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Prevalence and factors associated with hepatitis B immunization and infection among men who have sex with men in Beijing, China. PLoS One 2012; 7:e48219. [PMID: 23133573 PMCID: PMC3485055 DOI: 10.1371/journal.pone.0048219] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Accepted: 09/26/2012] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Among the Chinese population of 1.3 billion, there are an estimated 93 million carriers of hepatitis B virus (HBV). Men who have sex with men (MSM) are at increased risk for HBV infection; however, the prevalence of HBV immunization and infection among Chinese MSM remains undetermined. METHODS A cross-sectional survey of 1,114 eligible participants was conducted in Beijing, China. Multiple methods were used to recruit study participants. Demographic information and potential correlated factors were collected by questionnaire. Additionally, blood specimens were collected and tested for sexually transmitted infections and serologic markers of hepatitis B immunization and infection. RESULTS Laboratory data were available for 1,111 participants (99.7%), the prevalence of hepatitis B immunization was 38.9%, and 26.5% had serologic markers of HBV infection. Multivariate analyses indicated that higher education level, smaller number of male sex partners in the past 12 months, reported diagnosis of sexually transmitted disease (STD), and history of blood donation were independently associated with HBV immunization. Absence of steady male sex partner(s) in the past 12 months, and reported diagnosis of STD were shown to be independently associated with HBV infection. MSM positive for HBV infection were more likely to have past or current syphilis infection. CONCLUSIONS Low prevalence of HBV immunization and high prevalence of HBV infection among Chinese MSM and a correlation between sexual risk factors and hepatitis B infection indicate that comprehensive preventative measures for HBV among MSM, including blood donor and HIV-STD clinic vaccination programs as well as targeted health education campaigns should be developed in China.
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HIV disclosure and sexual transmission behaviors among an Internet sample of HIV-positive men who have sex with men in Asia: implications for prevention with positives. AIDS Behav 2012; 16:1970-8. [PMID: 22198313 DOI: 10.1007/s10461-011-0105-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The relationship between HIV disclosure and sexual transmission behaviors, and factors that influence disclosure are unknown among HIV-positive men who have sex with men (MSM) in Asia. We describe disclosure practices and sexual transmission behaviors, and correlates of disclosure among this group of MSM in Asia. A cross-sectional multi-country online survey was conducted among 416 HIV-positive MSM. Data on disclosure status, HIV-related risk behaviors, disease status, and other characteristics were collected. Multivariable logistic regression was used to identify significant correlates of disclosure. Only 7.0% reported having disclosed their HIV status to all partners while 67.3% did not disclose to any. The majority (86.5%) of non-disclosing participants had multiple partners and unprotected insertive or receptive anal intercourse with their partners (67.5%). Non-disclosure was significantly associated with non-disclosure from partners (AOR = 37.13, 95% CI: 17.22, 80.07), having casual partners only (AOR = 1.91, 95% CI: 1.03, 3.53), drug use before sex on a weekly basis (AOR: 6.48, 95% CI: 0.99, 42.50), being diagnosed with HIV between 1 and 5 years ago (AOR = 2.23, 95% CI: 1.05, 4.74), and not knowing one's viral load (AOR = 2.80, 95% CI: 1.00, 7.83). Given the high HIV prevalence and incidence among MSM in Asia, it is imperative to include Prevention with Positives for MSM. Interventions on disclosure should not solely focus on HIV-positive men but also need to include their sexual partners and HIV-negative men.
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Zhang L, Chow EPF, Wilson DP. Distributions and trends in sexual behaviors and HIV incidence among men who have sex with men in China. BMC Public Health 2012; 12:546. [PMID: 22828173 PMCID: PMC3507867 DOI: 10.1186/1471-2458-12-546] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Accepted: 07/10/2012] [Indexed: 12/05/2022] Open
Abstract
Background HIV prevalence is increasing at a concerning rate among men who have sex with men (MSM) in China. Numerous studies have reported on levels of behaviors of Chinese MSM for different types of sexual partnerships, such as regular, non-commercial casual and commercial. This study aims to investigate the trends HIV incidence rates in relation to their risk sexual behaviors and partnership types among Chinese MSM. Method Through a comprehensive literature research from available English and Chinese literature databases, we collated relevant information of sexual behaviors of Chinese MSM. Further, with the utilization of a mathematical optimization approach, this study reconciles the distributions of sexual behavioral data over the last decade and infers the heterogeneous distributions of behavioral patterns among Chinese MSM. Distributions of high-risk behavioural indicators, including the number of sexual partners, number of sexual acts and condom usage in the past 6 months, are calibrated to available empirical data. Based on the resultant temporal trends in these distributions, the trends in HIV incidence rates associated with each type of partnership among MSM in China are also estimated. Results A total of 55 qualified articles have been identified. An average MSM has approximately 0.96 (95% CI, 0.59-1.18) regular, 3.75 (1.72-6.25) casual and 1.61 (0.97-2.78) commercial partners over a 6 month period and 4.33 (2.81-6.46), 1.42 (0.62-3.08), 1.48 (0.79-3.30) sexual acts per partnership respectively, corresponding to a total of 11.87 (8.87-15.25) acts. Condom usage has increased significantly during 2002–2010, at annual increases of 3.58% (2.98-4.12%), 5.55% (4.55-6.54%), and 5.03% (4.19-5.74%) for regular, casual and commercial partners respectively. These behavioral data implies an increase in HIV incidence of approximately 3.3-fold, from 2.04 (1.96-2.12) to 7.02 (6.71-7.35) per 1000 person-years during the same period. The proportion of new infections attributed to regular partnerships increased from 34% to 40%, whereas infections attributed to commercial partnerships reduced from 29% to 23% during 2002–2010. Conclusion Regular partnerships are the main contributor of new HIV cases among MSM in China, public health intervention strategies are required to increase condom usage and HIV testing rates among regular partners to curb the growing trend HIV incidence.
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Affiliation(s)
- Lei Zhang
- The Kirby Institute, University of New South Wales, Sydney, NSW 2052, Australia
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Hao C, Huan X, Yan H, Yang H, Guan W, Xu X, Zhang M, Wang N, Tang W, Gu J, Lau JTF. A randomized controlled trial to evaluate the relative efficacy of enhanced versus standard voluntary counseling and testing on promoting condom use among men who have sex with men in China. AIDS Behav 2012; 16:1138-47. [PMID: 22298340 DOI: 10.1007/s10461-012-0141-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
The randomized controlled trial investigated the relative efficacy of an enhanced (EVCT) versus standard (SVCT) voluntary counseling and testing in reducing unprotected anal intercourse (UAI) among men who have sex with men (MSM) in China. 295 participants who recruited by respondent driven sampling methods were randomly allocated to the two arms. In addition to the SVCT, the EVCT group watched a theory-based video narrated by a HIV positive MSM, received enhanced counseling and a reminder gift. As compared to the SVCT group, the EVCT group reported lower prevalence of UAI with any male sex partners (48.4% versus 66.7%, RR = 0.7, ARR = -18.3%, p = 0.010) and with regular male sex partners (52.2% versus 68.9%, RR = 0.8, ARR = -16.7%, p = 0.043) at Month 6, whilst baseline between-group differences were statistically non-significant. Between-group differences in HIV/syphilis incidence were statistically non-significant. Translational research should be conducted to integrate non-intensive enhancements such as the EVCT into regular testing services.
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55
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Huang ZJ, He N, Nehl EJ, Zheng T, Smith BD, Zhang J, McNabb S, Wong FY. Social network and other correlates of HIV testing: findings from male sex workers and other MSM in Shanghai, China. AIDS Behav 2012; 16:858-71. [PMID: 22223298 PMCID: PMC8080277 DOI: 10.1007/s10461-011-0119-4] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
Although the Chinese government provides free-of-charge voluntary HIV counseling and testing, HIV testing rates among men who have sex with men (MSM) are reported to be extremely low. This study examines the association of structural and psychosocial factors and social network characteristics with HIV testing behaviors among "money boys" and general MSM in Shanghai. Overall, 28.5% of "money boys" and 50.5% of general MSM had never tested for HIV despite high rates of reported HIV risk behaviors. Factors associated with not testing for HIV included: not knowing of a testing site, limited HIV knowledge, low perceived HIV risk, concern about HIV testing confidentiality, being a closeted gay, not using the Internet, and having a small social network or network with few members who had tested for HIV. Future efforts to promote HIV testing should focus on outreach to general MSM, confidentiality protection, decreasing the stigma of homosexuality, and encouraging peer education and support through the Internet and social networks.
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Affiliation(s)
- Z Jennifer Huang
- Department of International Health, Georgetown University School of Nursing and Health Studies, Washington, DC 20057, USA.
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56
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Yan H, Yang H, Zhao J, Wei C, Li J, Huan X, Zhang M, Raymond HF, McFarland W. Long-chain peer referral of men who have sex with men: a novel approach to establish and maintain a cohort to measure HIV incidence, Nanjing, China. J Acquir Immune Defic Syndr 2012; 59:177-84. [PMID: 21992923 DOI: 10.1097/qai.0b013e318239c947] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND HIV prevalence is high among men who have sex with men (MSM) in China. Longitudinal studies are needed to measure HIV incidence, determine causes of acquisition, and test prevention interventions. We described 2 novel methods to enroll and maintain a cohort of MSM, focusing on their abilities to establish a diverse sample, improve retention, and their impact on HIV incidence. METHODS Employing methods based on respondent-driving sampling, we constructed 2 parallel cohorts measuring HIV incidence over 2 years through 6-month follow-up visits. An initial cohort was constructed using long-chain peer referral from the community; a second phase comprised open cohort peer referral recruitment from MSM completing follow-up. RESULTS Three-hundred ninety-seven HIV-negative MSM were enrolled in the initial cohort; 460 were recruited in the open cohort phase. Across recruitment waves, the composition of the cohort was stable. Among initial participants, retention was 72.0%, 68.8%, 49.9%, and 44.8%. Retention was lower in the open cohort. MSM retained in both phases were less risky than those lost to follow-up. HIV incidence was 3.36 per 100 person-years and did not differ by recruitment method. CONCLUSIONS Our approach efficiently recruited MSM into longitudinal studies with modest improvement in sample diversity from initial recruits. We perceive multiple means to improve diversity and follow-up capitalizing on the network bonds between recruits and through secondary incentives for assistance with referral and retention. Meanwhile, HIV incidence is high among MSM in Nanjing, and interventions need to be developed and tested in longitudinal randomized controlled trials.
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Affiliation(s)
- Hongjing Yan
- Jiangsu Provincial Center for Diseases Control and Prevention, Nanjing, China
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57
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Fan S, Lu H, Ma X, Sun Y, He X, Li C, Raymond H, McFarland W, Sun J, Ma W, Jia Y, Xiao Y, Shao Y, Ruan Y. Behavioral and serologic survey of men who have sex with men in Beijing, China: implication for HIV intervention. AIDS Patient Care STDS 2012; 26:148-55. [PMID: 22248333 DOI: 10.1089/apc.2011.0277] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We assessed HIV prevalence and associated behaviors and risk factors among men who have sex with men (MSM) in Beijing, China. Five hundred MSM were recruited for a biological and behavioral survey using respondent-driven sampling (RDS) in 2009. Serologic specimens were tested for markers of HIV and syphilis infection. A computer-assisted personal interview (CAPI) administered questionnaire gathered information including demographic characteristics, sexual behaviors, HIV testing, and social norms concerning condom use. The adjusted HIV prevalence was 8.0%, syphilis 22.0%. HIV testing and disclosure was low; only 39.3% had HIV tested in the past 12 months, 49.7% knew their own HIV status and 22.8% knew their last male partner's HIV status. HIV infection was associated with syphilis, ever having sex with a woman, not knowing the HIV status of the most recent male partner, and never buying condoms in the past 12 months. Stronger endorsement of positive social norms around condom use strongly and predicted lower prevalence of HIV infection. Compared to surveys of similar design in the recent past, HIV continues to spread rapidly among Beijing's MSM. Our results identify points of intervention that, if addressed in time, may still alter the course of the epidemic including the promotion of HIV testing and partner disclosure, syphilis control and particularly changing social norms around condom use.
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Affiliation(s)
- Song Fan
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, P. R. China
| | - Hongyan Lu
- Beijing Center for Disease Control and Prevention, Beijing, P. R. China
| | - Xiaoyan Ma
- Beijing Center for Disease Control and Prevention, Beijing, P. R. China
| | - Yanming Sun
- Beijing Center for Disease Control and Prevention, Beijing, P. R. China
| | - Xiong He
- Beijing Center for Disease Control and Prevention, Beijing, P. R. China
| | - Chunmei Li
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, P. R. China
| | - H.F. Raymond
- San Francisco Department of Public Health, San Francisco, California
| | - Willi McFarland
- San Francisco Department of Public Health, San Francisco, California
- Department of Epidemiology and Biostatistics, University of California, San Francisco, California
| | - Jiangping Sun
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, P. R. China
| | - Wei Ma
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, P. R. China
| | - Yujiang Jia
- Institute for Global Health, Vanderbilt University School of Medicine, Nashville, Tennessee
- Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, Tennessee
| | - Yan Xiao
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, P. R. China
| | - Yiming Shao
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, P. R. China
| | - Yuhua Ruan
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, P. R. China
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58
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Tucker JD, Yin YP, Wang B, Chen XS, Cohen MS. An expanding syphilis epidemic in China: epidemiology, behavioural risk and control strategies with a focus on low-tier female sex workers and men who have sex with men. Sex Transm Infect 2012; 87 Suppl 2:ii16-8. [PMID: 22110145 PMCID: PMC3306605 DOI: 10.1136/sti.2010.048314] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- Joseph D Tucker
- Division of Infectious Diseases, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA
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59
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Li D, Li S, Liu Y, Gao Y, Yu M, Yang X, Li Q, Jiang S, Zhou Z, Zhang Z, Yan L, Jiang G, Xiao D, Pan SW, Luo F, Ruan Y, Shao Y. HIV incidence among men who have sex with men in Beijing: a prospective cohort study. BMJ Open 2012; 2:bmjopen-2012-001829. [PMID: 23166133 PMCID: PMC3533041 DOI: 10.1136/bmjopen-2012-001829] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
OBJECTIVES (1) To assess the HIV incidence rate among men who have sex with men (MSM) in a large cohort study in Beijing, China and (2) to identify sociodemographic and behavioural risk factors of HIV seroconversion among MSM in Beijing, China. DESIGN A prospective cohort study. SETTING Baseline and follow-up visits were conducted among MSM in Beijing, China. PARTICIPANTS A cohort of 797 HIV-seronegative MSM was recruited from August to December 2009, with follow-up occurring after 6 and 12 months. PRIMARY AND SECONDARY OUTCOME MEASURES At baseline and follow-up visits, participants reported sociodemographic and sexual behaviour information, and were tested for HIV, herpes simplex virus-2 (HSV-2) and syphilis with whole blood specimens. Cox regression analysis was used to identify factors associated with HIV seroconversion. RESULTS Most study participants (86.8%) were retained by the 12-month follow-up. The HIV, HSV-2 and syphilis incidence rates were 8.09 (95% CI 6.92 to 9.26), 5.92 (95% CI 5.44 to 6.40) and 8.06 (95% CI 7.56 to 8.56) cases per 100 person-years, respectively. HIV seroconversion was significantly associated with being <25 years old, having <12 years of education, having >1 male sex partner in the past 6 months, and being syphilis positive or HSV-2 positive. CONCLUSIONS The HIV incidence among MSM in Beijing is serious. Interventions and treatment of sexually transmitted diseases (STD) should be combined with HIV control and prevention measures among MSM.
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Affiliation(s)
- Dongliang Li
- Chaoyang Center for Disease Control and Prevention, Beijing, PR China
| | - Shuming Li
- Chaoyang Center for Disease Control and Prevention, Beijing, PR China
| | - Yingjie Liu
- Chaoyang Center for Disease Control and Prevention, Beijing, PR China
| | - Yanjie Gao
- Chaoyang Center for Disease Control and Prevention, Beijing, PR China
| | - Mingrun Yu
- Chaoyang Center for Disease Control and Prevention, Beijing, PR China
| | - Xueying Yang
- Chaoyang Center for Disease Control and Prevention, Beijing, PR China
| | - Qingchun Li
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, PR China
| | - Shulin Jiang
- Chaoyang Center for Disease Control and Prevention, Beijing, PR China
| | - Zhenhai Zhou
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, PR China
| | - Zheng Zhang
- Chaoyang Center for Disease Control and Prevention, Beijing, PR China
| | - Li Yan
- Beijing Jingcheng Skin Diseases Hospital, Beijing, PR China
| | - Guiyan Jiang
- Beijing Jingcheng Skin Diseases Hospital, Beijing, PR China
| | - Dong Xiao
- Chaoyang Chinese AIDS Volunteer Group, Beijing, PR China
| | - Stephen W Pan
- The School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada
| | - Fengji Luo
- Chaoyang Center for Disease Control and Prevention, Beijing, PR China
| | - Yuhua Ruan
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, PR China
| | - Yiming Shao
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, PR China
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60
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Zhang L, Qian HZ, Blevins ML, Yin L, Ruan Y, Vermund SH. Internet-based behavioral interventions for preventing HIV infection in men who have sex with men (MSM). Hippokratia 2011. [DOI: 10.1002/14651858.cd009525] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Lan Zhang
- Vanderbilt University; Institute for Global Health; Nashville Tennessee USA 37203
| | - Han-zhu Qian
- Vanderbilt University; Institute for Global Health; Nashville Tennessee USA 37203
| | - Meridith L Blevins
- Vanderbilt University; Department of Biostatistics; Nashville Tennessee USA 37232
| | - Lu Yin
- Vanderbilt University; Institute for Global Health; Nashville Tennessee USA 37203
| | - Yuhua Ruan
- National Centre for AIDS/STD Control and Prevention (NCAIDS), China CDC; Beijing China 100050
| | - Sten H Vermund
- Vanderbilt University; Institute for Global Health; Nashville Tennessee USA 37203
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Wang K, Yan H, Liu Y, Leng Z, Wang B, Zhao J. Increasing prevalence of HIV and syphilis but decreasing rate of self-reported unprotected anal intercourse among men who had sex with men in Harbin, China: results of five consecutive surveys from 2006 to 2010. Int J Epidemiol 2011; 41:423-32. [DOI: 10.1093/ije/dyr182] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Kong TSK, Laidler KJ, Pang H. Relationship type, condom use and HIV/AIDS risks among men who have sex with men in six Chinese cities. AIDS Care 2011; 24:517-28. [PMID: 22084891 DOI: 10.1080/09540121.2011.617411] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
This study is the first to examine the role of partner type in sexual practices of men who have sex with men (MSM) in China. Using cross-sectional self-administered questionnaires (N=692) with MSM in six Chinese cities (Shanghai, Guangzhou, Shenzhen, Xi'an, Dalian and Beijing) in 2008, this paper examines MSM's sexual practices, particularly condom use with different male and female partner types. We categorise sexual partner relationships into five types: partner/spouse, boyfriend/girlfriend, acquaintance, stranger and sex worker and hypothesise that the greater the affective distance between the partners, the greater the likelihood of engaging with intimate act and the lesser likelihood condom use. Results show that respondents had more MSM than heterosexual experiences. Relationships tended to be short-term, multiple (more than two) and concurrent (simultaneously two or more) principally with other men and to a lesser degree with women. Findings reveal that affective distance varied with partner types. Respondents performed more intimate acts (e.g., kissing, caressing) with intimate or stable partners (partner/spouse, boyfriend/girlfriend) than casual or unknown partners (acquaintance, stranger, sex worker). Condom use decreased when the affective distance with a partner increased. We conclude that partner type is a key factor of HIV infection among MSM in China; short-term, multiple and concurrent relationships are clear risk factors. Future research should focus on the subjective varied meanings of relationships, the idea of trust and the dynamics with different relationships to understand HIV infection of MSM in China.
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Affiliation(s)
- Travis S K Kong
- Department of Sociology, The University of Hong Kong, Pokfulam, Hong Kong.
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63
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Zhang M, Chu Z, Wang H, Xu J, Lu C, Shang H. A rapidly increasing incidence of HIV and syphilis among men who have sex with men in a major city of China. AIDS Res Hum Retroviruses 2011; 27:1139-40. [PMID: 21388334 DOI: 10.1089/aid.2010.0356] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Min Zhang
- Key Laboratory of AIDS Immunology of Ministry of Health, Department of Laboratory Medicine, No. 1 Hospital of China Medical University, Shenyang, China
| | - Zhenxing Chu
- Key Laboratory of AIDS Immunology of Ministry of Health, Department of Laboratory Medicine, No. 1 Hospital of China Medical University, Shenyang, China
| | - Hailong Wang
- Key Laboratory of AIDS Immunology of Ministry of Health, Department of Laboratory Medicine, No. 1 Hospital of China Medical University, Shenyang, China
| | - Junjie Xu
- Key Laboratory of AIDS Immunology of Ministry of Health, Department of Laboratory Medicine, No. 1 Hospital of China Medical University, Shenyang, China
| | - Chunming Lu
- Center for Disease Control and Prevention, Liaoning Province, Shenyang, China
| | - Hong Shang
- Key Laboratory of AIDS Immunology of Ministry of Health, Department of Laboratory Medicine, No. 1 Hospital of China Medical University, Shenyang, China
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Abstract
PURPOSE OF REVIEW The present review discusses the recent finding on behavioral risk factors for HIV transmission from cohort studies in MSM. RECENT FINDINGS HIV incidence among MSM has been increasing in many countries around the world. Some data support early detection and widespread use of antiretroviral treatment (ART) to decrease HIV incidence. However, suboptimal ART adherence could lead to relapse of viremia and new transmission events. Condom use for unprotected anal sex among MSM remains an important prevention tool, but use remains low in many parts of the world. Seroadaptive behaviors by MSM, such as serosorting, may also decrease condom use. However, when serosorting is practiced by MSM who receive frequent HIV testing, the risk of HIV acquisition is reduced. Serosorting and other characteristics of sexual networks, such as concurrency, may be major determinants of transmission for HIV and sexually transmitted infections among MSM. Worldwide, detailed evaluation of the factors related to rising MSM HIV incidence, as well as access to testing and care, is limited by stigma and criminalization of HIV and homosexuality. SUMMARY Cohort studies of MSM remain an important strategy to characterize the behavioral factors that drive HIV transmission and how use of ART for prevention and treatment may affect both the risk of HIV transmission and acquisition by MSM.
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65
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Li HM, Peng RR, Li J, Yin YP, Wang B, Cohen MS, Chen XS. HIV incidence among men who have sex with men in China: a meta-analysis of published studies. PLoS One 2011; 6:e23431. [PMID: 21887251 PMCID: PMC3162552 DOI: 10.1371/journal.pone.0023431] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2011] [Accepted: 07/17/2011] [Indexed: 12/03/2022] Open
Abstract
Background Men who have sex with men (MSM) have now become one of the priority populations for prevention and control of HIV pandemic in China. Information of HIV incidence among MSM is important to describe the spreading of the infection and predict its trends in this population. We reviewed the published literature on the incidence of HIV infection among MSM in China. Methods We identified relevant studies by use of a comprehensive strategy including searches of Medline and two Chinese electronic publication databases from January 2005 to September 2010. Point estimate of random effects incidence with corresponding 95% confidence intervals (CI) of HIV infection was carried out using the Comprehensive Meta-Analysis software. Subgroup analyses were examined separately, stratified by study design and geographic location. Results Twelve studies were identified, including three cohort studies and nine cross-sectional studies. The subgroup analyses revealed that the sub-overall incidence estimates were 3.5% (95% CI, 1.7%–5.3%) and 6.7% (95% CI, 4.8%–8.6%) for cohort and cross-sectional studies, respectively (difference between the sub-overalls, Q = 5.54, p = 0.02); and 8.3% (95% CI, 6.9%–9.7%) and 4.6% (95% CI, 2.4%–6.9%) for studies in Chongqing and other areas, respectively (difference between the sub-overalls, Q = 7.58, p<0.01). Syphilis infection (RR = 3.33, p<0.001), multiple sex partnerships (RR = 2.81, p<0.001), and unprotected receptive anal intercourse in the past six months (RR = 3.88, p = 0.007) represented significant risk for HIV seroconversion. Conclusions Findings from this meta-analysis indicate that HIV incidence is substantial in MSM in China. High incidence of HIV infection and unique patterns of sexual risk behaviors in this population serve as a call for action that should be answered with the innovative social and public health intervention strategies, and development of biological prevention strategies.
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Affiliation(s)
- Hong-Min Li
- Chinese Academy of Medical Sciences Institute of Dermatology, Nanjing, China
| | - Rui-Rui Peng
- Chinese Academy of Medical Sciences Institute of Dermatology, Nanjing, China
| | - Jing Li
- Chinese Academy of Medical Sciences Institute of Dermatology, Nanjing, China
| | - Yue-Ping Yin
- Chinese Academy of Medical Sciences Institute of Dermatology, Nanjing, China
- China Center for Disease Control and Prevention, National Center for STD Control, Nanjing, China
| | - Baoxi Wang
- Chinese Academy of Medical Sciences Institute of Dermatology, Nanjing, China
- China Center for Disease Control and Prevention, National Center for STD Control, Nanjing, China
| | - Myron S. Cohen
- Center of Infectious Diseases, University of North Carolina School of Medicine, Chapel Hill, North Carolina, United States of America
| | - Xiang-Sheng Chen
- Chinese Academy of Medical Sciences Institute of Dermatology, Nanjing, China
- China Center for Disease Control and Prevention, National Center for STD Control, Nanjing, China
- * E-mail:
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66
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Chow EPF, Wilson DP, Zhang L. HIV and syphilis co-infection increasing among men who have sex with men in China: a systematic review and meta-analysis. PLoS One 2011; 6:e22768. [PMID: 21857952 PMCID: PMC3156129 DOI: 10.1371/journal.pone.0022768] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2011] [Accepted: 06/29/2011] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND This study aims to estimate the magnitude and changing trends of HIV, syphilis and HIV-syphilis co-infections among men who have sex with men (MSM) in China during 2003-2008 through a systematic review of published literature. METHODOLOGY/PRINCIPAL FINDINGS Chinese and English literatures were searched for studies reporting HIV and syphilis prevalence among MSM from 2003 to 2008. The prevalence estimates were summarized and analysed by meta-analyses. Meta-regression was used to identify the potential factors that are associated with high heterogeneities in meta-analysis. Seventy-one eligible articles were selected in this review (17 in English and 54 in Chinese). Nationally, HIV prevalence among MSM increased from 1.3% during 2003-2004 to 2.4% during 2005-2006 and to 4.7% during 2007-2008. Syphilis prevalence increased from 6.8% during 2003-2004 to 10.4% during 2005-2006 and to 13.5% during 2007-2008. HIV-syphilis co-infection increased from 1.4% during 2005-2006 to 2.7% during 2007-2008. Study locations and study period are the two major contributors of heterogeneities of both HIV and syphilis prevalence among Chinese MSM. CONCLUSIONS/SIGNIFICANCE There have been significant increases in HIV and syphilis prevalence among MSM in China. Scale-up of HIV and syphilis screening and implementation of effective public health intervention programs should target MSM to prevent further spread of HIV and syphilis infection.
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Affiliation(s)
- Eric P. F. Chow
- The Kirby Institute for Infection and Immunity in Society, Faculty of Medicine, University of New South Wales, Sydney, Australia
| | - David P. Wilson
- The Kirby Institute for Infection and Immunity in Society, Faculty of Medicine, University of New South Wales, Sydney, Australia
| | - Lei Zhang
- The Kirby Institute for Infection and Immunity in Society, Faculty of Medicine, University of New South Wales, Sydney, Australia
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67
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Lau JTF, Lin C, Hao C, Wu X, Gu J. Public health challenges of the emerging HIV epidemic among men who have sex with men in China. Public Health 2011; 125:260-5. [PMID: 21658537 DOI: 10.1016/j.puhe.2011.01.007] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/24/2011] [Indexed: 10/18/2022]
Abstract
A large-scale national survey was conducted in 2008 across 61 cities throughout China, covering over 18,000 men who have sex with men (MSM). The prevalence of human immunodeficiency virus (HIV) was 4.9% and incidence ranged from 2.6 to 5.4 per 100 person-years. The prevalence of sexually transmitted diseases ranged from 2.0% to 29.9% among MSM in different parts of China. Syphilis status, recruitment of sexual partners mainly from gay saunas, duration of MSM experience, and unprotected sex with regular male sex partners and multiple male sex partners predicted HIV seroconversion. The prevalence of consistent condom use was low during anal sex, ranging from 29.4% to 37.3%. Within this context, this paper considers the factors surrounding HIV prevention activity, and identifies a number of public health challenges which need to be considered if optimum outcomes are to be achieved. HIV prevention targeting MSM is a delayed response. The high risk associated with gay saunas and the need for steady condom supply at these venues needs urgent consideration. In addition, approximately one-third of MSM in China reported bisexual behavior, which may be attributed to sociocultural reasons and stigma against MSM. Female sex partners of MSM are seldom aware of their exposure to high risk of HIV transmission. Finally, the primitive nature of non-government organizations for HIV prevention and issues around their sustainability pose another serious challenge for the future of HIV prevention campaigns targeting MSM in China.
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Affiliation(s)
- J T F Lau
- Centre for Health Behaviours Research, School of Public Health and Primary Care, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China.
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68
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Lau JT, Cai W, Tsui HY, Chen L, Cheng J, Lin C, Gu J, Hao C. Unprotected anal intercourse behavior and intention among male sex workers in Shenzhen serving cross-boundary male clients coming from Hong Kong, China – prevalence and associated factors. AIDS Care 2011; 24:59-70. [DOI: 10.1080/09540121.2011.592813] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Joseph T.F. Lau
- a Centre for Health Behaviors Research, School of Public Health and Primary Care , The Chinese University of Hong Kong , Hong Kong , China
- b Centre for Medical Anthropology and Behavioral Health , Sun Yat-sen University , Guangzhou , China
| | - Wende Cai
- c Shenzhen Center for Disease Control and Prevention , Guangdong , China
| | - Hi Yi Tsui
- a Centre for Health Behaviors Research, School of Public Health and Primary Care , The Chinese University of Hong Kong , Hong Kong , China
| | - Lin Chen
- c Shenzhen Center for Disease Control and Prevention , Guangdong , China
| | - Jinquan Cheng
- c Shenzhen Center for Disease Control and Prevention , Guangdong , China
| | - Chunqing Lin
- a Centre for Health Behaviors Research, School of Public Health and Primary Care , The Chinese University of Hong Kong , Hong Kong , China
| | - Jing Gu
- d Department of Medical Statistics and Epidemiology, School of Public Health , Sun Yat-sen University , Guangzhou , China
| | - Chun Hao
- d Department of Medical Statistics and Epidemiology, School of Public Health , Sun Yat-sen University , Guangzhou , China
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69
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Tan NX, Messina JP, Yang LG, Yang B, Emch M, Chen XS, Cohen MS, Tucker JD. A spatial analysis of county-level variation in syphilis and gonorrhea in Guangdong Province, China. PLoS One 2011; 6:e19648. [PMID: 21573127 PMCID: PMC3089632 DOI: 10.1371/journal.pone.0019648] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Accepted: 04/06/2011] [Indexed: 11/18/2022] Open
Abstract
Background Sexually transmitted infections (STI) have made a resurgence in many rapidly developing regions of southern China, but there is little understanding of the social changes that contribute to this spatial distribution of STI. This study examines county-level socio-demographic characteristics associated with syphilis and gonorrhea in Guangdong Province. Methods/Principal Findings This study uses linear regression and spatial lag regression to determine county-level (n = 97) socio-demographic characteristics associated with a greater burden of syphilis, gonorrhea, and a combined syphilis/gonorrhea index. Data were obtained from the 2005 China Population Census and published public health data. A range of socio-demographic variables including gross domestic product, the Gender Empowerment Measure, standard of living, education level, migrant population and employment are examined. Reported syphilis and gonorrhea cases are disproportionately clustered in the Pearl River Delta, the central region of Guangdong Province. A higher fraction of employed men among the adult population, higher fraction of divorced men among the adult population, and higher standard of living (based on water availability and people per room) are significantly associated with higher STI cases across all three models. Gross domestic product and gender inequality measures are not significant predictors of reported STI in these models. Conclusions/Significance Although many ecological studies of STIs have found poverty to be associated with higher reported STI, this analysis found a greater number of reported syphilis cases in counties with a higher standard of living. Spatially targeted syphilis screening measures in regions with a higher standard of living may facilitate successful control efforts. This analysis also reinforces the importance of changing male sexual behaviors as part of a comprehensive response to syphilis control in China.
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Affiliation(s)
- Nicholas X. Tan
- Harvard University, Cambridge, Massachusetts, United States of America
| | - Jane P. Messina
- Department of Geography, University of North Carolina, Chapel Hill, North Carolina, United States of America
| | - Li-Gang Yang
- Guangdong Provincial STI Control Center, Guangzhou, China
- * E-mail: (L-GY); (JDT)
| | - Bin Yang
- Guangdong Provincial STI Control Center, Guangzhou, China
| | - Michael Emch
- Department of Geography, University of North Carolina, Chapel Hill, North Carolina, United States of America
| | | | - Myron S. Cohen
- Division of Infectious Diseases, University of North Carolina School of Medicine, Chapel Hill, North Carolina, United States of America
| | - Joseph D. Tucker
- Harvard University, Cambridge, Massachusetts, United States of America
- Guangdong Provincial STI Control Center, Guangzhou, China
- Division of Infectious Diseases, University of North Carolina School of Medicine, Chapel Hill, North Carolina, United States of America
- * E-mail: (L-GY); (JDT)
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70
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Gu J, Lau JTF, Tsui H. Psychological factors in association with uptake of voluntary counselling and testing for HIV among men who have sex with men in Hong Kong. Public Health 2011; 125:275-82. [PMID: 21419466 DOI: 10.1016/j.puhe.2011.01.010] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/24/2011] [Indexed: 11/15/2022]
Abstract
OBJECTIVES To investigate the prevalence and factors associated with uptake of voluntary counselling and testing (VCT) for human immunodeficiency virus (HIV) among men who have sex with men (MSM) in Hong Kong. STUDY DESIGN Cross-sectional study. METHODS A total of 389 MSM were recruited from gay venues. An additional 188 MSM were recruited through the Internet. Data were collected via face-to-face interviews using a self-administered anonymous questionnaire or via an electronic questionnaire accessible via local gay-friendly websites. The associations between independent and dependent variables (VCT uptake in lifetime and in last 12 months) were examined by logistic regression models. RESULTS The prevalence rates for lifetime and 12-month uptake of VCT were 56.5% and 39.4%, respectively. Adjusting for significant background variables, all cognitive variables (attitudes, subjective norms, perceived control and behavioural intention) that were derived from the Theory of Planned Behaviours (TPB) were significantly associated with both lifetime and 12-month uptake of VCT [adjusted odds ratio (AOR) 0.56-4.71, P < 0.05]. Perceived fear of contracting HIV and perceived discrimination towards local MSM were associated with a lower likelihood of 12-month uptake of VCT (AOR 0.63, P < 0.05) and lifetime uptake (AOR 0.65, P < 0.05). In the summary models, variables derived from the TPB (subjective norms, perceived control and behavioural intention) were independently associated with lifetime and 12-month uptake of VCT (OR 0.64-2.78, P < 0.05; OR 2.39-3.21, P < 0.05, respectively). Fear of contracting HIV was associated with VCT uptake in the last 12 months (OR 0.55, P < 0.05). CONCLUSIONS Psychological factors are associated with VCT uptake. The TPB and other health behavioural theories should be taken into account when designing VCT promotion campaigns.
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Affiliation(s)
- J Gu
- Department of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, China
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71
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Tucker JD, Cohen MS. China's syphilis epidemic: epidemiology, proximate determinants of spread, and control responses. Curr Opin Infect Dis 2011; 24:50-5. [PMID: 21150594 PMCID: PMC3103765 DOI: 10.1097/qco.0b013e32834204bf] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE OF REVIEW China has experienced an increase in the incidence and prevalence of syphilis that is especially remarkable since this infection was virtually eradicated in the country 50 years ago. The purpose of this analysis is to provide an overview of recent literature on syphilis proximate determinants and potential public health responses. RECENT FINDINGS Per capita syphilis burden is greatest in coastal urban China. There are a number of biological, demographic, geographic, and behavioral/social proximate determinants of syphilis spread that distinguish the Chinese syphilis epidemic. These determinants portend the need for intensified syphilis control efforts, including: comprehensive testing and treatment; integration with HIV, sexually transmitted infection, and antenatal services; scale-up of novel rapid syphilis test technology, and multisectorial support. SUMMARY The Chinese central government recently announced a 10-year syphilis plan to provide clear expectations for evaluating the success of local syphilis control programs and integration with HIV testing programs. Further research is needed to understand the social and behavioral determinants driving the spread of syphilis.
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Affiliation(s)
- Joseph D Tucker
- Division of Infectious Disease, UNC Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA.
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72
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Williams M. Confidentiality of the medical records of HIV-positive patients in the United Kingdom - a medicolegal and ethical perspective. Risk Manag Healthc Policy 2011; 4:15-26. [PMID: 22312224 PMCID: PMC3270929 DOI: 10.2147/rmhp.s8997] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
This article examines the legal and ethical issues that surround the confidentiality of medical records, particularly in relation to patients who are HIV positive. It records some historical background of the HIV epidemic, and considers the relative risks of transmission of HIV from individual to individual. It explains the law as it pertains to confidentiality, and reports the professional guidance in these matters. It then considers how these relate to HIV-positive individuals in particular.
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Affiliation(s)
- Mike Williams
- Head of Service, Cambridge, University Dental Service, Cambridge, UK
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73
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Li D, Jia Y, Ruan Y, Liu Y, Li Q, Liang H, Zhou Z, Luo F, Zhang X, Jiang S, Shi W, Xing H, Shao Y. Correlates of incident infections for HIV, syphilis, and hepatitis B virus in a cohort of men who have sex with men in Beijing. AIDS Patient Care STDS 2010; 24:595-602. [PMID: 20731610 PMCID: PMC2957630 DOI: 10.1089/apc.2010.0083] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Recent data suggest that the prevalence of HIV/syphilis infections among men who have sex with men (MSM) in China increased rapidly. This cohort study was to assess the correlates of the incident infections for HIV, syphilis, and hepatitis B virus (HBV) among sexually active and HIV-negative MSM in China. A cohort of 507 HIV-seronegative MSM was recruited from November 2006 to February 2007. Sociodemographics, sexual and drug use behaviors, uptake of HIV-prevention services, and HIV, syphilis, and HBV seroconversions were assessed at 6- and 12- month follow-up. The incidence rates were 2.6 per 100 person-years for HIV, 16.9 per 100 person-years for syphilis, and 3.3 per 100 person-years for HBV. Multivariate Cox regression analyses showed that syphilis infection (hazard ratio [HR] = 3.6; 95% confidence interval [CI]: 1.1-11.6) and no perceived risk of HIV infection (HR = 6.0; 95% CI: 1.6-22.7) were independently associated with HIV seroconversion. Predictors for syphilis seroconversion included less education (HR = 1.87; 95% CI: 1.1-3.3), found male sex partners through bathhouses/public washrooms/parks (HR = 2.19; 95% CI: 1.2-4.0), drank alcohol 4 or more times monthly (HR = 1.95; 95% CI: 1.1-3.6), and had sexually transmitted diseases (HR = 2.65; 95% CI: 1.5-4.5). The only predictor for incident HBV seroconvension was having more male sex partners in the past 3 months (HR = 11.8; 95% CI: 1.5-90.4). Alarmingly high incidence rates of HIV, syphilis, and HBV were found among MSM concurrently with high prevalent risky behaviors and low uptakes of health care services. The findings of this study underscore the urgent needs for a comprehensive intervention strategy to curtail the rapid spread of HIV, syphilis, and HBV.
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Affiliation(s)
- Dongliang Li
- Chaoyang Center for Disease Control and Prevention, Beijing, P. R. China
| | - Yujiang Jia
- Institute for Global Health, Vanderbilt University School of Medicine, Nashville Tennesee
- Department of Pediatrics, Vanderbilt University School of Medicine, Nashville Tennesee
| | - Yuhua Ruan
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, P. R. China
| | - Yingjie Liu
- Chaoyang Center for Disease Control and Prevention, Beijing, P. R. China
| | - Qingchun Li
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, P. R. China
| | - Hongyuan Liang
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, P. R. China
| | - Zhenhai Zhou
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, P. R. China
| | - Fengji Luo
- Chaoyang Center for Disease Control and Prevention, Beijing, P. R. China
| | - Xiaoxi Zhang
- Chaoyang Center for Disease Control and Prevention, Beijing, P. R. China
| | - Shulin Jiang
- Chaoyang Center for Disease Control and Prevention, Beijing, P. R. China
| | - Wei Shi
- Chaoyang Center for Disease Control and Prevention, Beijing, P. R. China
| | - Hui Xing
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, P. R. China
| | - Yiming Shao
- State Key Laboratory for Infectious Disease Prevention and Control, and National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention (China CDC), Beijing, P. R. China
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