(PITTSBURGH) As the risk of measles remains an ongoing concern, herd immunity in Allegheny County, Pennsylvania, is already slipping. According to data obtained via The Washington Post in January 2026, 1 in 3 Allegheny County kindergartners were in a classroom too far below adequate vaccination coverage to stop a measles outbreak during the 2023-24 school year.
A professor from the University of Pittsburgh’s School of Public Health, Kar-Hai Chu, and a research program supervisor, Maggie Slavin, answered our questions about declining measles, mumps and rubella vaccination rates and what it means for the future of public health.
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