The Gardasil vaccine produced by Merck & Co. (Merck) is a quadrivalent vaccine because it protects against four HPV types: 6, 11, 16 and 18. Gardasil is given through a series of three injections into muscle tissue over a period of six months.

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Another vaccine, Cervarix by GlaxoSmithKline (GSK), is bivalent because it targets two HPV types: 16 and 18. This vaccine is also administered in three doses over a period of six months. Findings have shown that Cervarix also protects against persistent infection with HPV 16 and 18.

Neither of these vaccines have proved to provide complete protection again persistent infection with other HPV types some of which cause cervical cancer. About 30 percent of cervical cancers and 10 percent genital warts will not be prevented by these vaccines.
 

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