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Revealing Gaps in HEPA Protection

JAMA Network | October 10, 2025

This clinical trial of HEPA air purifiers in 200 elementary school classrooms, conducted by Peggy Lai, MD, PhD, of Massachusetts General Hospital, showed that nearly all air samples contained respiratory viruses. Additionally, high viral exposure occurred in about one in five samples.

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Cleveland, OH | Sep 27, 2026
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