don't know how those tests perform whether they can predict whether you can transmit virus or not. >> in another interview on cnn, dr. wallensky says the new guidelines had a lot to do of what we thought people would be able to tolerate. dr. michael osterholm, good to see you as always. what's your take on the isolation down from 10 days to 5? it's more of what people can tolerate and getting people back to work and school. is it based on science in your view? >> well, willie, we have an imperfect situation that's going to require some imperfect responses. over the next three to four weeks, we'll see the number of cases in this country rise so