[HIV infection and related factors of traceability efficiency among sex partners of HIV positive men who have sex with men].

To investigate the situation related to HIV infection and influencing factors of traceability efficiency among sex partners of HIV positive men who have sex with men (MSM). A cross-sectional survey was conducted to investigate the traceability among sex partners of HIV-positive MSM in Ningbo from 2018 to 2020. Limiting-antigen avidity enzyme immunoassay determined recent HIV infection. The classified data was evaluated by chi-square test, and factors of traceability efficiency were analyzed by multivariate logistic regression. A total of 374 newly confirmed HIV-positive MSM were recruited to participate in the HIV test in Ningbo from 2018 to 2020.HIV positive rate of sex partner was 15.7% (75/479,95%12.4%-18.9%). HIV positive rates of sex partner of recent HIV infection MSM was 31.8% (21/66,95%:20.3%-43.4%). The proportion of newly confirmed HIV-positive sex partners of recent HIV infection MSM (76.2%) was higher than that of long-term HIV infection MSM (48.1%). The difference was statistically significant (=0.028). Results from the multivariate logistic regression analysis showed that HIV traceability efficiency was higher in the following subpopulations as; HIV positive MSM who were 36-45 years old (compared with 18-25 years old, =3.973,95%:1.364-11.569), HIV active detection (compared with HIV passive detection, =1.896, 95%:1.083-3.319), recent HIV infection MSM (compared with long-term HIV infection MSM, =3.733, 95%:1.844-7.556). HIV positive rate among partners of HIV positive MSM was very high. The traceability efficiency, which was recent HIV infection MSM and HIV active detection, was high. It is suggested to strengthen the traceability and focus on the newly confirmed HIV-positive MSM in VCT clinics.