The cervical cancer vaccine, also known as the human papillomavirus HPV vaccine, is a vaccine to prevent the development of cervical cancer. Studies have found that 99.7% of cervical cancers are related to infection with HPV. there are more than 100 known subtypes of HPV and fourteen are high risk, with the two highest risk strains being HPV type 16 and HPV type 18, which can cause about 70% of cervical cancer cases. HPV is transmitted primarily through sexual contact and can also be contracted through direct contact, infecting 80% of women at some point in their lives. If infected with high-risk HPV, there is a risk of progression to cervical cancer. The most effective way to prevent cervical cancer is to get the HPV vaccine, preferably before a woman has her first substantial sexual contact. 2-valent vaccine targets HPV types 16 and 18, 4-valent vaccine targets HPV types 6, 11, 16 and 18, and 9-valent vaccine targets HPV types 6, 11, 16, 18, 31, 33, 45, 52 and 58.