Breaking: President Joe Biden has tested positive for COVID-19.

President Joe Biden tested positive for Covid-19 on Wednesday and is experiencing mild symptoms, according to the White House.

Biden, 81, tested positive following his first event in Las Vegas, where he was expected to later speak at the UnidosUS annual conference. The president’s doctor said Biden has received his first dose of Paxlovid, and will be self-isolating at his home in Rehoboth Beach, Delaware, in line with US Centers for Disease Control and Prevention guidance.

“The President presented this afternoon with upper respiratory symptoms, to include rhinorhea (runny nose) and non-productive cough, with general mailaise,” a note from Biden’s doctor provided by White House press secretary Karine Jean-Pierre said. “He felt okay for his first event of the day, but given that he was not feeling better, point of care testing for COVID-19 was conducted, and the results were positive for the COVID-19 virus.”

The White House’s confirmation followed an announcement at the conference by UnidosUS President and CEO Janet Murguía, after Biden was an hour and a half late to his scheduled appearance.

“I was just on the phone with President Biden. And he shared his deep disappointment at not being able to join us this afternoon. The president has been at many events as we all know and he just tested positive for Covid,” Murguía told attendees.