Experts advise on effectiveness of wearing a face mask
"The primary transmission [of coronavirus] is now known to be droplet-based, and we now know that that transmission largely occurs in the first seven days after infection, when people are largely asymptomatic. So that means that if you’re highly infectious, you probably won’t know it. So we should all assume that we are potentially lethal to people around us. The way we are potentially lethal to people around us is when we speak: that’s when these micro droplets get ejected up to six feet."
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