requirement at the end of those five days. let's first listen to what cdc director dr. rochelle walensky said on cnn this morning about that. >> we opted not do have the rapid test for isolation because we actually don't know how our rapid tests perform and how well they predict whether you're transmissible during the end of disease. the fda has not authorized them for that use. wet don't know how they perform. what we said was, well, if you got a rapid test at five days and it was negative, we weren't convinced you weren't still transmissible. we didn't want do leave a false sense of security, we still wanted you to wear the mask. if it was positive, i don't know the maximum amount of transmission is behind you. we still wanted you to wear as mack. given that we weren't going to change our recommendations based on the results of that rapid test, we opted not to include it. >> dr. mina, i know you've been a vocal advocate for rapid testing. what do you make of walensky's