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Confusion here. what kind of test is best to know if you're still contagious after that five-day period? >> good evening, david. thanks for having me back. the first five days after you test positive is the most important to isolate. that's when people are most contagious. the test that's useful after five days is one of those rapid antigen tests and what we know is that it's a very good test for picking up contagiousness and if you have two of those that are negative, very, very good information that you're not contagious anymore. >> again on that cdc language, they say if you choose to test,...

Factors into that piece of the new guidance. we know this administration is concerned and on do that of this situation with the shortage of tests. president biden himself hughes repeatedly acknowledged they have fallen short on this. i asked jeff zients today what is the process of getting those test to say americans. he told me they're still in the process of finalizing the contract for that test. that contract will not be finalized until late next week, so i don't think you can expect americans those to say tests under the middle of january. clearly this is something that will continue to be...

Missed. >> yeah, and look, to be clear, as i noted, biden has gotten testing to a better place than it was when he and ron klain in 2020 were criticizing trump for it. but we are not at the point, as klain promised about the biden plan that all americans have access to regular, reliable and free testing. we're not there, period. >> no, we're not, and i don't think that it's even been explained that well, the value of testing. instead, again, it's been minimized but the idea, jake, people talk about the pcr test, the gold standard test. very sensitive. will find presence of the virus. that's a ...

Categories of tests, and in each of those categories there's a bunch of manufacturers, a bunch of different ways you can do the tests. it's all awfully complicated for the average american to figure out. >> reporter: over-the-counter at home tests from these manufacturers are now authorized by the fda. experts say they all work well. >> in general for the purposes that most people are using tests today, which is to ask am i a risk to others around me, the rapid tests you can pick up on the shelf tend to perform very, very well for that use. >> reporter: there are three basic categories of test...

That is not explained and is most concerning. second, what they're saying is just not true. on one hand we're being told that the president and the country is precuring all these rapid tests that are going to help us, but on the other hand we're being told they're not going to. to fact is most of us believe if we're going to have to this five day you should have a rapid antigen that is a quality rapid antigen test, and i must highlight then. to then be able to show you're not shedding the virus. that's what those antigen tests do. they show when you're in that curve where if you walk out the d...