Association between macroscopic-factors and identified HIV/AIDS cases among injecting drug users: an analysis using geographically weighted regression model.

Drug use (DU), particularly injecting drug use (IDU) has been the main route of transmission and spread of Human Immunodeficiency Virus (HIV)/Acquired Immune Deficiency Syndrome (AIDS) among injecting drug users (IDUs). Previous studies have proven that needles or cottons sharing during drug injection were major risk factors for HIV/AIDS transmission at the personal level. Being a social behavioral issue, HIV/AIDS related risk factors should be far beyond the personal level.

[HCV prevalence among the populations under the HIV sentinel surveillance data from 2009 to 2012 in China].

Objective: To analyze the hepatitis C virus (HCV) prevalence among 8 populations in 2009-2012 in China, using the HIV sentinels surveillance data.

Methods: Cross-sectional studies had been repeatedly conducted on HIV Sentinel Surveillance with uniformed questionnaire and collection of venous blood specimen among 8 populations including drug users (DUs), men who have sex with men(MSM), female sex workers(FSW), male STD clinic attendees, male long distance truck drivers, male mobile populations, pregnant women and young students from April to June 2009 to 2012 on the yearly base. Blood testing for HIV, syphilis and HCV infections have been routinely performed on all participants of 8 populations recruited during the surveillance period.

[Situation on HIV/AIDS epidemics among migrant population in China, 2008 - 2011].

Objective: To analyze the HIV/AIDS epidemics situation among migrant population.

Methods: Data on HIV/AIDS cases among mobile population through case reporting system was collected from 2008 to 2011.

Results: The number of reported cases on HIV/AIDS among mobile population had been rising, with proportions of the total reported cases increased from 10.

HIV prevalence and influencing factors analysis of sentinel surveillance among men who have sex with men in China, 2003 - 2011.

Background: Men who have sex with men (MSM) have been impacted by HIV and now as an important driver of the HIV/AIDS epidemic in China. This study collected HIV sentinel surveillance system data on the MSM population to describe the characteristics and trends of the HIV epidemic among MSM in China from 2003 to 2011.

Methods: Data on HIV prevalence and risk behaviors from 2003 to 2011 were obtained from the national HIV sentinel surveillance database.

[Epidemic characteristics of HIV/AIDS among men who have sex with men from 2006 to 2010 in China].

Objective: To analyze the epidemic characteristics of HIV/AIDS among men who have sex with men (MSM) from 2006 to 2010 in China, and to provide evidence for the development of prevention and control measures.

Methods: Through the network reporting information system. The distribution of MSM transmission was analyzed.

[Impact of delayed diagnoses bias on the estimation of AIDS incubation].

Objective: Using the HIV positive paid blood donors (PBDs) as example, to investigate the impact of the delayed diagnosed HIV/AIDS patients on the calculated median incubation of AIDS.

Methods: Information was retrospectively collected on HIV/AIDS patients who were infected through paid blood donation. Data was from the national HIV/AIDS case reporting system.

[Study on the HIV infection status, characteristics of AIDS-related behaviors and risk factors among men attending the sexually transmitted disease clinics].

Objective: To understand the status on AIDS awareness, AIDS-related behaviors, risk factors on HIV infection status among 15 - 90 years or older men at the sexually transmitted disease clinics.

Methods: Data from the 2009 and 2010 national sentinel surveillance system, regarding men attending sexually transmitted disease clinics was collected from Guangdong, Guangxi, Henan, Sichuan, Yunnan and Jiangxi provinces, where the AIDS epidemic among 15 - 90 years or older population was serious. Data was uploaded to National Center for AIDS/STD Control and Prevention (NCAIDS) through the comprehensive AIDS control and prevention information system.

Estimation and projection of the HIV epidemic trend among the migrant population in China.

Objective: The migrant population is a vulnerable group for HIV infection in China. Understanding potential epidemic trends among migrants is critical for developing HIV preventative measures in this population.

Methods: The Estimation and Projection Package (EPP) model was used to process prefecture and county-level surveillance data to generate HIV prevalence and epidemic trends for migrant populations in China.

Spatial distribution of HIV/AIDS in Yunnan province, People's Republic of China.

Risk maps for the geographical distribution of human immunodeficiency virus (HIV) and the acquired immune deficiency syndrome (AIDS) are needed for the direction of HIV prevention interventions. Our study, based on county-level data on the numbers of HIV/AIDS patients in the Yunnan province, People's Republic of China, applied trend surface analysis and spatial autocorrelation analysis to demonstrate the geographical distribution of HIV-positive patients in the province. The case load of HIV was found to be most severe in the central-west region of the province.

[HIV prevalence among populations at risk, using sentinel surveillance data from 1995 to 2009 in China].

Objective: To effectively monitor the time trend of HIV prevalence and epidemic among injecting drug users (IDUs), female sex workers (FSWs), sexually transmitted disease (STD) clinic attendants, men who have sex with men (MSM) and pregnant women etc., to provide information for evaluation on strategies regarding comprehensive HIV prevention and effectiveness of intervention, in China.

Methods: Cross-sectional studies had been repeatedly conducted on sentinel surveillance program with uniformed questionnaire and collection of venous blood specimen among IDUs, FSWs, STD clinic attendants, MSM and pregnant women, from 1995 to 2009.

[Situations and trends of HIV and syphilis infections among drug users in China, 1995 - 2009].

Objective: To understand the characteristics and trends of HIV and syphilis infections among drug users.

Methods: Information was collected regarding HIV and syphilis epidemics, as well as on high risk behaviors from the HIV/AIDS surveillance system. Source of information was from HIV/AIDS case-reporting, sentinel surveillance and trend estimation, related to the changes of distribution among HIV positive drug users prevalence rates on HIV and syphilis together with their high risk behaviors.

[HIV/AIDS epidemic situation and data analysis among young students from 2006-2009 in China].

Objective: To analyze the HIV/AIDS epidemic situation and related behavioral components among young students in the last years and to provide information for integrated control and prevention programs.

Methods: Data on young students (15 - 24 years) through case reporting system was collected from 2006 to 2009 and continuous sentinel surveillance data regarding 6 national sentinel sites carried out from 2006 to 2009 was also collected. The sentinel sites would include universities, junior college and secondary vocational colleges registered students, using cluster sampling phases method.

[Data analysis of national HIV comprehensive surveillance sites among female sex workers from 2004 to 2008].

Objective: To monitor the time trend of behaviors change related to HIV/AIDS epidemic and HIV prevalence, and to provide information and basis for comprehensive HIV prevention responses and evaluation of intervention effectiveness among female sex workers in China.

Methods: During the year of 2004 to 2008, a series of cross-sectional surveys were conducted among female sex workers in community recruited in both entertainment places and in street, during the defined timeframe, a face-to-face interview was conducted with uniformed questionnaire; while, the venous blood specimen was collected. The sample size was 400 per site per survey.

[Retrospective research on proportion of HIV related death causes in nine counties in China].

Objective: To investigate the proportion of HIV related death cause, and its years of potential life lost (YPLL) and work years of potential life lose (WYPLL) in project counties.

Method: According to the protocol of the third national death causes surveillance and HIV related death causes surveillance, retrospective study was implemented including baseline investigation of deaths' name list, demography information, door-to-door interview and death causes deduction in Gejiu, Ruili and Longchuan county in Yunnan province, Yangdong county in Guangdong province, Luzhai county in Guangxi zhuang Autonomous Region, Weishi and Zhecheng county in Henan province, Xishui county in Hubei province and Gu'an county in Hebei province.

Results: The study was conducted among nine counties located in seven provinces.