The United States is witnessing a significant decline in vaccination rates for measles, mumps, and rubella (MMR) as reported across more than 2,000 counties, according to a study published in JAMA . Data covering the years 2019 through 2024 show that the county-level mean vaccination rate fell from 93.92% in the pre-pandemic years to 91.26% after the pandemic with 78% of counties reporting declining rates. Only 4 states reported increased rates of MMR vaccination during …
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