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

The Conversation
by Kar-Hai Chu, Associate Professor of Public Health, University of Pittsburgh
April 10, 2026
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4 min read

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The Bottom Line

Declining vaccination rates in Allegheny County mean one-third of kindergarten classrooms lack measles herd immunity.

How This Affects You

Families in Allegheny County face increased measles risk, as 2,255 U.S. cases in 2025 nearly doubled the 2019 peak.

AI Summary

Declining vaccination rates in Allegheny County, Pennsylvania, mean that one in three kindergarten classrooms lacked the necessary herd immunity for measles during the 2023-24 school year. This data, obtained via The Washington Post in January 2026, indicates a coverage level below the 95% required to stop measles spread. The disparity is largely due to higher rates of vaccination exemptions in private and parochial/religious schools compared to public schools. In June 2025, HHS Secretary Robert F. Kennedy Jr. dismissed all 17 members of the CDC's Advisory Committee on Immunization Practices, appointing new members with questionable qualifications. This disruption to evidence-based recommendations has real-world consequences, with 2,255 confirmed measles cases in the U.S. in 2025, nearly double the 2019 peak.

What's Being Done

HHS Secretary Robert F. Kennedy Jr. dismissed and replaced the CDC's Advisory Committee on Immunization Practices members in June 2025.

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