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.
WHAT IS HPV? ? Human papillomavirus (HPV) is a virus that is spread by skin-to-skin contact, including sexual intercourse, oral sex, anal sex, or any other contact involving the genital area (eg, hand to genital contact). Condoms do not provide complete protection from HPV infection because condoms do not cover all exposed genital skin. People do not become infected with HPV by touching an object, such as a toilet seat.
The risk of HPV exposure increases with the number of sexual partners you have and the number of partners your partner has. It has been estimated that 75 to 80 percent of sexually active adults will acquire HPV infection before the age of 50. A majority of women and men become infected with HPV for the first time between ages 15 and 25 years. Most people who are infected with HPV have no signs or symptoms and clear the infection within two years, often without treatment.
In 10 to 20 percent of people, however, the infection persists. In this situation, there is a greater chance of developing cervical pre-cancer and then cancer. However, it usually takes at least 20 years for HPV infection to cause cervical cancer. Thus, regular testing is important in detecting cervical abnormalities early, before cancer develops. (See "Patient information: Cervical cancer screening".)
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.
HPV VACCINE TIMING AND DOSE ? Gardasil® is given by injection and requires three doses; the first injection is followed by a second and third dose two and six months later, respectively.
Cervarix® is also given by injection and requires three doses, although the schedule is slightly different than with Gardasil; the first injection is followed by a second and third dose one and six months later, respectively.
It is not clear if the vaccine is effective if fewer than three doses are given.
Who should be vaccinated? ? In the United States, HPV vaccination is recommended for all girls and women who are between ages 9 and 26 years.
With both vaccines, you will have the greatest protection from HPV if you are vaccinated BEFORE becoming sexually active. The vaccine does not help to get rid of HPV infection after it has occurred. However, if you are less than 26 years old and you have been sexually active, had genital warts, a positive HPV test, or an abnormal Pap smear, you may still obtain some benefit from the HPV vaccine.
How long will you be protected for? ? Scientists do not know exactly how long the vaccine protects against HPV infection. Clinical trials show that it provides protection for at least five years.
Neither vaccines contain mercury
The vaccines efficacy have been extensively trailed and I can give you the links if you want to look at the studies
The vaccines manufactures have reported the following incidents of adverse effects
10%:
Central nervous system: Headache (12% to 28%), fever (8% to 13%)
Local: Injection site: Pain (61% to 84%), erythema (17% to 25%), swelling (14% to 25%)
1% to 10%:
Central nervous system: Dizziness (1% to 4%), malaise (1%), insomnia (1%)
Gastrointestinal: Nausea (2% to 7%), diarrhea (3% to 4%), vomiting (1% to 2%), toothache (2%)
Local: Injection site: Bruising (3%), pruritus (3%), hematoma (1%)
Neuromuscular & skeletal: Arthralgia (1%), myalgia (≤1%)
Respiratory: Pharyngolaryngeal pain (3%), cough (2%), nasal congestion (1%)