HPV infection (genital warts) is caused by the human papillomavirus. The causative agent is the human papillomavirus (HPV), a small virus that contains a double-stranded DNA. Types of HPV risk: 16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, 59, 68. 5 types of HPV remain low-risk cancer viruses - 6, 11, 42, 43, 44.