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A comment on Researchers propose that humidity from masks may lessen severity of Covid-19. Parent comment
https://www.thelancet.com/journals/lancet/article/PIIS0140-6...
( Resurgence of COVID-19 in Manaus, Brazil, despite high seroprevalence )
https://www.thelancet.com/journals/lancet/article/PIIS0140-6...
( Resurgence of COVID-19 in Manaus, Brazil, despite high seroprevalence )