中文摘要：

目的：了解上海市部分男男性接触（MSM）人群人免疫缺陷病毒Ⅰ型（HIV-1）和梅毒感染现状及性行为特征。方法：访谈员在志愿者带领下，到MSM人群聚集场所，对符合条件的MSM进行一对一访谈。该人群在接受HIV、梅毒检测及调查性行为特征前签署知情同意书，并采集血液样本进行HIV-1抗体和梅毒检测。结果：在接受调查的203人中．HIV-1和梅毒的感染率分别为4.4％和10．3％；43.3％的调查对象与女性有性接触；其与男性偶然性伴安全套使用率高于与固定性伴：HIV-1和梅毒的感染情况与调查对象的文化程度和性伴数量有一定关系。结论：上海市MSM人群的HIV-1和梅毒感染率较高，需对其进行艾滋病防治强化教育和综合干预，以遏制HIV-1和梅毒在该人群中传播。

英文摘要：

Objective To understand the prevalence of HIV-1 and syphilis infection and characteristics of sexual behaviors in MSM （men who have sex with men） living in Shanghai. Methods Epidemiological survey information was collected from 203 MSM by trained interviewers under the help of MSM volunteers. After obtaining informed consent, blood samples were taken for HIV-1 antibody tests and syphilis tests. Results Nine （4.4%） and twenty-one （10.3%） of the MSM were infected with HIV-1 and syphilis, respectively. Eighty-eight （43.3 %） also had sex with women. The rate of condom use was higher when having sexual behavior with casual sexual partners than with regular male partners. Infection of HIV-1 and syphilis had close correlation with educational background and number of sexual partners. Conclusions The prevalence of HIV-1 and syphilis is relatively high in MSM living in Shanghai. Intensive education on prevention of sexual transmitted disease and comprehensive behavioral interferences are urgently needed for the prevention of spreading of HIV-1 and syphilis in MSM.