Scientific backing for CDC mask reversal most likely ‘doesn’t exist’: Dr. Kulldorff
New federal guidance on face coverings draws reaction from Harvard Medical School professor Martin Kulldorff on ‘Fox & Friends First.’
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Scientific backing for CDC mask reversal most likely ‘doesn’t exist’: Dr. Kulldorff
New federal guidance on face coverings draws reaction from Harvard Medical School professor Martin Kulldorff on ‘Fox & Friends First.’