Data from a nationally representative household survey of South African youth aged 15–24 years found that sexually active men reporting anal intercourse were nearly twice as likely to be HIV infected as men reporting only vaginal sex (OR 1.7, 95% CI 1.0–3.0). The associated risk was more pronounced among men aged 15–19 years (OR 4.3, 95% CI 1.5–12.1). The association among women was not significant (OR 1.2, 95% CI 0.7–2.0).
aCenter for AIDS Prevention Studies, University of California, San Francisco, CA, USA
bDepartment of Epidemiology, University of North Carolina, Chapel Hill, NC, USA
cInfectious Disease Epidemiology Unit, Department for Infectious Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
dDepartment of Infectious Diseases, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
eReproductive Health and HIV Research Unit, University of the Witwatersrand, Johannesburg, South Africa.
Received 15 August, 2005
Accepted 1 September, 2005