President Biden tested positive for COVID-19 again on Thursday but feels “very well,” his physician, Kevin O’Connor, said in a new update two weeks after the president first tested positive.

Biden has tested positive for six days with a rebound COVID-19 infection that has been seen in some patients who take the antiviral treatment Paxlovid. He first tested positive for COVID-19 on July 21 and ended his isolation last week before testing positive again on Saturday.

“The President feels very well today. He is still experiencing a very occasional cough, but the cough is improving.