"The best protection everybody has is masks. … While delta numbers are going up—and if I’m in a crowded outdoor location with lots of people yelling—I would be wearing a mask."

Kimberly Prather, a professor at the University of California at San Diego who has studied airborne virus transmission, commenting to The Washington Post for its recent report, “Mask Mandates Make a Return—Along With Controversy.” Prather told the newspaper she “absolutely” supports the resumption of indoor mask mandates.