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Kar-Hai Chu

Kar-Hai Chu

The Conversation

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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

As childhood vaccination rates in Allegheny County decline, The Conversation asked experts why parents are opting out and how to protect vaccination...

10.04.2026 7

The Conversation

Kar-hai chu

What declining vaccination rates mean for your family – and what you can do

As childhood vaccination rates in Allegheny County decline, The Conversation asked experts why parents are opting out and how to protect vaccination...

10.04.2026 7

The Conversation

Kar-hai chu