Biden tests positive for COVID. Here are details about his diagnosis and treatment. – CBS News

President Biden has tested positive for COVID-19, the White House confirmed Wednesday, prompting an array of questions about his health and condition.

White House press secretary Karine Jean-Pierre said the president is vaccinated and boosted and is experiencing mild symptoms.

"He will be returning to Delaware where he will self-isolate and will continue to carry out all of his duties fully during that time," she said. "The White House will provide regular updates on the president's status as he continues to carry out the full duties of the office while in isolation."

Here's what else we know so far:

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In an update Friday, Biden's doctor said the president's primary symptoms of hoarseness and cough "have improved meaningfully."

"His pulse, blood pressure, respiratory rate and temperature remain absolutely normal. His oxygen saturation continues to be excellent on room air. His lungs remain clear," the letter continued.

This adds on fromThursday's update,where his doctor said the president does not have a fever and his vital signs remain normal.

In a previous note distributed by the White House, Biden's doctor said the president had mild upper respiratory symptoms Wednesday afternoon, including a runny nose and a "non-productive cough."

The doctor said Biden's respiratory rate, temperature and pulse oximetry were all normal at the time.

Biden "felt okay" for his first event in Nevada but was tested for COVID after not feeling better, the note added.

The president told reporters before departing Las Vegas, "I feel good." In a social media post, Biden thanked people for their well wishes and said that he will "continue to work to get the job done for the American people" while recovering.

As of Friday, the president has completed his fourth dose of Paxlovid, a medication used to treat COVID.

The U.S. Centers for Disease Control and Preventionrecommendspeople with a respiratory virus stay home and away from others if experiencing symptoms. The agency said patients can resume normal activities when symptoms are improving and they have not had a fever for at least 24 hours.

It is unknown what variant Biden has, as identification is "still pending," according to an update from his doctor Friday.

There have, however, been recent projections of the latest variants across the U.S.

On Friday, the CDC projected that the KP.3 and KP.3.1.1 strainsare now more than half of infections nationwide. Behind them are theKP.2andLB.1variants two close relatives that are descendants of the JN.1 strain that dominated infections this past winter which make up just over 30% of infections.

CBS News chief medical correspondent Dr. Jonathan LaPook told CBS News' John Dickerson Wednesday evening that he was "very interested" that Biden had been given a dose of Paxlovid.

"He has been on a blood thinner called apixaban, which is Eliquis," said LaPook. "And Eliquis does have an interaction with Paxlovid, which is why you have to be very careful when you give the two together. The Paxlovid can increase the level of the Eliquis."

Aside from potential health complications, the diagnosis has already caused waves on a campaign level.

CBS News senior White House correspondent Weijia Jiang reported Wednesday that the diagnosis marks "a big development at a time when the president is already dealing with so much politically."

"He has a grueling travel schedule, and now he has to focus on getting better from COVID," Jiang said.

Several top Biden administration officials have also tested positive for COVID-19 in recent weeks, including second gentleman Doug Emhoff and Health and Human Services Secretary Xavier Becerra.

On Thursday, Dr. Jill Biden's press secretary Vanessa Valdivia said in a statement that "the First Lady is tested as determined appropriate by her doctor. She is not symptomatic and up to date with her vaccines. She is currently in Rehoboth."

The nation isexperiencing a summer surgeof COVID, and the CDC reported last week that more than half of states are seeing "high" or "very high" levels of SARS-CoV-2, the virus that causes COVID-19, in wastewater testing.

Editor's note: A previous version of the story incorrectly stated that first lady Jill Biden had been tested for COVID-19 and was asymptomatic.

Melissa Quinn and Alex Tin contributed to this report.

Sara Moniuszko is a health and lifestyle reporter at CBSNews.com. Previously, she wrote for USA Today, where she was selected to help launch the newspaper's wellness vertical. She now covers breaking and trending news for CBS News' HealthWatch.

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Biden tests positive for COVID. Here are details about his diagnosis and treatment. - CBS News