Når en person vaccineres med ProQuad, danner immunsystemet (kroppens naturlige forsvar) antistoffer mod mæslinge -, fåresyge -, røde hunde - og skoldkoppevirus.
When a person is given the vaccine, the immune system (the body ’ s natural defences) will make antibodies against the measles, mumps, rubella, and varicella viruses.