New data show decline in MMR vaccination rate in the U.S.
A new county-level dataset from researchers at Johns Hopkins University shows a nationwide decline in measles, mumps, and rubella (MMR) vaccination rates among U.S. children since the start of the COVID-19 pandemic. Of the 2,066 counties studied, 1,614 counties (78%) reported a drop in vaccinations, and the average county-level vaccination rate fell from 93.92% pre-pandemic to 91.26% post-pandemic – a decrease of 2.67% on average, moving further away from the 95% herd immunity threshold needed to predict or limit measles outbreaks. Only four of the 33 states studied—California, Connecticut, Maine, and New York—reported an increase in average county-level vaccination rates. The data is published today in JAMA. The data is published after more than a thousand measles cases were reported in the United States this year. With the exception of the year…


