Geibel Scott, van der Elst Elisabeth M, King'ola Nzioki, Luchters Stanley, Davies Alun, Getambu Esther M, Peshu Norbert, Graham Susan M, McClelland R Scott, Sanders Eduard J
Population Council, Nairobi, Kenya.
AIDS. 2007 Jun 19;21(10):1349-54. doi: 10.1097/QAD.0b013e328017f843.
Men who have sex with men (MSM) are highly vulnerable to HIV infection, but this population can be particularly difficult to reach in sub-Saharan Africa. We aimed to estimate the number of MSM who sell sex in and around Mombasa, Kenya, in order to plan HIV prevention research.
We identified 77 potential MSM contact locations, including public streets and parks, brothels, bars and nightclubs, in and around Mombasa and trained 37 MSM peer leader enumerators to extend a recruitment leaflet to MSM who were identified as 'on the market', that is, a man who admitted to selling sex to men. We captured men on two consecutive Saturdays, 1 week apart. A record was kept of when, where and by whom the invitation was extended and received, and of refusals. The total estimate of MSM who sell sex was derived from capture-recapture calculation.
Capture 1 included 284 men (following removal of 15 duplicates); 89 men refused to participate. Capture 2 included 484 men (following removal of 35 duplicates); 75 men refused to participate. Of the 484 men in capture 2, 186 were recaptures from capture 1, resulting in a total estimate of 739 (95% confidence interval, 690-798) MSM who sell sex in the study area.
We estimated that 739 MSM sell sex in and around Mombasa. Of these, 484 were contacted through trained peer enumerators in a single day. MSM who sell sex in and around Mombasa represent a sizeable population who urgently need to be targeted by HIV prevention strategies.
男男性行为者（MSM）极易感染艾滋病毒，但在撒哈拉以南非洲地区，这一人群特别难以接触到。我们旨在估算肯尼亚蒙巴萨及其周边地区从事性交易的男男性行为者的数量，以便规划艾滋病毒预防研究。
我们在蒙巴萨及其周边地区确定了77个潜在的男男性行为者接触地点，包括公共街道、公园、妓院、酒吧和夜总会，并培训了37名男男性行为者同伴领袖调查员，向被认定为“从事性交易”的男男性行为者发放招募传单，即承认与男性进行性交易的男性。我们在相隔1周的连续两个周六进行人员捕捉。记录下邀请发放和接收的时间、地点及人员，以及拒绝情况。从事性交易的男男性行为者的总估算数量通过捕获-再捕获计算得出。
第一次捕获包括284名男性（去除15名重复者后）；89名男性拒绝参与。第二次捕获包括484名男性（去除35名重复者后）；75名男性拒绝参与。在第二次捕获的484名男性中，有186名是第一次捕获的再捕获对象，研究区域内从事性交易的男男性行为者的总估算数量为739名（95%置信区间，690 - 798）。
我们估计蒙巴萨及其周边地区有739名男男性行为者从事性交易。其中，484名是通过经过培训的同伴调查员在一天内接触到的。在蒙巴萨及其周边地区从事性交易的男男性行为者是一个相当规模的群体，迫切需要成为艾滋病毒预防策略的目标人群。
