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quadrivalent vaccine (KWAH-drih-VAY-lent vak-SEEN)
|A vaccine that works by stimulating an immune response against four different antigens, such as four different viruses or other microorganisms. For example, Gardasil is a quadrivalent vaccine that helps protect the body against infection with human papillomaviruses (HPV) types 6, 11, 16, and 18. HPV types 6 and 11 cause most cases of genital warts. HPV types 16 and 18 cause most cases of cervical cancer and cause other types of cancer.|