| per-contact risk of human immunodeficiency virus transmission between male sexual partners. | the risk of human immunodeficiency virus (hiv) transmission from various types of homosexual contact, including oral sex, is of biologic, epidemiologic, and public health importance. the per-contact risk of acquiring hiv infection from specific acts was estimated in a prospective cohort study of 2,189 high-risk homosexual and bisexual men, conducted in san francisco, california; denver, colorado; and chicago, illinois, in 1992-1994. during 2,633 person-years of follow-up, 60 seroconversions were ... | 1999 | 10430236 |