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Patel, an msnbc medical contributor. maura, what's the latest? what do we know? >> reporter: according to the first lady's communication director, she confirmed the first lady tested positive via pcr test. she developed mild symptoms yesterday evening, monday evening despite testing negative on monday morning, during one of her covid testing cadences that the president and first lady do. when she started feeling the symptoms, she tested negative on an antigen test but then positive via pcr test. she's on vacation with the president and some family members. we know hunter and his wife have been...

The first lady is 71 years old. we'll obviously be in touch with her office as the days go on to make sure we're updated on her symptoms. you managed they were planning on going back to the white house. he is still planning on traveling and signing the inflation reduction act into law this afternoon. the white house telling us the president tested negative with an antigen test this morning. we didn't see the first lady with the president when he went out for an outing in south carolina last night. we did see them together throughout the weekend. the white house advised in accordance with cdc g...

And viewers at home. we appreciate it. also new thrn mois morning,e is a new case of coronavirus in the white house, in this case the first lady, dr. jill biden. >> arlette, how is the first lady feeling? >> reporter: well, bianna and jim, first lady jill biden is experiencing mild symptoms after testing positive for covid-19. that's according to her communications director elizabeth alexander. the first lady started experiencing these symptoms last evening. and after testing negative on an antigen test, she tested positive on a pcr test. now, in a statement released by elizabeth alexander, ...

That group. >> we're talking about the cdc here. what about the fda and the new home-testing guidelines? >> yes. we've all gotten used to these at-home antigen tests. they are to be used serially. you should be using not just one but one after another after another if you get a negative result. a pcr result, when you're infected, a pcr is going to be right 95% of the time if you're truly infected, it'll say, yep, there's the virus. the antigen test will be right only 80% of the time. that's a significant difference. but if you keep using them, don't just rely on one, keep using them, have a lo...

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