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boosted. let's get back over to the white house to get an update from cnn's jeremy diamond. jeremy, what is the latest you're hearing? >> reporter: we just received a letter from joe biden's physician, dr. kevin o connor, confirming the news that the white house put out, saying that joe biden has tested positive for covid. he writes that the president tested positive this morning as part of our routine screening program. he says he tested positive on an antigen test that was confirmed via pcr testing. he confirmed what we reported on air just last hour, which is that the president is...

>> we're not going to say anything. we have people in our community. >> i just want your reaction that you will respond to the decision. >> right. we're going to be -- we're going to be very respectful to the family. >> reporter: i understand the understand to speak to the parents. >> just sow know we will do that, whenever this is done, if the families are greening, we will do that. just so eb knows, we have been in contact with dps every day. every day. i'm on the phone with him every day. >> what is your reaction? >> have a good day. >> reporter: what is your reaction, sir? >> as ...

A short paper, "Persistent False Positive COVID-19 Rapid Antigen Tests,” caught my eye in the Feb. 22 New England Journal of Medicine.

BALTIMORE — People can test themselves about as accurately at home with rapid antigen coronavirus tests as health care professional using the same tests, according to a Johns Hopkins Medicine-led study published online this week. In the study, which involved nearly 1,000 patients seen at the Baltimore Convention Center Field Hospital during a five-month period in 2022, researchers found that ...

A new study from the University of Wisconsin School of Medicine and Public Health discovered air sampling detects COVID-19 and flu levels effectively.