中文摘要：

目的了解北京市男男性行为者（men who have sex with men，MSM）艾滋病病毒（HIV）感染情况及其影响因素。方法于2006年9月-2007年2月，在北京市招募MSM进行问卷调查，调查内容包括社会人口学和高危行为学特征，采集血样检测HIV抗体。结果在所调查的541名MSM中，HIV和梅毒感染率分别为4．8％（26／541）和19．8％（107／541）。在多因素Logistic回归模型中，梅毒感染（OR=4．23；95％CI 1．88—9．54）、过去男性性伴总人数≥10个（OR=3．80，95％CI1．49—9．72）与MSM HIV感染的关系有统计学意义。结论MSM已成为HIV感染的高危人群之一，有必要加强艾滋病／性病防治知识宣传和预防干预，来降低HIV在MSM中的传播。

英文摘要：

Objective To investigate HIV infections and related factors among men who have sex with men（MSM）in Beijing. Methods Between September of 2006 and February of 2007,community-based samples of MSM were recruited. Interviewer-administered interviews were conducted to collect information on demographics and sexual and other risk behaviors in the past months,and blood samples were collected to test for HIV. Results Among 541 MSM investigated, prevalence rates of H IV and syphilis were 4.8 % （26/541 ） and 19.8 % （ 107/541 ） respectively. Multivariate logistic regression analyses demonstrated that syphilis infection（ OR = 4.23 ; 95 % CI 1.88 - 9.54） and the total number of lifetime male sex partners ≥10 in the past （ OR = 3.80,95% CI 1.49 - 9.72）were independently associated with HIV infections. Conclusion MSM is highly vulnerable to HIV transmission, and so it is urgent to provide MSMs with HIV/STDs related health education and preventive interventions.