Sexually transmitted infections (
STIs) remain a public health concern because of their interaction(s) with HIV. In the HPTN 052 study,
STIs were evaluated in both HIV-positive index cases and their HIV-negative partners at enrollment and at yearly follow-up visits. Our definition for
STI was based on any
infection with Chlamydia trachomatis, Neisseria gonorrhoeae,
syphilis, or Trichomonas vaginalis. We used log-binomial regression models to identify factors associated with prevalent
STIs. Generalized estimating equation models with the Poisson distribution were used to compare
STI incidence between HIV-positive index cases and HIV-negative partners. 8.1% of the participants had
STIs at enrollment. The prevalence of
STIs (8.9 vs. 7.2) was higher in HIV-positive index cases than HIV-negative partners. Being female (prevalence ratio (PR) = 1.61; 95% CI: 1.20-2.16) or unmarried (PR = 1.92; 95% CI: 1.17-3.14) was associated with prevalent
STIs. Compared to HIV-negative male partners, HIV-positive female index cases had a higher risk of
STI acquisition (incidence rate ratio (
IRR) = 2.25; 95% CI: 1.70-2.97). While we are implementing HIV prevention interventions for HIV-negative people, we should also intensify targeted
STI prevention interventions, especially among HIV-positive women.