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To conduct the first population size estimation and biological and behavioral surveillance survey among men who have sex with men MSM in Angola. Population size estimation with multiplier method and a cross-sectional study using respondent-driven sampling.
Seven hundred ninety-two self-identified MSM accepted a unique object for population size estimation. Three hundred fifty-one MSM were recruited with respondent-driven sampling for biological and behavioral surveillance survey. Interviews and testing for HIV and syphilis were conducted on-site. Univariate, bivariate, and multivariate analyses examined factors associated with HIV and unprotected sex. Six imputation strategies were used for missing data for those refusing to test for HIV.
A population size of MSM was estimated. Twenty-seven of individuals were tested positive. Adjusted HIV prevalence was 3. With imputation, HIV seroprevalence was estimated between 3.
Risk behaviors are widely reported, but HIV seroprevalence is lower than expected. The difference between crude and adjusted values was mostly due to treatment of missing values in Respondent-Driven Sampling Analysis Tool.
Solutions are proposed in this article. Although concerns were raised about feasibility and adverse outcomes for MSM, the study was successfully and rapidly completed with no adverse effects. Since , HIV prevalence in Angola has been estimated from sentinel prenatal sites. Over the past few years, a number of epidemiological and behavioral studies have been conducted among MSM in Africa, even in countries where homosexuality is illegal.