The best-case scenario for one of the most common COVID-19 interventions may be that it has no measurable effect on infection, recent studies suggest.
A systematic review of studies of mask mandates for children, published Saturday in the British Medical Journal’s Archives of Disease in Childhood, found “no association” with infection or transmission in 16 of the 22 observational studies and “critical” or “serious” risk of bias in the six countervailing studies. It got the attention of Elon Musk, owner of X, formerly Twitter.
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