![]() ![]() So what makes a high-performing mask? Marr says a mask's filtration efficiency is a function of both what material it's made of and how well it seals to your face. All of that means it's imperative that you make sure your mask is protective, and not simply a bedazzled decoration for your face. It's now one of the most contagious respiratory viruses we know of.Īnd it also replicates quickly in the noses and throats of infected people, so they could be walking around with 1,000 times more virus in their body than with the original strain. The delta variant transmits more than twice as easily as the original strain of the coronavirus. "Masks still work, but with delta, we need better-performing masks," says Linsey Marr, a researcher at Virginia Tech who studies airborne virus transmission. With delta surging and health officials urging indoor mask use in many places, you've likely pulled out your old cloth masks. It's been updated throughout to reflect new developments and the latest science. ![]()
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