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Why not testing come opponents was included in this guidance. did the shortage of rapid tests play a role in this decision? >> no, this decision really from the isolation standpoint had everything to do with the fact that we wouldn't change our guidance based on the result of that rapid test. >> so, wolf, the cdc is saying you still don't have to take a test. they're not recommending you take a test after testing positive, but if you take a test, it should change the way you behave and the way you determine whether or not you're staying in isolation. we should not confusing data, maybe the dat...

Explaining, both when they put out one version last week, then when they put out this version this week. this is what dr. walensky said on cnn. last week she was trying to emphasize that the cdc is following the science. >> this decision really from the isolation standpoint had everything to do with the fact that we wouldn't change our guidance based on the result of that rapid test. and you know that it didn't have anything to do with any shortage at all, because we recommend rapid tests for those in quarantine. >> so much back and forth here, but the bottom line, john, if you have covid, sta...

>> this decision really from the isolation standpoint had everything to do with the fact that we wouldn't change our guidance based on the result of that rapid test. >> out front now, dr. william schaffner, member of the cdc advisory committee on immun immunization practices and, doctor, i appreciate you as always. look, we all know there has ban lot of confusion over the guidelines from the cdc. do they need to be clearer on all of this? i mean, you know, to test or to test is optional? >> so, erin -- erin, balancing is very, very important. and the cdc is trying to balance the best science w...

As cnn's kaitlan collins also asked her about. >> did the shortage of rapid tests that we are seeing play a role in this decision? >> this decision really from the isolation standpoint had everything to do with the fact that we wouldn't change our guidance based on the result of that rapid test. and you know that it didn't have anything to do with the -- any shortage at all because we recommend rapid tests for those in quarantine. >> now, to be fair, public health always involves a balancing act between what the science says, what resources permit, what millions of exhausted and battered peopl...

Disincentive for home testing. telling people in so many words that a positive antigen test is serious but there is no need to take one. in fact, if you are feeling okay and just want to get out of the house already, don't go looking for answers you might not like. that's essentially what they are saying. now perhaps, some of this has to do with legitimate scientific concerns about false negatives and not wanting to give infected people a false sense of security. something dr. walensky spoke about last night. or perhaps, it is the simple fact that, useful or not, good luck even finding a home ...