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Guidance. in may she announced vaccinated people could stop wearing masks indoors, drawing quick criticism that it was too soon. last february the white house had to clarify walensky's comment that teachers did not need to be fully vaccinated for schools to reopen. >> dr. walensky spoke to this in her personal capacity. >> reporter: now walensky is under fire for not following the cdc's own playbook for explaining new guidance. a biden covid adviser tells me the cdc has got to do a better job communicating what they're doing and why and that has to happen quickly. >> that's whapg when you lead...

Remains. our chief medical correspondent dr. sanjay gupta breaks it down for us. >> two different types of tests, pcr tests, the gold standard, that will find virus, that will find remnants of virus you could still be positive long after you are no longer contagious. the rapid antigen test we talk about, people often take at home, those are the ones that are more likely to answer the question people are really asking, am i still contagious? that's the answer that a throughout of people are wanting, they feel fine, but they want to know if they are still contagious. the cdc should be promoting ...

Cnn's gabe cohen has had. >> as we have articulated before cdc is working on updated guidance. >> reporter: the cdc director facing renewed criticism from within the white house and her own agency after yet another guidance gaffe. a source telling cnn that cdc scientists are increasingly frustrated with walensky's handling of guidance and between her circumventing their vetting process for guidelines and the public criticism morale at the agency is sinking. >> it really had a lot to do with what we thought people would be able to tolerate. >> reporter: it comes after the cdc cut the covid isol...

Vaccinated? >> we do have one district here -- we have two districts, actually, here in georgia that have required their employees to be vaccinated. we believe that vaccination is one of the best tools we have and that we all should be using that tool from our toolbox, along with masks. we think masks are at the minimum should be the requirement in all of our educational sites, our school buses, cafeterias when our children aren't eating and especially in our classrooms. >> lisa morgan, thank you for being with us with the georgia association of educators. >> thank you. as the omicron varian...

>> now cdc and the present administration won't even acknowledge natural immunity which is every bit as effective as getting the vaccination and between the two about 85% of our population has immunity, so we need to be dealing with that and working with that and giving people the actual numbers and letting them make decisions, mandate -- maria: and that was dr. ben carson on the program last month discussing natural immunity. he, of course, is a specialist in neurology. i'm back with dr. stephen hoge from moderna. dr. hoge, how much immunity does a person have if they've already had covid, wo...