title: Why are all men who have had sex with men even once since 1977 indefinitely deferred from donating blood?
authors.forename: Eleftherios C
authors.initials: EC
authors.lastname: Vamvakas
mesh_terms: D001782:Blood Donors; D015658:HIV Infections / Q000635:transmission*; D019288:Herpesvirus 8, Human / Q000302:isolation & purification; D018451:Homosexuality, Male; D006801:Humans; D008297:Male; D017713:Platelet Transfusion / Q000009:adverse effects*; D012725:Sexual Behavior; D013997:Time Factors