President Joe Biden has asked Americans to wear masks for the first 100 days of his administration. With new variants of COVID-19 posing a risk of more infections and U.S. vaccinations still ramping up, finding the right fit for your face mask is critical. We spoke with Dr. Clare Rock, an epidemiologist, and Melanie Curless, assistant director of Infection Control at Johns Hopkins Hospital, for tips about how to get the best protection.
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