the vaccine may protect against two of the strains that may lead to cervical cell changes.
Being vague is really unhelpful and misleading
HPV VACCINE OVERVIEW ? Human papillomavirus (HPV) is a virus that causes cervical cancer and genital warts. Persistent infection with certain types of HPV can lead to cancer of the cervix, which affects more than 10,000 American women every year. HPV can also cause cancers of the vulva, vagina, and anus, although these cancers are much less common than cervical cancer.
Two vaccines (Gardasil® and Cervarix®) are available to prevent infection with several types of HPV known to cause cervical cancer. It is hoped that these vaccines will significantly reduce the number of women who develop cervical cancer and pre-cancer.
Over 100 different types of HPV have been identified; 40 of these are known to infect the cervix and 15 are known to cause cervical cancer. Researchers have labeled the HPV types as being high or low risk for causing cervical cancer.
HPV types 6 and 11 can cause about 90 percent of genital warts. These types are low-risk because they do not cause cervical cancer. (See "Patient information: Genital warts in women".)
Types 16 and 18 are the high-risk types that cause most (about 70 percent) cases of cervical cancer. HPV types 45 and 31 are also high-risk types, causing about 5 to 10 percent of cervical cancers.
There are two HPV vaccines available. Talk to your healthcare provider to determine which vaccine is best for you.
One HPV vaccine (Gardasil®) helps to prevent infection with four HPV types (6, 11, 16, and 18)
The other vaccine (Cervarix®) prevents infection with HPV types 16 and 18, and it may offer some protection against HPV types 45 and 31.
The two strains that both vaccines protect against cause 70% of cancer and the vaccine give some protection against other strains as discussed
The vaccines have 95-100% efficacy in doing so
Every time you post your vague opinions, I will clarify what the evidence actually proves