HIV, syphilis and hepatitis B prevalence, related risk behaviours and correlates of condom use among transgender women in two cities in Sri Lanka: findings from respondent-driven sampling surveys.

Unlabelled: Background Biobehavioural data on transgender women (TGW) are limited globally.

Methods: We used data collected as part of the 2017-18 National Integrated HIV Biobehavioural Survey, which included 254 TGW in Colombo and 252 in Jaffna, for structured questionnaire interviews and biological testing. We performed multivariable logistic regression analysis to explore factors associated with condom use.

Beach boys in Galle, Sri Lanka: multiple HIV risk behaviours and potential for HIV bridging.

Background: There are limited data globally on HIV in men who engage in casual and transactional sex with female tourists.

Methods: In 2018 we carried out a respondent-driven sampling (RDS) survey among beach boys in Galle, Sri Lanka, to determine prevalence of HIV and other infections, HIV risk behaviours and utilisation of HIV prevention services. Eligibility criteria included men who cruise in and around beach areas and who had anal and/or vaginal sex with female or male tourists in the 12 months before the survey.

HIV prevalence, sexual risk behaviours and HIV testing among female sex workers in three cities in Sri Lanka: Findings from respondent-driven sampling surveys.

Sri Lanka has a low-level HIV epidemic. This study aims to provide evidence on HIV, syphilis and hepatitis B (HBV) prevalence, sexual risk behaviours and utilisation of HIV prevention interventions among female sex workers (FSW) in the cities Colombo, Galle, and Kandy. Using respondent-driven sampling (RDS), we recruited a total of 458 FSW in Colombo, 360 in Galle and 362 in Kandy from November 2017 to March 2018.

Estimating the population size of female sex workers and transgender women in Sri Lanka.

We implemented population size estimation of female sex workers (FSW) and transgender women (TGW) in Sri Lanka in 2018 using several approaches (geographical mapping, service and unique object multiplier and a modified Delphi method during the stakeholder consensus meeting). Mapping was done in 49 randomly selected Divisional Secretariats, which provided a basis for extrapolation of size estimates to the national level. Two types of adjustments were applied on the mean (minimum-maximum) population estimate obtained during mapping: (1) an adjustment for mobility to reduce double counting of FSW and TGW frequenting multiple spots, obtained during mapping; (2) an adjustment for "a hidden population", obtained from surveys among FSW and TGW.