WASHINGTON: U.S. first lady Jill Biden has tested negative for COVID-19 and will return to Washington from Delaware on Aug. 30, a spokeswoman said on Monday.

Jill Biden, 71, had tested positive in a rebound case of COVID-19 after first testing positive on Aug. 16.

She had ended her first isolation after a course of Paxlovid, an antiviral medication, which has proven to be highly effective at preventing serious disease and death among those at highest risk from COVID-19. A minority of those prescribed the drug, however, have experienced a rebound case of the virus a few days after their initial recovery.

President Joe Biden, 79, recovered from a rebound case of the virus on Aug. 7. (Reporting by Nandita Bose in Washington; Editing by Lincoln Feast.)