Masks can’t reduce Covid infection rates or transmission of any virus: Petty
Viruses travel in aerosols that stay suspended in air up to 50 days (Updated 7/31/22)
Industrial hygienist Stephen Petty gave excellent testimony in the New Hampshire Senate on how masks don’t block aerosols and can’t reduce viral infection rates.
(His PDF handout is here.)
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Unfortunately, many doctors who haven’t had time to read the studies rely on government officials or health administrators issuing scientifically unsupportable masking mandates.