This is why a mask

The coronavirus has mutated into dozens of strains, but new (untested) reserarch indicates one strain above all may be defying odds:
[quote]Of the approximately 50,000 genomes of the new virus that researchers worldwide have uploaded to a shared database, about 70 percent carry the mutation, officially designated D614G but known more familiarly to scientists as “G.”

“G”...has taken over the world. Now scientists are racing to figure out what it means.

At least four laboratory experiments suggest that the mutation makes the virus more infectious, although none of that work has been peer-reviewed. Another unpublished study led by scientists at Los Alamos National Laboratory asserts that patients with the G variant actually have more virus in their bodies, making them more likely to spread it to others.

The mutation doesn’t appear to make people sicker, but a growing number of scientists worry that it has made the virus more contagious.
WaPo[/quote]