See also : [[Human Papillomavirus]]
== Causes ==
[[Human Papillomavirus]] (HPV) infection appears to be a necessary factor in the development of almost all cases (90+%) of cervical cancer. HPV vaccines effective against the two strains of this large family of viruses that currently cause approximately 70% of cases of cervical cancer have been licensed in the U.S, Canada, Australia, and the EU. Since the vaccines only cover some of the cancer-causing ("high-risk") types of HPV, women should seek regular Pap smear screening, even after vaccination.