Abstract
Objective
To examine the trends of HIV prevalence, risk behaviours and HIV testing among men who have sex with men (MSM) in Nanjing.
Design
Five consecutive cross-sectional surveys.
Setting
Nanjing, China.
Primary and secondary outcome measures
HIV and syphilis prevalence, HIV testing rate and factors associated with HIV infection; demographic characteristics and behaviours.
Results
649, 669, 577, 633, 503 MSM were recruited from 2013 to 2017. HIV prevalence was 9.9%, 12.3%, 12.5%, 9.8% and 10.1%, respectively. Syphilis prevalence decreased with a range from 10.6% to 5.6%. Risk behaviours like unprotected anal intercourse (UAI) and unprotected virginal sex in the past 6 months decreased, but multiple sex partners and ever used rush popper rose significantly. MSM tested for HIV in the previous year remained stable from 57.0% to 64.1% (P=0.633). Multivariate analysis showed that tested for HIV in the past year was protective factor against HIV infection. MSM who had UAI in the past 6 months, sex role as receptive and dual, diagnosed with sexually transmitted diseases (STDs) in the past year and currently syphilis infected were risk factors for HIV infection.
Conclusions
We observed stable high HIV prevalence, a steady HIV testing rate, decreasing syphilis prevalence and UAI among MSM in Nanjing. However, rush popper use rose dramatically. The HIV preventive strategies for MSM including condom promotion, HIV testing expansion and reduction of rush popper use, STDs screening and standardised treatment should be strengthened.
Keywords: HIV, MSM, Prevalence, Risk behaviors
Strengths and limitations of this study.
The present study is designed to assess the recent HIV prevalence, risk behaviours and HIV testing trends among men who have sex with men (MSM) in Nanjing.
We analysed and confirmed several factors associated with HIV infection using pooled 5 years’ data.
Rush popper use among Nanjing MSM had a rising trend.
Snow ball sampling and internet convenience sampling may not yield a representative sample of the general MSM population; these data should be interpreted with caution.
Face-to-face investigation may under evaluate risk behaviours due to the issue of social desirability.
Introduction
In recent years, a fast-spreading HIV epidemic among men who have sex with men (MSM) presented a new challenge worldwide.1 2 In China, MSM transmission has surpassed both injection drug use and blood donors and has become the major HIV transmission route.3 4 The overall HIV prevalence, from national MSM sentinel surveillance data, demonstrated a rising trend from 0.9% in 2003 to 6.3% in 2011.5
Nanjing is the capital city of Jiangsu Province, eastern China, with a total population of 8.6 million. Consistent with many other metropolitan cities of China, homosexual transmission has become the major route of HIV transmission in Nanjing.6 According to the national direct network HIV/AIDS Case Reporting System, the annual proportion of newly reported HIV cases attributed to homosexual transmission rose from 44.3% in 2008 to 63.5% in 20127 and to 71.3% in 2015 in Nanjing. Recent studies have highlighted a higher prevalence of club drugs use among MSM,8 and rush popper (inhalant nitrites) is the most popular. Research has documented that rush popper use may increase HIV transmission by increasing engagement in high risk sex behaviours among MSM.9
In response to the escalating HIV epidemic among MSM, Nanjing implemented comprehensive prevention strategies over the past decade. Condom promotion and lubricant distribution were free in MSM popular venues. Almost 40 voluntary HIV testing and counselling sites were established across the city to provide friendly HIV testing service. From 2008 to 2012, under the implementing of China-Bill Melinda Gates Foundation on HIV/AIDS programme and the Global Fund to Fight AIDS programme in Nanjing, a growing number of MSM Community Based Organisations (CBOs) established and provided peer-led HIV rapid testing and referrals to treatment.
In 2013, the Chinese national centre for AIDS/sexually transmitted diseases (STDs) control and prevention launched Expanding HIV Testing and Scale-up Antiretroviral Therapy (ART) Programme in eight cities over the country, Nanjing was one of them. The programme implemented various measures. On one hand, Centers for Disease Control and Prevention (CDC) led health education programmes, HIV testing days, referrals for ART and standardised STDs treatment. On the other hand, CBOs carried out condom and lubricant distribution, behavioural interventions and provision of HIV rapid testing kits. After each test, staff of CDC or CBO provided risk-reduction counselling.
However, it is unknown whether these strategies reduced the HIV prevalence among MSM, and to what extent their risk behaviours were changed. Therefore, we designed and conducted five consecutive cross-sectional surveys from 2013 to 2017, aimed to identify the trends of HIV and syphilis prevalence, risk behaviours and HIV testing among MSM. We also analysed the factors correlated with HIV infection using the pooled 5 years’ survey data.
Methods
Participants
Participants met the following criteria: 16 years of age or older, male, had oral or anal sex with a male in the previous year, could provide written informed consent and were willing to complete the study.
Sampling method and participant recruitment
We employed two methods to recruit participants: snow ball sampling and internet convenience sampling. For snow ball sampling, the participants were recruited from MSM venues such as bars, clubs, saunas, and public restrooms. Initial ‘seed’ participants were recommended by volunteers of CBOs or staffs of MSM bars. Each initial seed was invited to participate in the study and then asked to invite other person with the same inclusion criteria. We also posted study advertisements on some MSM social platforms and the Nanjing CDC official website, inviting MSM to participate in our study. These recruit processes continued from April to July in each year.
Study procedures
We designated two survey sites in Nanjing. They were VCT clinics in the Nanjing municipal CDC and Qinhuai district CDC. All interviewers were CDC staff members who were well trained. We screened for duplicate reported telephone numbers and excluded those repeated participants during a same survey year. The survey sites, main interviewers and recruit methods were consistent during the 5 years surveys.
After the qualification screening, every participant signed a consent form before the formal investigation. Face-to-face interviews were used to collect information including demographic characteristics, sexual behaviours in the past 6 months (with males and females), drugs use, STD diagnoses and HIV testing history. No name or identifying information was collected; 5 mL of whole blood was collected for HIV and syphilis test. After testing, we offered HIV risk-reduction counselling for each participant. Confirmed HIV cases were subsequently referred to the designated free ART clinic for treatment, and current syphilis cases were referred to standardised STDs clinics for treatment.
Laboratory testing
Blood samples were screened for HIV-1 antibody with a rapid test (Determine HIV-1/2, Alere Medical, Chiba Prefecture, Japan). Positive samples were retested by an enzyme-linked immunoassay (HIV Ag/Ab ELISA KIT 96T, Zhuhai Livzon Diagnostics, China), ELISA-positive cases were confirmed with a western blot assay (HIV BLOT 2.2, MP, Singapore). Syphilis screening was performed by Treponema pallidum particle assay (TPPA) (Alere Medical), and confirmed by the rapid plasma regain test (RPR) (Diagnosis; Shanghai, Kehua, China). TPPA-positive and RPR-positive participants were determined to be currently syphilis infected.
Variable definitions
‘Unprotected anal intercourse (UAI)’ was defined as inconsistent use of condoms during anal sex with male partners in the past 6 months; ‘unprotected vaginal intercourse (UVI)’ was defined as inconsistent use of condoms during vaginal sex with female partners in the past 6 months. We defined ‘multiple sexual partners’ as having had two or more sexual partners in the past 6 months. ‘Ever used drugs’ were defined as ever used heroin or opium.
Statistical analysis
Data were double entered and checked for accuracy using Epi Data software (V.3.0: Epi Data Association, Odense, Denmark). Descriptive statistics were used to describe participant’s demographic characteristics and prevalence rate. Trend tests were performed using χ2 tests with linear-by-linear analysis. Univariate and multivariate logistic regression analyses were conducted to adjust ORs for potential confounding. Only variables that were significant in univariate analyses at P<0.1 were included in the multivariate logistic regression models. A P value <0.05 (two-tailed) was considered to be statistically significant. All statistical analyses were conducted using SPSS software (V.20; IBM, Armonk, New York, USA).
Patient involvement
Patients were not involved in setting the research question, the outcome measures, the design or the implementation of the study. No patients were asked to advise on interpretation or writing up of results. No patients were advised on dissemination of the present study and its main results.
Results
Demographic and social characteristics
Demographic characteristics of the participants in the 5-year surveys are presented in table 1. The number of self-reported MSM was 649, 669, 577, 633 and 503, respectively. The composition of the samples and their corresponding characteristics were comparable in the five surveys. The majority of participants were aged 20~49 years, single, Han ethnicity, Jiangsu residents and highly educated. Over 90% of participants were either homosexual or bisexual. Significantly more MSM were single and highly educated.
Table 1.
Demographic characteristics among men who have sex with men in Nanjing, 2013–2017
| Variables | 2013 | 2014 | 2015 | 2016 | 2017 | Linear-by-linear χ2 | P value |
| Total sample | 649 | 669 | 577 | 633 | 503 | – | – |
| Age group (years) | 0.061 | 0.805 | |||||
| <20 | 6.0 (39) | 4.3 (29) | 5.4 (31) | 2.0 (18) | 3.8 (20) | ||
| 20∼49 | 86.0 (558) | 84.9 (568) | 89.1 (514) | 91.0 (557) | 89.1 (467) | ||
| ≥50 | 8.0 (52) | 10.8 (72) | 5.5 (32) | 6.0 (37) | 7.1 (37) | ||
| Marital status | 30.186 | <0.001 | |||||
| Single, divorced or widowed | 73.3 (476) | 74.6 (499) | 81.3 (469) | 81.5 (516) | 84.5 (425) | ||
| Married or live together | 26.7 (173) | 25.4 (170) | 18.7 (108) | 18.5 (117) | 15.5 (78) | ||
| Han ethnic | 97.4 (632) | 98.7 (660) | 97.9 (565) | 98.6 (624) | 97.0 (488) | 0.074 | 0.785 |
| Residency (hukou) in Jiangsu | 68.4 (444) | 71.4 (478) | 66.7 (385) | 69.0 (437) | 67.6 (340) | 0.437 | 0.509 |
| Education | 24.910 | <0.001 | |||||
| Junior high school and lower | 18.0 (117) | 13.2 (88) | 11.4 (66) | 11.8 (75) | 9.5 (48) | ||
| Senior high school or skill school | 24.3 (158) | 22.1 (148) | 20.8 (120) | 18.5 (117) | 21.9 (110) | ||
| College and higher | 57.6 (374) | 64.7 (433) | 67.8 (391) | 69.7 (441) | 68.6 (345) | ||
| Sex orientation | 1.303 | 0.2524 | |||||
| Homosexual/bisexual | 94.1 (611) | 93.6 (626) | 92.7 (535) | 94.8 (600) | 95.4 (480) | ||
| Heterosexual/not sure | 5.9 (38) | 6.4 (43) | 7.3 (42) | 5.2 (33) | 4.6 (23) |
Trends in HIV prevalence, risk behaviours and HIV testing
The trends of HIV prevalence, sexual behaviours, STD diagnosis and HIV testing rates among MSM are presented in table 2. The HIV prevalence among MSM range from 9.9% to 12.5%, the trend was not significant. There was a decreasing trend of current syphilis prevalence with the range from 10.6% to 5.6%. During the 5 years of the study, some risk behaviours like UAI, vaginal sex and UVI in the past 6 months showed decreasing trends. On the other hand, the rate of multiple sexual partners and ever used rush popper indicated significantly increasing trends. The behaviours including anal sex, commercial anal sex, ever used drugs, diagnosed with STDs and tested for HIV showed no significant change.
Table 2.
Trends in HIV prevalence, risk behaviours and HIV testing among MSM in Nanjing, 2013–2017
| Variables | 2013 | 2014 | 2015 | 2016 | 2017 | Linear-by-linear χ2 | P value |
| % (n) | % (n) | % (n) | % (n) | % (n) | |||
| HIV infection | 9.9 (64) | 12.3 (82) | 12.5 (72) | 9.8 (62) | 10.1 (51) | 0.181 | 0.670 |
| Current syphilis infection | 6.2 (40) | 10.6 (71) | 5.9 (34) | 4.7 (30) | 5.6 (28) | 5.043 | 0.025 |
| Had anal sex, last 6 months | 86.1 (559) | 81.0 (542) | 76.4 (441) | 83.6 (529) | 80.7 (406) | 2.958 | 0.085 |
| Had UAI, last 6 months | 50.7 (329) | 42.5 (284) | 43.0 (248) | 41.2 (261) | 41.7 (210) | 9.433 | 0.002 |
| Multiple sex partners, last 6 months | 55.6 (361) | 49.6 (332) | 46.3 (267) | 57.3 (363) | 62.0 (312) | 19.194 | <0.001 |
| Had commercial anal sex, last 6 months | 2.8 (18) | 3.6 (24) | 3.1 (18) | 5.6 (17) | 4.4 (18) | 3.397 | 0.065 |
| Had vaginal sex, last 6 months | 22.2 (144) | 22.4 (150) | 19.2 (111) | 19.9 (126) | 16.3 (82) | 7.034 | 0.008 |
| Had UVI, last 6 months | 14.0 (91) | 15.1 (101) | 11.6 (67) | 13.7 (87) | 9.1 (46) | 6.791 | 0.009 |
| Ever used rush popper* | – | 12.9 (86) | 20.8 (120) | 23.1 (146) | 21.7 (109) | 17.879 | <0.001 |
| Ever used drugs | 2.0 (13) | 0.9 (6) | 1.7 (10) | 0.9 (6) | 1.2 (6) | 1.166 | 0.280 |
| Diagnosed with sexually transmitted disease, last 12 months | 6.9 (45) | 6.6 (44) | 4.7 (27) | 8.4 (53) | 7.0 (35) | 0.333 | 0.564 |
| Tested for HIV, last 12 months | 61.2 (397) | 64.1 (429) | 57.0 (329) | 63.2 (400) | 63.4 (319) | 0.228 | 0.633 |
*The data of ‘ever used rush poppers’ have not been collected in 2013.
MSM, men who have sex with men; UAI, unprotected anal intercourse; UVI, unprotected vaginal intercourse.
Factors associated with HIV infection
A total of 3031 participants were included. Table 3 presents the results of unvariable logistic analyses of factors related to HIV infection among participating MSM. Factors with p values <0.10 in univariable analysis were included in the multivariable model. Because the factors of ‘anal sex’ and ‘UAI’ in the past 6 months were correlated with each other (r=0.400, p<0.001), ‘anal sex’ was not included in multivariate logistic analysis. ‘Ever used rush popper’ was also excluded from multivariate logistic analysis for missing data in 2013. Table 4 shows the results of multivariate logistic regression analysis. Participants were more likely to be infected with HIV if they had UAI in the past 6 months, sex role as receptive or dual, diagnosed with STDs in the previous year and currently were syphilis infected. Participants tested for HIV in the previous year were less likely to be HIV infected compared with those not tested.
Table 3.
Univariate analysis of factors associated with HIV infection among MSM in Nanjing
| Factors | HIV infection % (n) | OR (95% CI) | P value |
| Age group (years) | |||
| <20 | 6.6 (9) | 1.000 | |
| 20∼49 | 11.1 (297) | 1.785 (0.898 to 3.546) | 0.098 |
| ≧50 | 10.9 (25) | 1.734 (0.785 to 3.834) | 0.174 |
| Residency (hukou) | |||
| Jiangsu | 11.1 (231) | 1.000 | |
| Others | 10.6 (100) | 0.947 (0.739 to 1.214) | 0.668 |
| Education level | |||
| Junior middle school and lower | 15.0 (59) | 1.000 | |
| Senior middle school/skill school | 12.7 (83) | 0.827 (0.577 to 1.185) | 0.300 |
| College and higher | 9.5 (189) | 0.598 (0.436 to 0.819) | 0.001 |
| Sex role | |||
| Insertive | 7.6 (80) | 1.000 | |
| Receptive | 13.6 (99) | 1.925 (1.410 to 2.628) | 0.001 |
| Dual | 9.5 (189) | 1.695 (1.276 to 2.252) | 0.001 |
| Anal sex, last 6 months | |||
| No | 9.0 (50) | 1.000 | |
| Yes | 11.3 (281) | 1.290 (0.940 to 1.769) | 0.114 |
| Multiple sex partners, last 6 months | |||
| No | 10.9 (158) | 1.000 | |
| Yes | 10.9 (173) | 0.996 (0.792 to 1.251) | 0.971 |
| Had UAI, last 6 months | |||
| No | 7.9 (135) | 1.000 | |
| Yes | 14.7 (196) | 1.999 (1.585 to 2.521) | 0.001 |
| Commercial sex, last 6 months | |||
| No | 10.9 (319) | 1.000 | |
| Yes | 12.6 (12) | 1.186 (0.640 to 2.197) | 0.587 |
| Had vaginal sex, last 6 months | |||
| No | 11.2 (272) | 1.000 | |
| Yes | 9.6 (59) | 0.840 (0.625 to 1.130) | 0.250 |
| Had UVI, last 6 months | |||
| No | 11.0 (272) | 1.000 | |
| Yes | 9.6 (59) | 0.937 (0.663 to 1.304) | 0.712 |
| Ever used rush popper | |||
| No | 10.0 (192) | 1.000 | |
| Yes | 16.3 (75) | 1.750 (1.311 to 2.336) | 0.001 |
| Ever used drugs | |||
| No | 10.7 (320) | 1.000 | |
| Yes | 26.8 (11) | 3059 (1.518 to 6.164) | 0.002 |
| Diagnosed with STD, last 12 months | |||
| No | 10.5 (296) | 1.000 | |
| Yes | 17.2 (35) | 1.771 (1.207 to 2.598) | 0.003 |
| Current syphilis infection | |||
| No | 10.1 (285) | 1.000 | |
| Yes | 22.7 (46) | 2.614 (1.841 to 3.712) | 0.001 |
| Tested for HIV, last 12 months | |||
| No | 12.9 (149) | 1.000 | |
| Yes | 9.7 (182) | 0.728 (0.578 to 0.916) | 0.007 |
MSM, men who have sex with men; STD, sexually transmitted disease; UAI, unprotected anal intercourse; UVI, unprotected vaginal intercourse.
Table 4.
Multivarible analysis of factors associated with HIV infection among MSM in Nanjing
| Factors | OR (95% CI) | P value |
| Education level | ||
| Junior middle school and lower | 1.000 | |
| Senior middle school/skill school | 0.883 (0.610 to 1.278) | 0.509 |
| College and higher | 0.700 (0.503 to 1.035) | 0.501 |
| Sex role | ||
| Insertive | 1.000 | |
| Receptive | 1.936 (1.409 to 2.660) | 0.001 |
| Dual | 1.684 (1.261 to 2.249) | 0.001 |
| Had UAI, last 6 months | ||
| No | 1.000 | |
| Yes | 2.046 (1.558 to 2.687) | 0.001 |
| Ever used drugs | ||
| No | 1.000 | |
| Yes | 1.874 (0.997 to 4.120) | 0.053 |
| Diagnosed with STD, last 12 months | ||
| No | 1.000 | |
| Yes | 1.610 (1.077 to 2.407) | 0.020 |
| Current syphilis infection | ||
| No | 1.000 | |
| Yes | 2.219 (1.531 to 3.217) | 0.001 |
| Tested for HIV, last 12 months | ||
| No | 1.000 | |
| Yes | 0.631 (0.437 to 0.912) | 0.014 |
The variables that included in multivariable analysis were below: education level, sex role, had UAI, ever used drugs, diagnosed with STD in last 12 months, current syphilis infection and test for HIV in last 12 months.
MSM, men who have sex with men; STD, sexually transmitted disease; UAI, unprotected anal intercourse.
Discussion
Over the five annual cross-sectional surveys, we found that HIV prevalence among MSM in Nanjing remained steady at a high level from 2013 to 2017. This trend is different from the period of 2008 to 2012 when a rapid increase from 6.6% (RDS sampling, 430 sample size)10 to 13.7% (snow ball sampling, 670 sample size)11 were reported. These surveys were conducted by the same work team and recruited from the same venues. We also observed almost 10% decline in UAI among MSM. These outcomes should be cautiously attributed to the comprehensive prevention programme implementation, especially the supply of risk-reduction counselling after each test. Compared with other cities, HIV prevalence among MSM in Nanjing was much lower than in the southwestern cities of Chongqing (21.2% in 2014)12 and Kunming (17.0% in 2014).13 It was higher than in Beijing14 (6.1% in 2011) or other countries (eg, 4.4% in India15 in 2010, 2.5% in the Republic of Cyprus16 in 2012). However, all of these comparisons should be considered cautiously as there were differences in methodologies used to estimate prevalence. Because HIV continues to spread in Nanjing, interventions should be continued and strengthened.
We found that the HIV testing rate in the previous year remained steady at around 60%, higher than that reported in Chongqing (43.5% in 2014),12 Beijing (42.6% in 2016)17 and Guangzhou (53.4% in 2013).18 It was also higher than the national annual HIV testing rate (50.4% in 2011) among MSM.19 HIV testing rate among MSM in Nanjing increased from only one in five in 2008 to nearly half in 2012,20 and then to almost two-thirds by 2017. The disclosure of HIV-positive status can have individual health benefits and potentially reduce community spread of HIV through early diagnosis and early initiation of ART.21 Our multivariate analysis confirmed that being tested for HIV in the previous year was a protective factor. However, there is still a gap in HIV testing rate among MSM between Nanjing and other areas, like Australia (80.5%)22 and the USA (67%).23 We need to continue the expanding test programme further.
It is alarming that rush popper use among MSM in Nanjing rose dramatically from 12.4% to 21.7%, it is just a little bit lower than that reported by Beijing (26.8%)24 or Shenyang (26.3%).25 Rush popper used to be a prescription drug prescribed to relieve angina. Now MSM is used to facilitate sexual intercourse due to its mechanism of relaxing the anal sphincter and dilating capillaries.26 Univariate analysis indicated that rush popper use was associated with a higher rate of HIV infection, which was consistent with other reports.24 25 27 Two factors may explain this result. First, rush popper has the effects on sexual behaviours such as promoting sexual desire, reducing sexual inhibition and decreasing physical experiences of pain, which may further prevent users from using condoms. Second, prior research had documented that rush popper use may increase HIV transmission through their engagement in group sex and multiple sex partners.28 Our findings underscore the need for specific intervention programmes to reduce rush popper use.
We analysed the factors associated with HIV infection using the pooled five surveys data. Consistent with other reports,12 29 our data confirmed that UAI is an important risk factor for HIV infection. Although there was a declining trend of UAI among MSM, slightly >40% of participants reported using condoms only intermittently or never. It is necessary to improve awareness of the risk of HIV infection among MSM and the need for consistent condom use during sexual activity. In the present study, anal sex role was found to be independent risk factor for HIV infection men who engaged exclusively or partially in receptive anal sex carry a higher risk of HIV infection, possibly because rectal mucosa is easily damaged during receptive anal sex, thus increasing the likelihood of HIV virus passing into their blood.30 Therefore, both the ‘receptive’ and ‘dual’ role MSM should probably be considered a priority target for condom promotion.
We observed a declining trend in current syphilis prevalence among MSM during these recent 5 years. Compared with previous report,11 current syphilis prevalence was lower than that in 2011 (9.1%) and 2012 (11.5%). This phenomenon is consistent with the report that syphilis infection has declined in China.30 The implementation of the syphilis prevention and control plan by the China’s Ministry of Health may have contributed to this decline.31 It is well known that STDs that cause ulcers or inflammation greatly increase the efficiency of HIV transmission, by increasing both the infectiousness and the susceptibility to HIV infection.32 The positive association observed between syphilis and HIV can be explained by similar risk behaviours.33 Thus, anyone presenting with syphilis should be tested for HIV and vice versa.34 Meanwhile, screening and standardising STDs treatment need to be continued to push this trend further.
Several limitations of our study should be noted. First, our participants were recruited from MSM venues, some MSM social platforms and a government internet site. Thus, they may not be representative of MSM who do not go to these venues or visit the website. ‘Hidden’ MSM may carry higher risk behaviours. Second, it is possible that face-to-face investigation may have underestimated the levels of risk behaviours due to the issue of social desirability. The study was however anonymous; fake names and study serial number were used to match the records. Third, our cross-sectional studies are inherently observational and descriptive; thus, we cannot infer causality.
Overall, our five consecutive surveys were carefully designed, implemented and quality controlled. Under the implementation of comprehensive interventions, we observed stable HIV prevalence, steady HIV testing rate, decreasing UAI and syphilis prevalence. However, an increasing use of rush popper was observed. In response to the high HIV burden among MSM in Nanjing, HIV prevention and intervention messages must be increased about the urgent need for consistent condom use, targeting especially those MSM who engage in any receptive anal intercourse (although condom use is also important for inserters), HIV testing expanded, rush popper use reduced, STD screening increased and more widespread use of standardised treatment implemented.
Supplementary Material
Acknowledgments
The authors are grateful to all the dedicated fieldworkers who took part in the surveys and all MSM participants who accepted the questionnaire investigation and blood sample providing. The authors would also like to thank MSM CBOs including: Nanjing Xingyou Community Based Organization, Nanjing Yeshanteng Bathroom Community Based Organization, Nanjing Bibochi Bathroom Community Based Organization and Nanjing Compass work studio.
Footnotes
Contributors: SW, YX, LL, XL were contributed to data collection. WX contributed to laboratory testing, FX contributed to the study design and quality control, ZZ was responsible for data analysis and manuscript writing, HY and RD contributed to manuscript revision. All authors read and approved the final manuscript.
Funding: The study was supported by outstanding Medical Academic Leader Programme of Jiangsu Provincial Center for Disease Control and Prevention (grant no. JKRC2011003), Jiangsu Department of Health Programme (grant no. H201330) and Nanjing Field Epidemiology Training Programme (first session).
Competing interests: None declared.
Patient consent: Not required.
Ethics approval: This study was approved by the Ethics Committee of the National Center for AIDS and STD Control, China CDC.
Provenance and peer review: Not commissioned; externally peer reviewed.
Data sharing statement: No additional data are available.
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