Analysis of HIV/AIDS sentinel surveillance in Hangzhou

Objective　This study was performed to determine the prevalence and risk factors of HIV in high-risk population, providing evidence for evaluating the effectiveness of HIV prevention and development of control strategies. Methods　In 2006, a total of 258 STD outpatients, 262 drug abusers and 250 sex workers were screened for HIV antibody by enzyme linked immunosorbent assay(ELISA) in Hangzhou. Results　The infection rates of HIV and syphilis among STD outpatients were 0.78% and 20.5%, respectively. 79.1% of subjects had extramarital sex activities the three months, but only 10.3% of them used condom each time. 45.3% of them suffered from other STDs. The infection rates of HIV and syphilis among drug abusers were 2.3% and 0.4%, respectively. 42.4% of used abusers had history of intravenous injection and 40.5% of them syringes sharing. 7.3% of these subjects used to have commercial sex activities but 36.8% of them had never used condoms during commercial sex; No HIV carrier was detected among the sex workers, whose infection rate of syphilis was 17.6%. Only 52.0％ of them used condoms each time in the past month when having sex with their clients. 1.2% of sex workers abused drugs without history of intravenous injection. Conclusion　The results of this surveillance indicate that HIV is prevalent among high-risk population such as drug abusers and STD outpatients with multiple risk factors associated with HIV transmission.