Investigation of a HIV cluster outbreak linked to commercial heterosexual activities
Objective To elucidate the transmission dynamics of a HIV cluster outbreak associated with commercial heterosexual activities in County P,Zhejiang Province,China.Methods Epidemiological investigation methods were employed to collect sociodemographic characteristics,mobility information,previous HIV testing history,high-risk sexual behavior history,and details of sexual partners of individuals involved in the cluster.The analysis was conducted in conjunction with monitoring of the HIV molecular transmission network.Results In October 2023,molecular surveillance identified a transmission cluster comprising six cases,including four males and two females.Case 2 exhibited a degree value of 4,indicating a high transmission risk.In addition to the four male cases in the cluster,the male sexual partners of Case 2 were traced back to an additional 11 individuals,among whom three tested positive for HIV(two of whom were previously known positives).Among the 15 male partners,there was one non-commercial,non-marital heterosexual partner and 14 commercial heterosexual partners.Seven tested positive for HIV(six previously known positives and one newly diagnosed),while the others tested negative.The cluster outbreak involved nine cases,with seven being male;eight were aged 50 years or older,and all were either farmers or migrant workers.Among the nine HIV-infected individuals,one was linked to noncommercial and nonmarital heterosexual transmission,one to marital transmission,and seven to commercial heterosexual transmission.Conclusions This localized HIV cluster outbreak was primarily driven by commercial heterosexual activities centered on Case 2 that subsequently led to transmission within marital and stable partnerships.The integration of partner tracing through traditional epidemiological investigation,enhanced by HIV molecular transmission network technology and supported by law enforcement,significantly improved the capacity for HIV source tracing.
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维普
