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In those first few days and dramatically diminishes as you get down to the second half of a ten-day frame. and so when asked about testing, what the cdc director said was if you look at the predictive value of an antigen test as to whether or not someone will transmit or not, there's no evidence that it has any predictive value. and for that reason, she said, they're not going to be requiring a test. >> right. >> just focus on wearing the mask. and that's the scientific basis of what she said and what the cdc recommendation is. >> well, i -- i have a couple questions from that. but let me star...

Improvements. >> and though mr. biden promised to restore confidence after the trump white house manipulated public health guidance for political ends, the cdc is under fire for messaging confusion. >> it's about the cdc toeing the line of whether or not we're basing our guidelines on science. >> on masking -- >> once you're fully vaccinated, two weeks after your last dose, you can shed your mask. >> the window for boosters. >> for up to six, eight -- perhaps, we don't know. >> six months. >> five months. >> most recently a change to recommendations that people infected with the virus isolate ...

Somewhat of a surge, presumably less than this surge. >> reporter: the cdc says the infected can end isolation if fever free, just five days after a positive test when, a study of infections in the nba suggests, more than one-third are probably still infectious. ending isolation at day five should include a negative rapid antigen test, tweeted one of the researchers. why do all the work to identify infections if we're going to just let them go back to work while still potentially infectious? as so many schools struggle to stay open, virginia's new governor will ban school mask mandates. a few ...

Vulnerable populations. >> harris: they haven't learned from the two years we suffered. those are the lessons you taught us. the cdc has updated guidance on isolation. this plays into the testing. it says that people who have recovered from covid and have isolated for at least five days can take a rapid test if they want to but don't have to. when asked why the agency didn't require a negative test for release after a short period the cdc said this. >> what we do know is that the pcr test after infection can be positive for up to 12 weeks. it won't be helpful. the question is why not do an ant...

Some of this may be clarified soon. but they say vaccinated or unvaccinated, stay at home at least five days. if you have covid-19. isolation can end if the symptoms are gone or resolving and then you need to wear a mask around others for five more days. if we had enough tests it seems pretty obvious that testing should be a component of determining when someone should come out of isolation. now, i will say there's different types of tests, i think this has been a source of confusion. the pcr tests they find the virus no matter what, even in people who clearly resolved their symptoms or no lon...