President Donald Trump waves to supporters outside Walter Reed Medical Center on Sunday, October 4 in Bethesda, Maryland.

President Donald Trump leaves the White House for the Walter Reed National Military Medical Center on the South Lawn of the White House on October 2 in Washington, DC. Drew Angerer / Getty Images

After two briefings by President Trump’s doctors over the weekend, more details about the course of his Covid-19 disease will be revealed – but some questions remain open.

Here is a brief timeline of what we know so far:

Friday

Since announcing his illness on Twitter early Friday morning, the president has had frequent “ups and downs,” said White House Doctor Dr. Sean Conley, during a briefing at Walter Reed National Military Medical Center on Sunday.

On Thursday evening and into early Friday morning, Conley said the president was “only fine with mild symptoms” and that his oxygen levels were in his high 90s – but by late Friday morning “the president had a high fever and his oxygen saturation was temporarily below 94% “said Conley.

The president was given oxygen.

“And after about a minute with just two liters, his saturation level was back above 95%. It stayed there for maybe an hour and was gone and gone,” said Conley.

Later on Friday, Conley added, the president had risen and moved around the White House residence and had only mild symptoms.

On Friday afternoon, Conley said in a White House letter that Trump had received an antibody cocktail – a test treatment from biotech company Regeneron – and took zinc, vitamin D, the heartburn drug famotidine, melatonin, and a daily aspirin.

The President was taken to Walter Reed National Military Medical Center for surveillance.

The president has had no fever since Friday morning, said Dr. Sean Dooley, one of Trump’s doctors, during the briefing on Sunday. Still, his oxygen level was temporary again on Saturday.

Saturday

The president had a second episode in which his oxygen levels dropped.

“Yesterday there was another episode where it dropped to about 93%,” Conley said on Sunday. “We saw it and it came back up.”

Trump’s doctors decided to give him the corticosteroid dexamethasone, which has been shown to help patients with Covid-19 and which is usually given to patients on supplemental oxygen or ventilation.

Sunday

From Sunday around noon, Trump will be fine, said Dr. Brian Garibaldi, one of Trump’s doctors.

“He was up and down. Our plan for today is to get him to eat and drink, to get out of bed as much as possible to be mobile,” said Girabaldi. “And if he continues to look and feel as good as he does today, we hope we can plan a discharge to the White House tomorrow, where he can continue his treatment course.”