Methods: The blood sample from the MSMs in target site and those who come to Voluntary Counselling and Testing was collected to take HIV, Syphilis and HCV test, through convenience sampling.

• 方法：通过自愿咨询检测和在某MSM聚集的酒吧采取方便抽样的方法对目标人群采集静脉血进行HIV、梅毒及HCV检测。