Human papillomavirus types 6 and 11 seropositivity: Risk factors and association with ano-genital warts among homosexual men

Ano-genital warts, caused by human papillomavirus, are very common. In a community cohort of Australian homosexual men, HPV6 and 11 seroprevalence and seroincidence were high and were associated with past and incident anal warts and other markers of sexual activity.