Two masks, snug fit reduces COVID-19 spread, U.S. study shows

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Effectiveness of N95 Masks against SARS-CoV-2: Performance Efficiency, Concerns, and Future Directions

Face masks effectively limit the probability of SARS-CoV-2 transmission

Making masks fit better can reduce coronavirus exposure by 96 percent

Which type of face mask is most effective against COVID-19?

Largest study of its kind finds face masks reduce COVID-19 - UC Berkeley Public Health

LAC, DPH

Face masks effectively limit the probability of SARS-CoV-2 transmission

Face masks prevent the spread of COVID-19: MedlinePlus Medical Encyclopedia Image