Analysis of newly diagnosed HIV infection and influencing factors among men who have sex with men in gay bathhouses in Tianjin
10.3760/cma.j.cn112338-20230506-00281
- VernacularTitle:天津市男性浴池男男性行为人群HIV新发感染及影响因素分析
- Author:
Ziming WU
1
;
Yan GUO
;
Hui GONG
;
Zhongquan LIU
;
Peng XU
;
Jie YANG
;
Jie XU
;
Maohe YU
Author Information
1. 天津市疾病预防控制中心性病艾滋病预防控制所，天津 300011
- Keywords:
AIDS;
Men who have sex with men;
Influencing factors
- From:
Chinese Journal of Epidemiology
2023;44(11):1781-1786
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To analyze the newly diagnosed HIV infections and influencing factors among MSM (men who have sex with men) in gay bathhouses in Tianjin and to provide evidence for taking preventive interventions to reduce HIV infections in this population.Methods:Male individuals who sought sexual partners in gay bathhouses and engaged in insertive oral or anal sex with men within the past year were targeted. An open cohort was formed from March 2011 to December 2021 for HIV testing and baseline investigation, followed by follow-ups and screenings. The survey included demographic data and information related to AIDS behaviors. The differences between single-testing and multiple-testing groups were compared, and the positivity rate and incidence rate of new infections in the multiple-testing group were calculated. The Cox proportional hazards regression model was used to analyze the factors influencing the incidence rate of new HIV infections. EpiData 3.02 was used for database construction and SAS 9.4 for statistical analysis.Results:During the research period, 12 195 tests were conducted, involving 7 151 subjects. Among them, primarily those aged ≥30 years (70.18%) and non-local residents (61.32%), with ages ranging from 16 to 82, and M ( Q1, Q3) of age was 36 (28,48), 547 tested positive. Compared to the single-testing group, the multiple-testing group had higher proportions of local residents, married/cohabiting individuals, recent anal intercourse, peer education acceptance, and those diagnosed with an STD in the last year, but a lower proportion of consistent condom usage in recent same-sex encounters. The positivity rate during this period was 7.65% (95% CI: 7.00%-8.00%), declining from 12.58% in 2011 to 3.31% in 2021. A total of 1 740 subjects were included in the open cohort with a cumulative follow-up time of 4 688.61 person-years, with 144 new HIV infections identified. The incidence rate of new infections was 3.07/100 person-years (95% CI: 2.57/100 person-years- 3.57/100 person-years). Multifactorial Cox regression analysis revealed that non-local subjects (a HR=1.32,95% CI:1.19-1.45) and those engaged in group sex with the same gender in the last six months (a HR=1.18,95% CI:1.02-1.36) had higher risks of new HIV infections. Conclusions:MSM in gay bathhouses in Tianjin commonly engage in unsafe sexual behaviors like group sex, emphasizing the need for increased awareness, intervention efforts, and collaboration with MSM community organizations for peer education and proactive HIV testing in gay bathhouses. Moreover, exploring new methods to reduce new HIV infections among MSM is necessary.
