Heterosexual transmission is the predominant mode of transmission of H
IV-1 in most of the world, Factors correlated with viral shedding from
the female reproductive tract land thus infectivity of women) are dis
cussed in this review. Hormonal contraceptive use, cervical ectopy, pr
egnancy, abnormal cervical and vaginal discharge, and CD4 lymphocyte d
epletion have been associated with increased HIV-1 shedding in women;
however, findings vary between studies. Prevalence and correlates of c
ervicovaginal HIV-1 shedding in larger published studies are discussed
and potential mechanisms for observed associations are reviewed.