More than 20 west Aucklanders vaccinated for mumps still contracted the viral illness.
Auckland Regional Public Health Service (ARPHS) confirmed there was a mumps outbreak in the region – 148 cases as of July 7, with 82 of those cases from west Auckland.
Of the 82, 24 were fully vaccinated with the measles, mumps and rubella (MMR) vaccine.
ARPHS clinical director Dr Julia Peters said MMR was 88 per cent effective at preventing mumps.
“So a small number of people may still get the disease, even if they have been vaccinated,” Peters said.
“Furthermore, some people who have received MMR may…