Gonorrhea as a risk factor for HIV acquisition

Area of Science:

• Epidemiology
• Public Health
• Infectious Diseases

Background:

• The link between gonorrhea and HIV acquisition is under investigation.
• Previous studies suggested gonorrhea facilitates HIV infection.
• The role of unprotected sexual activity requires precise quantification.

Purpose of the Study:

• To replicate a Zaïre study in Cameroon to assess gonorrhea's role in HIV acquisition.
• To determine if gonorrhea increases HIV risk in Cameroonian sex workers.
• To evaluate the impact of controlling for unprotected coitus on the gonorrhea-HIV association.

Main Methods:

• A nested case-control study involving 273 initially HIV-1-negative Cameroonian sex workers.
• Prospective follow-up with monthly STD check-ups and 3-monthly HIV-1 serology.
• Comparison of gonorrhea incidence and sexual exposure between HIV seroconverters and seronegative controls.

Main Results:

• The association between gonorrhea and HIV acquisition was weaker in Cameroon (OR 2.2) than in Zaïre (OR 6.3).
• Controlling for irregular condom use reduced the odds ratio (OR) in Cameroon to 1.7.
• Using a precise measure of unprotected coitus further reduced the OR to 1.4, suggesting gonorrhea is a marker for unprotected sex.

Conclusions:

• Gonorrhea did not directly facilitate HIV acquisition in the Cameroonian cohort.
• Gonorrhea served as an indicator of unprotected sexual activity, the actual facilitator of HIV acquisition.
• The study highlights the importance of precise measurement of condom use in epidemiological research to avoid overestimation of associations.