Authored by: Amy Lauren Fairchild, Cheryl Healton, and Sandro Galea.
Although we don’t yet know what proportion of new infections are the result of transmission from people who are asymptomatic or pre-symptomatic, we know enough to require everyone, unless they have a medical condition like severe asthma that would make mask a health hazard, to wear a mask anytime they are in indoor public spaces or crowded outdoor spaces.
People infected with SARS-CoV-2, the virus that causes Covid-19, most actively shed the virus at the time symptoms begin. Individuals without symptoms who test positive for Covid-19 show viral loads as high as those with symptoms. Individuals who are infected with the virus can feel fine but still transmit virus for days before they develop any symptoms.
A national mask order can be nuanced. Evidence continues to suggest that indoor aerosol or droplet transmission is key to the spread of the epidemic. A mask probably doesn’t need to be worn while jogging or strolling through a park or lightly populated outdoor area if you won’t be close to other people. But they should be worn in urban areas with heavy pedestrian traffic, during protests, or at political rallies.
Read the full piece on STAT News.
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