HIV incidence among men who have sex with men using geosocial networking smartphone application in Beijing, China: an open cohort study

Background:Sexual transmission among men who have sex with men(MSM)is the dominant route of HIV transmission in China.Extensive use of geosocial networking(GSN)smartphone application(app)has dramatically changed the pattern of sexual behaviors and HIV risk among MSM;but data on HIV incidence and the changing risk behaviors of GSN app-using MSM are limited.We aims to assess the HIV incidence and its correlates among gay GSN app-using MSM in China.Methods:We constructed an open cohort which was initiated and maintained using a GSN app to assess the HIV incidence among app-using MSM,recruited from June 2017 to December 2018.MSM completed an online questionnaire on their sociodemographic characteristics,sexual behaviors,recreational drug use and sexually transmitted infections status.Then each man had an HIV test,and those tested negatives were enrolled into the cohort.Participants completed follow-ups with additional HIV tests though the app during the study period,and were censored at HIV seroconversion or study end date.HIV incidence was calculated by dividing the sum of observed HIV seroconversions by the observed person-time.Univariate(Chi-square test and Fisher's exact test)and multivariate(proportional hazards regression)analyses were used to examine correlates of HIV incidence.Results:A total of 6957 HIV negative MSM were enrolled in the open cohort,37 seroconversions occurred among 1937 men contributing 1065 observed person-years:HIV incidence was 3.47 per 100 person-years[95%confidence interval(Cl):2.37-4.57].More than five sexual partners[hazard ratio(HR)=2.65,95%Cl:1.04-6.67],and sex with HIV positive partners(HR=3.82,95%Cl:1.16-12.64)in the preceding six months were positively associated with HIV seroconversion.Consistent condom use for anal sex(HR=0.27,95%Cl:0.07-0.96),and reporting insertive anal sex only(HR=0.23,95%Cl:0.08-0.62)in the preceding six months were protective factors for HIV seroconversion.Conclusions:Tailored interventions targeting app-using MSM are urgently needed given their high risk of HIV.As a new tool for accessing MSM at higher HIV risk,GSN smartphone app could play an important role in HIV research among MSM.

HIV care-seeking behaviour after HIV selftesting among men who have sex with men in Beijing,China:a cross-sectional study

Background:Men who have sex with men(MSM)has become the group with the fastest growing HIV epidemic in China.Since many Chinese MSM are conducting HIV self-testing,we aimed to determine the rate of HIV care seeking after self-testing,examine characteristics of“seekers”compared to“non-seekers,”and explore factors associated with HIV care-seeking behaviour.Methods:A cross-sectional study design was used and an online survey was conducted in Beijing,China in 2016,among users of a popular Chinese gay networking smart phone application.Chi-square test was used to compare characteristics of those who sought HIV care(“seekers”)and those who did not(“non-seekers”).Univariate and multivariate logistic regression analyses were conducted to assess factors associated with HIV care seeking.Results:Among 21,785 screened,2383 participants(10.9%)were included in the study.A total of 380 participants(15.9%)reported seeking HIV care after HIV self-testing while 2003(84.1%)did not.Lack of knowledge of the“window period”(adjusted odds ratio[AOR]=0.68,95%confidence interval[95%CI]=0.47-0.97,P=0.04)was associated with reduced odds of seeking HIV care,while lower monthly income(AOR=1.29,95%CI=1.03-1.62,P=0.03)and obtaining HIV self-testing kits from health facilities(AOR=2.40,95%CI=1.81-3.17,P<0.001),and non-governmental organizations(AOR=2.44,95%CI=1.79-3.34,P<0.001)was associated with increased odds of seeking HIV care.Among those who sought HIV care,a large majority(92.4%)had non-reactive HIV self-testing results.Only 29 out of 265 with reactive,uncertain,or unknown results sought HIV care.Conclusions:We found a very low rate of HIV care seeking among our sample of urban Chinese MSM.The observation that most with reactive,uncertain,or unknown results did not seek HIV care is a cause for concern.These people should be paid more attention and helped to enter the care cascade.Our findings highlight that interventions aimed at improving linkage to care after HIV self-testing are urgently needed.However,further study is required to inform the design and implementation of future interventions aiming to encourage HIV care-seeking behaviour.