US President Joe Biden has tested positive for Covid-19 for the second time

President Joe Biden tested positive for Covid by antigen testing late Saturday morning, after testing negative for several days in a row, according to a letter from his doctor.

“After testing negative on Tuesday evening, Wednesday morning, Thursday morning, and Friday morning, the President tested positive by antigen testing late Saturday morning, indicating’rebound’ positivity,” wrote White House physician Dr. Kevin O’Connor.

Biden, 79, has not experienced any recurrence of symptoms and is still feeling well, according to O’Connor. “With this in mind, there is no reason to restart treatment at this time, but we will obviously keep a close eye on things.”

He will, however, return to strict isolation procedures, the doctor added.

“Folks, today I tested positive for COVID again. This happens with a small minority of folks,” the president tweeted Saturday. “I’ve got no symptoms but I am going to isolate for the safety of everyone around me. I’m still at work, and will be back on the road soon.” Biden said.