will be far and away the most dominant virus. >> doctor, we'll see if you can help clarify these new cdc guidelines. this was my question from the moment the new guidance was put out. do you have to be asymptomatic the entire time after you test positive in order to leave isolation on day five, or do you have to be asymptomatic by day five? >> asymptomatic by day five. certainly without fever. if you have a few other symptoms, still having some cough, as long as they're -- that cut on is diminishing, you're okay. >> all right. thank you. appreciate everything that you're helping us understand here. later this hour, we'll talk to a mayor about how her city's hospitals and schools are navigating this coronavirus spike. but let's turn back to mike. i want to ask about some other breaking news we mentioned at the top of the hour. the white house confirmed just