A vial of the measles, mumps and rubella vaccine is on display at the Lubbock Health Department, on Feb. 26, 2025, in Lubbock, Texas. Mary Conlon/AP

Most counties in the United States have seen a decline in childhood measles, mumps and rubella vaccination rates over the last five years, according to a new report published Monday.

Researchers from Johns Hopkins University looked at data from 2,066 counties across 33 states between 2019 and 2024. They found that 78% of the counties, or 1,614, reported a decrease in vaccination rates over that period.

What's more, the average vaccination rate fell from 93.92% pre-pandemic to 91.26% post-pandemic, according to the report. This represents a decline of about 3%.

Researchers also found that just four states -- California, Connecticut, Mai

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