MMR vaccine remains best protection against measles, but study suggests level of protection decreases slightly over time

Most measles cases in England are among unvaccinated individuals. But, between 2011 and 2019, the proportion of measles cases in adults who received two doses of the MMR vaccine in England increased from 1.9% (20/1,064) to 7.2% (57/790). However, the cause of this increase remains unclear.

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