US First Lady Jill Biden tested positive for Covid-19 and was experiencing mild symptoms, the White House said.
The 72-year-old, who is vaccinated and has received boosters, will stay at home in Rehoboth Beach, Delaware, where she and President Joe Biden spent part of the weekend.
The president tested negative for the virus on both Mond and Tuesday.
He travelled back to Washington DC on his own on Monday night.
Mrs Biden will remain in Delaware the rest of the week.
The president, 80, “will test at a regular cadence this week and monitor for symptoms”, White House Press Secretary Karine Jean-Pierre said on Tuesday.
He is not experiencing any symptoms so far and is in “close consultation with his physician”.