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NCI Dictionary of Cancer Terms


quadrivalent vaccine  listen  (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 four different types of human papillomaviruses (HPV).