Per-partner unprotected insertive AI (UIAI) and combined URAI–UIAI risk were 21.7% (95% CI 0.2–43.3) and 39.9% (95% CI 22.5–57.4), respectively, with no available per-act estimates.
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E-mail: [email protected] Centre for the Mathematical Modelling of Infectious Disease, Infectious Disease Epidemiology Unit, Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK, Centre for the Mathematical Modelling of Infectious Disease, Infectious Disease Epidemiology Unit, Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK, Background The human immunodeficiency virus (HIV) infectiousness of anal intercourse (AI) has not been systematically reviewed, despite its role driving HIV epidemics among men who have sex with men (MSM) and its potential contribution to heterosexual spread.
We assessed the per-act and per-partner HIV transmission risk from AI exposure for heterosexuals and MSM and its implications for HIV prevention.
The rate of SCCA is 2-3 times higher in HIV-infected MSM than in HIV-uninfected MSM.
Rates of anal HPV infection and abnormal cytology increase with decreasing CD4 counts.
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HIV infection is associated with increased rates of anal HPV infection, anal dysplasia, oncogenic HPV types, and SCCA.