employed, and a majority (58.8%) also reported engaging in sex work in the last year. The mean age of first sexual intercourse was 13.9 years (95% CI 13.5-14.2). An age difference of ten or more years with their most recent partner was reported by 15.1%. The most commonly reported illicit substance was cocaine, used by 30.5% of respondents in the last twelve months. Over one-third (40%) of transgender women perceived their risk for HIV to be higher than that of their peers. Over half (52.5%) had been accessed by a peer educator in the last 12 months. Most (93.8%) had tested for HIV in their lifetime, half (50.0%) had tested for HIV in the last 12 months. A total of 102 transgender women tested positive for HIV in the survey yielding a prevalence of 31.7% (95% CI 26.6-37.1).
Table 1.
Socio-demographic characteristics, drug use, sexual behaviors, and HIV prevalence among transgender women, Paraguay, 2021 (N=322).
Characteristics | N (%) | 95% confidence interval |
---|---|---|
Residence (department) | ||
Central | 158 (49.0) | 43.4-54.6 |
Asunción | 130 (40.4) | 34.9-45.9 |
Alto Paraná | 29 (9.0) | 6.1-12.6 |
Cordillera | 5 (1.6) | 0.5-3.5 |
Gender identity | ||
Transgender, trans women | 3317 (98.4) | 996.4-99.5 |
Female | 5 (1.6) | 0.5-3.6 |
Age group, years | ||
15 -19 | 23 (7.1) | 4.5-10.5 |
20 -24 | 66 (20.5) | 16.2-25.3 |
25-29 | 68 (21.1) | 16.7-25.9 |
30-34 | 47 (14.7) | 10.9-18.9 |
35-39 | 48 (14.9) | 11.2-19.2 |
40 and above | 70 (21.7) | 17.3-26.6 |
Highest educational level completed | ||
Primary, incomplete | 62 (19.4) | 15.1-24.1 |
Primary, complete | 44 (13.8) | 10.1-18.0 |
Secondary, incomplete | 86 (26.9) | 22.1-32.1 |
Secondary, complete | 96 (30.0) | 25.0-35.3 |
Vocational training, incomplete | 3 (0.9) | 0.2-2.7 |
Vocational training, complete | 3 (0.9) | 0.2-2.7 |
University, incomplete | 17 (5.3) | 3.1-8.3 |
University, complete | 9 (2.8) | 1.3-5.2 |
Employment status | ||
Employed | 291 (90.9) | 87.2-93.8 |
Unemployed | 29 (9.1) | 6.1-12.7 |
Engaged in sex work in last year | ||
Yes | 187 (58.8) | 53.1-64.2 |
No | 131 (41.2) | 35.7-46.8 |
Income per month | ||
Poverty line and below ($326 USD) | 31 (17.7) | 12.3-24.2 |
More than $326 | 144 (82.3) | 75.8-87.6 |
Living situation | ||
Family | 118 (36.7) | 31.3-42.1 |
In couple | 36 (11.2) | 7.9-15.1 |
Alone | 81 (25.2) | 20.5-30.2 |
Penal, detention | 17 (5.3) | 3.1-8.3 |
Other | 70 (21.6) | 17.3-26.6 |
Housing situation | ||
Own | 91 (28.3) | 23.4-33.5 |
Rental | 85 (26.4) | 21.6-31.5 |
Family home | 119 (37) | 31.6-42.5 |
No answer | 27 (8.3) | 5.6-11.9 |
Age at first intercourse (years old) | 13.9 (mean) | 13.5-14.2 |
Age difference with the last sexual partner | ||
≤10 years apart | 265 (84.9) | 80.5-88.7 |
>10 years apart | 47 (15.1) | 11.3-19.5 |
Stable partner, last six months | 93 (28.9) | 24.1-34.3 |
Casual partner, last six months | 212 (66.7) | 61.2-71.8 |
Mean number of casual partners, last six months (of 210 respondents with casual partners) | 4.9 | 4.2-5.6 |
Median number of casual partners, last six months (interquartile range) | 3 | 2-6 |
Always using condoms, last six months | 131 (42.8) | 37.2-48.5 |
Substance use last twelve months | ||
Alcohol | 115 (36.4) | 31.1-41.9 |
Marijuana | 71 (22.5) | 17.9-27.5 |
Cocaine | 96 (30.5) | 25.4-35.9 |
Sedatives, sleeping pills | 7 (2.2) | 0.9-4.5 |
Volatile inhalants, poppers, glue | 0 | -- |
Ecstasy or other designer drugs | 1 (0.3) | 0.01-1.7 |
Hallucinogens (LSD, mescaline, mushrooms) | 4 (1.3) | 0.3-3.2 |
Crack | 32 (10.2) | 7.0-14.0 |
Amphetamines | 3 (1.0) | 0.2-2.7 |
History of sexually transmitted disease (STD), lifetime | 23 (7.1) | 4.6-10.5 |
Knows where to get a free condom | 285 (90.0) | 85.7-92.7 |
Perceived their risk for HIV higher than their peers | 111 (40.0) | 34.1-45.9 |
Accessed by a peer educator, last 12 months | 167 (52.5) | 46.8-58.1 |
Received a condom from an HIV prevention program, last 12 months | 267 (85.9) | 81.4-89.5 |
Tested for HIV ever | 301 (93.8) | 90.5-96.1 |
Tested for HIV, last 12 months | 151 (50.0) | 44.0-55.6 |
HIV-positive (current test) | 102 (31.7) | 26.6-37.1 |
N=175 respondents. Some categories do not add up to total due to missing responses (n<5 unless indicated).
HIV prevalence and bivariate comparisons by characteristics are shown in Table 2. Transgender women in Central department had the highest prevalence of HIV (37.9%), which was significantly higher than the capital department of Asunción (23.7%, p=0.008). HIV prevalence increased with increasing age, reaching 47.5% among transgender women aged 35 years and older. HIV prevalence was higher among transgender women with markers of higher socio-economic status, including being employed (33.7%) and owning (37.4%) or renting (38.8%) their home (vs. living with family at 20.2%, p=0.005 and 0.003, respectively). Transgender women reporting their first intercourse as a minor (≤17 years) had significantly higher HIV prevalence (33.4%) than those with first sex age 18 years and older (16.1%, p=0.049). Transgender women reporting that their most recent sexual partner was 10 or more years older also had significantly higher HIV prevalence than those whose last partner was within 10 years of their own age (51.0% vs. 27.5%, respectively, p=0.001). HIV prevalence was higher among trans women using alcohol (40.9%, p=0.010) and cocaine (46.9%, p<0.001) compared to non-users. Several indicators of access to prevention programs were associated with higher HIV prevalence, including higher perception of their risk for HIV (32.4%), higher knowledge of HIV transmission (36.2%), always using condoms (38.9%), not testing for HIV in the last 12 months (46.7%), receiving a condom from a prevention program (35.6%), knowing where to get a free condom (35.1%), and being accessed by a peer educator (38.9%). Of note, no associations were found between HIV prevalence and engaging in sex work or history of sexually transmitted disease (STD).
Table 2.
HIV prevalence by demographic characteristics and risk behaviors, transgender women, Paraguay 2021 (N=312).
Characteristics | HIV prevalence, n (%) | OR (95% CI) | p-value |
---|---|---|---|
Residence (department) | |||
Central | 60 (37.9) | 1.97 (1.17-3.31) | 0.008 |
Asunción | 32 (23.7) | Ref. | -- |
Alto Paraná | 10 (34.5) | 1.69 (0.71-4.04) | 0.229 |
Cordillera1 | −0 (0-0.5) | -- | -- |
Age group, years | |||
15-24 | 11 (12.4) | Ref. | -- |
25-34 | 35 (30.4) | 3.10 (1.44-6.67) | 0.002 |
35 and more | 56 (47.5) | 6.40 (2.92-14.04) | <0.001 |
Educational level | |||
No school or up to high school | 36 (33.9) | 1.16 (0.69-1.93) | 0.575 |
High school | 56 (30.8) | Ref. | -- |
Vocational and university | 10 (31.2) | 1.02 (0.45-2.30) | 0.956 |
Employment status | |||
Employed | 98 (33.7) | 3.17 (1.06-9.47) | 0.028 |
Unemployed | 4 (13.8) | Ref. | -- |
Engaged in sex work in last year | |||
Yes | 61 (32.4) | 1.07 (0.66-1.74) | 0.759 |
No | 41 (30.8) | Ref. | -- |
Income per month2 | |||
Poverty line and below ($326) | 61 (29.7) | Ref. | -- |
More than $326 | 30 (36.1) | 1.33 (0.78-2.29) | 0.291 |
Housing situation | |||
Own | 34 (37.4) | 2.36 (1.26-4.43) | 0.005 |
Rental | 33 (38.8) | 2.51 (1.32-4.76) | 0.003 |
Family home | 24 (20.2) | Ref. | |
Age at first intercourse | |||
≤17 years old | 97 (33.4) | 2.61 (0.96-7.07) | 0.049 |
>18 years old | 5 (16.1) | Ref. | -- |
Age difference with the last sexual partner | |||
≤10 years apart | 73 (27.5) | Ref. | -- |
>10 years apart | 24 (51.0) | 2.74 (1.44-5.22) | 0.001 |
Own perception of HIV risk | |||
Higher | 36 (32.4) | 2.60 (1.44-4.69) | 0.001 |
Equal or less | 26 (25.6) | Ref. | -- |
Knowledge of HIV transmission risks | |||
Yes | 75 (36.2) | 1.85 (1.09-3.12) | 0.018 |
No | 27 (23.5) | Ref. | -- |
Stable partner, last six months | |||
Yes | 25 (26.9) | Ref. | -- |
No | 77 (33.8) | 1.38 (0.81-2.37) | 0.229 |
Casual partner, last six months | |||
Yes | 60 (28.3) | Ref. | -- |
No | 41 (38.7) | 1.59 (0.97-2.62) | 0.061 |
Frequency of condom use | |||
Always | 51 (38.9) | 1.84 (1.12-3.02) | 0.013 |
Not always | 45 (25.7) | Ref. | -- |
History of STD, lifetime | |||
Yes | 8 (34.8) | 1.16 (0.47-2.84) | 0.740 |
No | 94 (31.4) | Ref. | -- |
Substance use in last twelve months | |||
Alcohol | |||
Yes | 47 (40.9) | 1.88 (1.15-3.07) | 0.010 |
No | 54 (26.9) | Ref. | -- |
Marijuana | |||
Yes | 23 (32.4) | 1.02 (0.58-1.81) | 0.929 |
No | 78 (31.8) | Ref. | |
Cocaine | |||
Yes | 45 (46.9) | 2.63 (1.57-4.41) | <0.001 |
No | 55 (25.1) | Ref. | -- |
Sedatives, sleeping pills | |||
Yes | 3 (42.9) | 1.63 (0.36-7.45) | 0.523 |
No | 97 (31.5) | Ref. | -- |
Crack | |||
Yes | 14 (43.7) | 1.78 (0.84-3.76) | 0.124 |
No | 86 (30.4) | Ref. | -- |
Tested for HIV in the last 12 months | |||
Yes | 31 (20.5) | Ref. | -- |
No | 71 (46.7) | 3.39 (1.99-5.75) | <0.001 |
Received a condom from an HIV prevention program, last 12 months | |||
Yes | 95 (35.6) | 3.49 (1.41-8.69) | 0.004 |
No | 6 (13.6) | Ref. | |
Knows where to get a free condom | |||
Yes | 100 (35.1) | 8.38 (1.91-36.79) | <0.001 |
No | 2 (6.1) | Ref. | -- |
Accessed by a peer educator, last 12 months | |||
Yes | 65 (38.9) | 1.96 (1.20-3.21) | 0.006 |
No | 37 (24.5) | Ref. | -- |
*Not able to calculate OR due to 0 in a cell.
*N=175 respondents. Some categories do not add up to total due to missing responses (n<5 unless indicated).
In multivariable analysis (Table 3), independent risk factors for HIV infection were age at first intercourse ≤17 years old (adjusted odds ratio [aOR] 5.47, 95% CI 1.05-28.42), more than ten years difference in age with the last sexual partner (aOR 1.60, 95% CI 1.04-2.46), and substance use in the last 12 months (aOR 3.00, 95% CI 1.47-6.12). Additionally, higher perception of HIV risk (aOR 3.08, 95% CI 1.53-6.17), having tested for HIV in the last 12 months (aOR 1.23, 95% CI 1.09-1.39), and being accessed by a peer educator in the last 12 months (aOR 3.86, 95% CI 1.77-8.38) were associated with higher HIV prevalence. Of note, these last three factors occurred most frequently among transgender women who already knew their HIV-positive status.
Table 3.
Multivariable analysis: independent risk factors for HIV infection among transgender women, Paraguay, 2021 (N=322).
Variables | Adjusted OR | 95% CI | p-value |
---|---|---|---|
Age at first intercourse ≤17 years old | 5.47 | 1.05 - 28.42 | 0.043 |
Age difference with the last sexual partner >10 years | 1.60 | 1.04 - 2.46 | 0.031 |
Substance use, last twelve months (mostly cocaine) | 3.00 | 1.47 - 6.12 | 0.002 |
Higher perception of risk for HIV | 3.08 | 1.53 - 6.17 | 0.002 |
Not tested for HIV, last 12 months | 1.23 | 1.09 - 1.39 | 0.001 |
Accessed by a peer educator, last 12 months | 3.86 | 1.77 - 8.38 | 0.001 |
Discussion
In the present study we found an extremely high prevalence of HIV in transgender women in multiple regions of Paraguay. The prevalence of HIV among transgender women in our country notably falls well above the estimated pooled prevalence of 19.1% (95% CI 17.4-20.7) for transgender women worldwide (1).
In the prior survey of Aguilar et al (4), risk factors for HIV infection among transgender women in Paraguay were older age, the use of cocaine during sex, and residence in Asunción. We corroborate that older age and cocaine use continue to be associated with HIV among transgender women in Paraguay. While HIV prevalence is expected to accumulate with increasing age, particularly in an era of improved survival with antiretroviral therapy, it is important to note that HIV prevalence was already 12.4% by the age of 24 years. Such high prevalence among youth implies rapid HIV incidence or acquisition from an early age, as found among transgender women in neighboring Brazil (8). Cocaine and use of other substances have also been documented as risk factors for HIV among transgender women in the world literature (1,4,6,9-10,16-17). Notably different in our survey of 2021 compared to 2017 (4) is that HIV prevalence now appears to have risen in areas outside the capital and main city of Asunción, with possibly higher prevalence in the Central region surrounding the city.
Also new to the present study, we found HIV infection to be associated with early age of first sexual intercourse and intergenerational sex. The age of sexual consent in Paraguay is 14 years for heterosexual sex and 16 years for homosexual sex (18). With a mean age of first sex at below 14, many participants were having sex before the age of legal consent, and therefore likely in abusive situations. Studies have demonstrated the relationship between sexual abuse in childhood and subsequent substance abuse and sexual risk behaviors in cis male and cis female heterosexuals, and in men who have sex with men (MSM) (19-23). Independently of young age of sexual onset, having partners with 10 or more years age difference was also significantly associated with HIV. The relationship between number of male partners and age disparate relationships may increase HIV risk for young transgender women by connecting them to larger and older sexual networks with higher HIV prevalence (24-25). For example, HIV prevalence in the present study was 12.4% among transgender women aged 15 to 24 years yet increased to 47.5% for transgender women aged 35 years and above. The risk for HIV through intergenerational sex has been described in studies with MSM (26) and among adolescent girls and young women (20-21,24-25).
We also found HIV associated with markers of connection to prevention programs, including higher perception of risk and being accessed by a peer educator in the last 12 months. However, we must take into account that these factors occurred more often in people with a known diagnosis of HIV, a group we expect to be linked to programs compared to persons unaware of their HIV status. Moreover, persons already diagnosed would usually not have to retake an HIV test, accounting for the higher prevalence among those not testing in the last 12 months. Taken together, the data indicated that prevention programs need to reach transgender women living with HIV who are not diagnosed and those who are HIV-negative but at high risk.
Our survey did not corroborate risk factors for HIV found in other studies of transgender women. For example, several studies have described an association between engaging in sex work and HIV risk among transgender women in diverse locations worldwide (3,9,27-28). Our data found equally high prevalence among transgender women engaging and not engaging in sex work (29). In contrast to other studies (6,30-32), we did not find income, housing, or employment status associated with HIV in multivariate analysis, although in bivariate analysis indicators of higher socio-economic status tended towards higher HIV prevalence. We also did not find an association between HIV and history of STD, again in contrast to the global literature (1-3,16). The lack of association may also be related to transgender women with known HIV infection having greater access to sexual health services.
We recognize other limitations to our study. First, our sample does not represent transgender women in rural areas. The recruitment of sexual and gender minority persons is difficult in areas where they do not visibly congregate or have small social networks. Second, there is no census in Paraguay for transgender women against which to gauge the representativeness of our sample. Paraguay has not yet implemented a two-step set of questions to determine sex assigned at birth and current gender identity in official documents. Third, the use of an interviewer-administered survey instrument may have heightened social desirability bias and therefore under-reporting for sensitive topics, such as age of sexual onset, sex work, and drug use.
In conclusion, current findings show a high HIV prevalence among transgender women in Paraguay with evidence of continuing high incidence as evidence by the level of infection among young participants and the increase in prevalence since 2017. We identify childhood sexual intercourse, large age differences with sexual partners, and substance use (largely cocaine) as driving factors in risk for HIV. Longitudinal data, expanding information to geographic areas outside large cities, and studies of sexual partners of transgender women are needed to better understand the factors for HIV acquisition that have led to such high prevalence in Paraguay. Effective prevention interventions, such as pre-exposure prophylaxis (PrEP) (33), are needed particularly for transgender women who are young and in partnerships with age and power imbalances.
Acknowledgments
We wish to acknowledge the support from the University of California, San Francisco’s International Traineeships in AIDS Prevention Studies (ITAPS), U.S. NIMH, R25MH123256 for the preparation of this manuscript. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
Funding:
Support was provided by The Global Fund to Fight HIV, Tuberculosis and Malaria; the Centro de Informacio y Recursos para el Desarrollo (CIRD), and the Ministry of Public Health of Paraguay.
Footnotes
Conflicts of interest/Competing interests: The authors declare they have no conflicts of interests.
Ethics approval: The study protocol was reviewed and approved by the Ethics Committee of the Central Laboratory of Public Health of Paraguay.
Consent to participate: All participants provided verbal informed consent; minors were deemed emancipated and consented for their participation.
Consent for publication: The survey was conducted anonymously to protect participants’ privacy and identity.
Availability of data and material (data transparency): Due to the small number of trans women in Paraguay, participant-level data runs the risk of identifying individuals by specifying multiple characteristics. Therefore, sharing of data will be made on a case-by-case basis by contacting the corresponding author.
References
- 1.Baral SD, Poteat T, Strömdahl S, Wirtz AL, Guadamuz TE, Beyrer C. Worldwide burden of HIV in transgender women: a systematic review and meta-analysis. Lancet Infect Dis. 2013. Mar;13(3):214–22. doi: 10.1016/S1473-3099(12)70315-8. [DOI] [PubMed] [Google Scholar]
- 2.MacCarthy S, Poteat T, Xia Z, Roque NL, Hyun Jin Kim A, Baral S, Reisner SL. Current research gaps: a global systematic review of HIV and sexually transmissible infections among transgender populations. Sex Health. 2017. Oct;14(5):456–468. doi: 10.1071/SH17096. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 3.Becasen JS, Denard CL, Mullins MM, Higa DH, Sipe TA. Estimating the Prevalence of HIV and Sexual Behaviors Among the US Transgender Population: A Systematic Review and Meta-Analysis, 2006-2017. Am J Public Health. 2019. Jan;109(1):e1–e8. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 4.Aguilar G, Samudio T, Lopez G, Jimenez L, Wilson EC, McFarland W, et al. High HIV prevalence among transgender women in Paraguay. Int J STD AIDS. 2020. Nov;31(13):1308–1314. [DOI] [PubMed] [Google Scholar]
- 5.UNAIDS. Accessed 13 March, 2023 at: https://www.unaids.org/en/resources/documents/2023/2022_unaids_data
- 6.Logie CH, Lacombe-Duncan A, Wang Y, Jones N, Levermore K, Neil A, et al. Prevalence and Correlates of HIV Infection and HIV Testing Among Transgender Women in Jamaica. AIDS Patient Care STDS. 2016. Sep;30(9):416–24. [DOI] [PubMed] [Google Scholar]
- 7.Dos Ramos Farías MS, Garcia MN, Reynaga E, Romero M, Vaulet ML, Fermepín MR, et al. First report on sexually transmitted infections among trans (male to female transvestites, transsexuals, or transgender) and male sex workers in Argentina: high HIV, HPV, HBV, and syphilis prevalence. Int J Infect Dis. 2011. Sep;15(9):e635–40. [DOI] [PubMed] [Google Scholar]
- 8.Grinsztejn B, Jalil EM, Monteiro L, Velasque L, Moreira RI, Garcia AC, et al. Transcender Study Team. Unveiling of HIV dynamics among transgender women: a respondent-driven sampling study in Rio de Janeiro, Brazil. Lancet HIV. 2017. Apr;4(4):e169–e176. doi: 10.1016/S2352-3018(17)30015-2. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 9.Herbst JH, Jacobs ED, Finlayson TJ, McKleroy VS, Neumann MS, Crepaz N. HIV/AIDS Prevention Research Synthesis Team. Estimating HIV prevalence and risk behaviors of transgender persons in the United States: a systematic review. AIDS Behav. 2008. Jan;12(1):1–17. doi: 10.1007/s10461-007-9299-3. [DOI] [PubMed] [Google Scholar]
- 10.Yan H, Xiao W, Chen Y, Chen Y, Lin J, Yan Z, et al. High HIV prevalence and associated risk factors among transgender women in China: a cross-sectional survey. J Int AIDS Soc. 2019. Nov;22(11):e25417. doi: 10.1002/jia2.25417. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 11.Jaspal R, Kennedy L, Tariq S. Human Immunodeficiency Virus and Trans Women: A Literature Review. Transgend Health. 2018. Dec 28;3(1):239–250. doi: 10.1089/trgh.2018.0005. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 12.Karon JM, Wejnert C. Statistical methods for the analysis of time-location sampling data. J Urban Health. 2012. Jun;89(3):565–86. doi: 10.1007/s11524-012-9676-8. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 13.Gile KJ, Johnston LG, Salganik MJ. Diagnostics for Respondent-driven Sampling. J R Stat Soc Ser A Stat Soc. 2015. Jan;178(1):241–269. doi: 10.1111/rssa.12059. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 14.Raymond HF, Chen YH, McFarland W. "Starfish Sampling": a Novel, Hybrid Approach to Recruiting Hidden Populations. J Urban Health. 2019. Feb;96(1):55–62. doi: 10.1007/s11524-018-0316-9. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 15.US Department of Health and Human Services. The Belmont report. Ethical principles and guidelines for the protection of human subjects of biomedical and behavioral research. https://www.hhs.gov/ohrp/sites/default/files/the-belmont-report-508c_FINAL.pdf
- 16.Ferreira ACG, Coelho LE, Jalil EM, Luz PM, Friedman RK, Guimarães MRC, et al. Transcendendo: A Cohort Study of HIV-Infected and Uninfected Transgender Women in Rio de Janeiro, Brazil. Transgend Health. 2019. Apr 5;4(1):107–117. doi: 10.1089/trgh.2018.0063. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 17.Rowe C, Santos GM, McFarland W, Wilson EC. Prevalence and correlates of substance use among trans female youth ages 16-24 years in the San Francisco Bay Area. Drug Alcohol Depend. 2015. Feb 1;147:160–6. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 18.Wikipedia. Accessed 13 March, 2023 at: https://en.wikipedia.org/wiki/Ages_of_consent_in_South_America#:~:text=1860%20buggery%20laws.-,Paraguay,years%20imprisonment%20or%20a%20fine
- 19.Phillips G 2nd, Magnus M, Kuo I, Rawls A, Peterson J, Montanez L, et al. Childhood sexual abuse and HIV-related risks among men who have sex with men in Washington, DC. Arch Sex Behav. 2014. May;43(4):771–8. doi: 10.1007/s10508-014-0267-5 [DOI] [PubMed] [Google Scholar]
- 20.Scheidell JD, Kumar PC, Campion T, Quinn K, Beharie N, McGorray SP, Khan MR. Child Sexual Abuse and HIV-Related Substance Use and Sexual Risk Across the Life Course Among Males and Females. J Child Sex Abus. 2017. Jul;26(5):519–534. doi: 10.1080/10538712.2017.1319004. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 21.Wilson HW, Widom CS. Pathways from childhood abuse and neglect to HIV-risk sexual behavior in middle adulthood. J Consult Clin Psychol. 2011. Apr;79(2):236–46. doi: 10.1037/a0022915. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 22.Kalichman SC, Gore-Felton C, Benotsch E, Cage M, Rompa D. Trauma symptoms, sexual behaviors, and substance abuse: correlates of childhood sexual abuse and HIV risks among men who have sex with men. J Child Sex Abus. 2004;13(1):1–15. doi: 10.1300/J070v13n01_01. [DOI] [PubMed] [Google Scholar]
- 23.Lloyd S, Operario D. HIV risk among men who have sex with men who have experienced childhood sexual abuse: systematic review and meta-analysis. AIDS Educ Prev. 2012. Jun;24(3):228–41. doi: 10.1521/aeap.2012.24.3.228. [DOI] [PubMed] [Google Scholar]
- 24.Maughan-Brown B, Kenyon C, Lurie MN. Partner age differences and concurrency in South Africa: Implications for HIV-infection risk among young women. AIDS Behav. 2014. Dec;18(12):2469–76. doi: 10.1007/s10461-014-0828-6. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 25.Harling G, Newell ML, Tanser F, Bärnighausen T. Partner Age-Disparity and HIV Incidence Risk for Older Women in Rural South Africa. AIDS Behav. 2015. Jul;19(7):1317–26. doi: 10.1007/s10461-014-0952-3. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 26.Bingham TA, Harawa NT, Johnson DF, Secura GM, MacKellar DA, Valleroy LA. The effect of partner characteristics on HIV infection among African American men who have sex with men in the Young Men's Survey, Los Angeles, 1999-2000. AIDS Educ Prev. 2003. Feb;15(1 Suppl A):39–52. doi: 10.1521/aeap.15.1.5.39.23613. [DOI] [PubMed] [Google Scholar]
- 27.Operario D, Soma T, Underhill K. Sex work and HIV status among transgender women: systematic review and meta-analysis. J Acquir Immune Defic Syndr. 2008;48:97–103. [DOI] [PubMed] [Google Scholar]
- 28.Costa AB, Fontanari AM, Jacinto MM, da Silva DC, Lorencetti EK, da Rosa Filho HT, Mueller A, de Garcia CG, Nardi HC, Koller SH, Lobato MI. Population-based HIV prevalence and associated factors in male-to-female transsexuals from Southern Brazil. Arch Sex Behav. 2015. Feb;44(2):521–4. [DOI] [PubMed] [Google Scholar]
- 29.Jennings Mayo-Wilson L, Benotsch EG, Grigsby SR, Wagner S, Timbo F, Poteat T, et al. Combined effects of gender affirmation and economic hardship on vulnerability to HIV: a qualitative analysis among U.S. adult transgender women. BMC Public Health. 2020. May 26;20(1):782. doi: 10.1186/s12889-020-08902-3. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 30.Maulsby CH, Ratnayake A, Hesson D, Mugavero MJ, Latkin CA. A Scoping Review of Employment and HIV. AIDS Behav. 2020. Oct;24(10):2942–2955. doi: 10.1007/s10461-020-02845-x. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 31.Fletcher JB, Kisler KA, Reback CJ. Housing status and HIV risk behaviors among transgender women in Los Angeles. Arch Sex Behav. 2014. Nov;43(8):1651–61. doi: 10.1007/s10508-014-0368-1. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 32.Wilson EC, Turner C, Arayasirikul S, Woods T, Nguyen T, Lin R, et al. Housing and income effects on HIV-related health outcomes in the San Francisco Bay Area - findings from the SPNS transwomen of color initiative. AIDS Care. 2018. Nov;30(11):1356–1359. doi: 10.1080/09540121.2018.1489102. [DOI] [PubMed] [Google Scholar]
- 33.Pacífico de Carvalho N, Mendicino CCP, Cândido RCF, Alecrim DJD, Menezes de Pádua CA. HIV pre-exposure prophylaxis (PrEP) awareness and acceptability among trans women: a review. AIDS Care. 2019. Oct;31(10):1234–1240. doi: 10.1080/09540121.2019.1612014. [DOI] [PubMed] [Google Scholar]