Biden \"continues to be very specifically conscientious to protect any of the Executive Residence, White House, Secret Service and other staff whose duties require any (albeit socially distanced) proximity to him,\" O'Connor wrote in his memo on Wednesday.

Biden will increase his testing cadence in light of the possibility of a Paxlovid \"rebound,\" O'Connor wrote, referring to a seemingly rare but increasingly reported phenomenon in which COVID symptoms recur or there is the development of a new positive viral test after having tested negative.

The president is fully vaccinated and has received two booster shots, but at the age of 79 was considered to be at a higher risk for severe illness.

Dr. Ashish Jha, the White House COVID-19 response coordinator, stressed after Biden's diagnosis that all Americans should take advantage of vaccinations and treatments courses.

\"This is a president who's double-vaccinated, double-boosted, getting treatments that are widely available to Americans and has at this moment a mild respiratory illness,\" Jha told ABC's \"This Week\" on Sunday. \"This is really good news, and this is both vaccines and treatments that are available to everyone. Really important that people go out and get vaccinated and avail themselves of these treatments if they get infected.\"

The first lady and Vice President Kamala Harris both tested negative for COVID-19 after spending time with Biden before his diagnosis.

ABC News' Mary Bruce, Alexandra Hutzler, Arielle Mitropoulos, Molly Nagle and Emily Shapiro contributed to this report.

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