Up to 10% of cases in the current wave of the disease are in people already vaccinated, as questions are raised about adult immunity
A vial of the measles, mumps, and rubella virus vaccine is pictured at the International Community Health Services clinic in Seattle, Washington, the US. Picture: REUTERS/LINDSEY WASSON
The figure illustrates what can happen when a large number of individuals, even those who have been vaccinated, are exposed to the measles. CDC recommends that people who are living in or travelling to outbreak areas should check their vaccination status and consider getting a new dose. Anyone vaccinated between 1963 and 1989 would likely have received only one dose, with many people immunised in the earlier years receiving an inactivated version of the virus. Americans born before 1957 are considered immune as they would have been exposed to the virus directly in an outbreak.
For travellers to outbreak areas abroad, the CDC recommends adults consider getting another dose of MMR unless they have proof of receiving two prior doses, take a blood test showing immunity, or were born before 1957.
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