Childhood vaccination rates against measles fell in the years after the COVID-19 pandemic in nearly 80% of the more than 2,000 U.S. counties with available data.

Across 2,066 counties in 33 states with both pre- and post-pandemic vaccination data, the county-level mean MMR vaccination rate decreased from 93.92% to 91.26%, according to Lauren Gardner, PhD, of Johns Hopkins University in Baltimore, and colleagues.