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What declining vaccination rates mean for families in Allegheny County – where 1 in 3 kindergarten classrooms lack herd immunity for measles

  • Written by Kar-Hai Chu, Associate Professor of Public Health, University of Pittsburgh
imageUnvaccinated individuals face 140 times higher risk of contracting measles.Sarah L. Voisin/The Washington Post via Getty Images

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...

Read more: What declining vaccination rates mean for families in Allegheny County – where 1 in 3 kindergarten...

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