Washington DC - First lady Jill Biden on Monday tested positive for Covid-19, the White House said, with her husband, President Joe Biden, so far not affected.

Jill Biden is experiencing "only mild symptoms," her office said, and will remain in the couple's home in Rehoboth Beach, Delaware.

The 72-year-old last tested positive for Covid a year ago.

President Biden, meanwhile, was administered a Covid test Monday evening and tested negative, the White House said, adding that he will continue regular testing and monitor for symptoms.

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He also tested positive last year in July, then experienced a rebound after initially being cleared. The 80-year-old eventually came out of isolation in early August 2022.

The US has been experiencing a rise in Covid cases and hospitalizations in recent weeks, with several new variants under observation.

Biden was in Philadelphia on Labor Day, delivering a speech and taking a shipyard tour. He is also set to travel to the G20 summit in India on Thursday.