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Prevalence and Factors Associated with Hepatitis B Immunization and Infection among Men Who Have Sex with Men (MSM) in Beijing, China Chao Wang 1,3, YouXin Wang 1,3, XiaoJie Huang 2, Xia Li 1,3, Tong Zhang 2, ManShu Song 1,3, LiJuan Wu 1,3, Juan Du 1,3, XiaoQin Lu 1,3, Shuang Shao 1,3, FeiFei Zhao 1,3, Michele A. Ball 4, Hao Wu 2,3, Wei Wang 1,3,5 1 School of Public Health , Capital Medical University, Beijing, China 2 Beijing YouAn Hospital, Capital Medical University 3 Beijing Municipal Key Laboratory of Clinical Epidemiology 4 Beijing University of Chinese Medicine 5 School of Medical Sciences, Edith Cowan University, Perth, Australia 1 Study Population Recruit • Web-based advertisements on websites targeting MSM in Beijing • Distribution of information leaflets by trained peer recruiters at MSM-frequented venues • Peer referral by current study participants 2 Data Collection ●Questionnaire-based survey ■demographic information ■sexual behavior information ■potential sexual or non-sexual risk factors for STD transmission ● Blood specimens were collected and tested for serologic markers of HBV, HIV, syphilis and HCV infections 3 HBV Laboratory Testing • Vaccine-associated immunity was defined by the sole presence of anti-HBs • Immunity due to natural infection (past infection) was defined by the presence of anti- HBc and anti-HBs with an absence of HBsAg • Susceptibility to HBV infection was defined as the complete absence of these three serologic markers • Total HBV infection was defined as the presence of HBsAg or anti-HBc