TOPICS: Human Papillomavirus, DNA virus, HPV, circular genome, double-stranded, naked virus, serotypes, HPV1, HPV2, HPV6, HPV11, warts, HPV16, HPV18, cervical cancer, verruca on hands, verruca on feet, condyloma accuminatum, laryngeal papillomas, HIV, AIDS, immunocompromised, anal cancer, CD4 less than 500, E7 protein, E6 protein, koilocytes, Gardasil vaccine