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He X.,Centers for Disease Control and Prevention | Xing H.,Centers for Disease Control and Prevention | Ruan Y.,Centers for Disease Control and Prevention | Hong K.,Centers for Disease Control and Prevention | And 56 more authors.
PLoS ONE | Year: 2012

Background: China is experiencing a dynamic HIV/AIDS epidemic. While serology based surveillance systems have reported the spread of HIV/AIDS, detailed tracking of its transmission in populations and regions is not possible without mapping it at the molecular level. We therefore conducted a nationwide molecular epidemiology survey across the country. Methods: HIV-1 genotypes were determined from 1,408 HIV-positive persons newly diagnosed in 2006. The prevalence of each genotype was estimated by weighting the genotype's prevalence from each province- and risk-specific subpopulation with the number of reported cases in the corresponding subgroups in that year. Results: CRF07_BC (35.5%), CRF01_AE (27.6%), CRF08_BC (20.1%), and subtype B' (9.6%) were the four main HIV-1 strains in China. CRF07_BC and CRF08_BC were the primary drivers of infection among injecting drug users in northeastern and southeastern China, respectively, and subtype B' remained dominant among former plasma donors in central China. In contrast, all four strains occurred in significant proportions among heterosexuals nationwide, pointing to an expansion of the HIV-1 epidemic from high-risk populations into the general population. CRF01_AE also replaced subtype B as the principal driver of infection among men-who-have-sex-with-men. Conclusions: Our study provides the first comprehensive baseline data on the diversity and characteristics of HIV/AIDS epidemic in China, reflecting unique region- and risk group-specific transmission dynamics. The results provide information critical for designing effective prevention measures against HIV transmission. © 2012 He et al. Source

Dong Z.,Anhui Medical University | Xu J.,National Center for Control and Prevention | Zhang H.,Anhui Medical University | Dou Z.,National Center for Control and Prevention | And 22 more authors.
PLoS ONE | Year: 2014

Objectives: To assess HIV incidence and its associated risk factors among young men who have sex with men (YMSM) in urban areas, China. Design: The study used a prospective cohort study design and standard diagnostic tests. Methods: A twelve-month prospective cohort study was conducted among YMSM (18-25 years old) in 8 large cities in China. The participants were recruited via snowball sampling. A total of 1102 HIV-negative YMSM completed baseline assessment, 878 YMSM participants completed 6-month follow-up, and 902 completed 12-month follow-up. HIV was screened by an enzyme-linked immunosorbent assay and confirmed with Western Blot. Syphilis was screened via rapid plasma reagent and confirmed by treponema pallidum particle agglutination assay. Results: 78 HIV seroconversions were identified within 1168.4 person-year observations yielding an incidence rate of 6.7 per 100 person-years. HIV seroconversion was associated with non-student status (RR = 2.61, 90% CI = 1.3-5.26), low HIV transmission knowledge (RR = 8.87, 90% CI = 2.16-36.43), and syphilis infection (RR = 5.04, 90% CI = 2.57-9.90). Conclusions: Incidence of HIV among YMSM is high in urban areas of China. Interventions measures are required to contain the HIV epidemic within this population. © 2014 Dong et al. Source

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