President Joe Biden’s Covid symptoms “continue to improve significantly,” his doctor said in a letter Sunday.

Dr. Kevin O’Connor, the White House physician, said that the president completed his third full day of treatment with the antiviral drug Paxlovid on Saturday and that his “predominant symptom” is only a sore throat. Biden, who tested positive for Covid on Thursday, had been fully vaccinated and twice boosted, the White House said.

“This is most likely a result of lymphoid activation as his body clears the virus, and is thus encouraging,” O’Connor said of Biden’s sore throat. “His rhinorrhea, cough and body aches have diminished considerably. His voice remains a bit deep. His pulse, blood pressure, respiratory rate and temperature all remain normal. His oxygen saturation continues to be excellent on room air. His lungs remain clear.” (Rhinorrhea is a runny nose.)

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