cause of cervical cancer
HPV is mainly transmitted through sexual contact and most people are infected with HPV shortly after the onset of sexual activity. Cervical cancer is caused by sexually acquired infection with certain types of HPV. Two HPV types (16 and 18) cause 70% of cervical cancers and precancerous cervical lesions. There is also evidence linking HPV with cancers of the anus, vulva, vagina and penis.