Outside experts pointed to the therapies as signs that the president’s health may not be as good as his doctors said. His age, weight and gender put him at high risk.

President Trump will stay at Walter Reed military hospital for an indefinite number of days, his doctor said on Saturday, undergoing a five-day antiviral drug regimen for Covid-19 that indicated his condition might be more serious than had been publicly disclosed. On Thursday, he received another therapy that is still in early phases of testing.

Medical experts who have been following the sketchy, conflicting details released by the White House and Walter Reed about the president’s condition were divided about the experimental treatments Mr. Trump, 74, has received. And although they said it was hard to comment on Mr. Trump’s condition or evaluate his treatment given the limited and contradictory information, some said they were worried.

At a news conference on Saturday outside the medical center, Dr. Sean P. Conley, Mr. Trump’s physician, painted a very positive picture of the president’s condition, saying he was doing well, fever-free and not in need of supplemental oxygen. Continue reading.