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Evidence and experts to help you understand today’s public health news—and what it means for tomorrow.

Jul 17, 2020

Are people who test positive for weeks, or even months still infectious? Are face shields more effective than masks? If COVID-19 is airborne, does this mean we don’t have to be as concerned about surfaces? If a person tests positive multiple times, is each new test considered a new “case?” If you’re sick with COVID and you wear a mask, will you get sicker because you’re breathing in more virus? Would the virus disappear if everyone quarantined?

Dr. Caitlin Rivers from the Center for Health Security and Dr. Josh Sharfstein address your questions submitted to