"If you think you've been exposed [to COVID-19], put on a mask until you're sure [you're not sick]. If you're highly susceptible to severe disease and you're going grocery shopping, put on a mask to help yourself feel better. [And] it certainly makes sense for medical institutions, nursing homes, and retirement communities to consider mask mandates, because they're places where lots of people at high risk for serious disease are coming together." —Andrew Pekosz, virologist at Johns Hopkins University, on when to mask at this stage of the pandemic |