(CNN) President Donald Trump, who says he and first lady Melania Trump have tested positive for coronavirus, has several risk factors for more severe Covid-19 symptoms.
He is in a high-risk group simply by virtue of his age -- he is 74 -- and his weight. Trump is clinically obese, and obesity is a risk factor for a more severe form of the illness.
According to the US Centers for Disease Control and Prevention, people in the 65-74 age range face a five times greater risk of hospitalization and a 90 times greater risk of death from Covid-19 compared to young adults between the ages of 18-29.
Based on his physical in April, CNN reported in June that President Trump weighed 244 pounds and is 6 feet 3 inches tall. That gives him a body mass index of 30.5, making him technically, if mildly, obese. Obesity triples the risk of hospitalization from Covid-19, according to the CDC.
Trump is also a male, and men are more likely to die or suffer severe illness from coronavirus than women, the leading health agency reported.
But it's not known if Trump has other medical conditions that could put him into a high-risk group.
According to his latest physical, his blood pressure is only slightly elevated. There is no evidence he has cancer, kidney disease, diabetes or other conditions known to put people at higher risk.
The President's physician, Dr. Sean Conley said his last physical was conducted in April, and "there were no findings of significance or changes to report."
After Trump's physical in 2018, Trump's then-physician Dr. Ronny Jackson said Trump underwent a coronary calcium CT scan as part of his routine physical exam. His score was 133, and anything over 100 indicates his arteries are at least partially blocked with plaque. According to Trump's official medical records, in 2009 his coronary calcium score was 34 and in 2013, it was 98.
The score of 133 revealed there had been a steady build-up of plaque in Trump's blood vessels, indicating moderate heart disease. But Trump has been taking statin drugs to lower his cholesterol and it was at normal levels at his last physical.
However, not everything about Trump's health is known.
Trump made an unannounced visit to Walter Reed National Military Medical Center on November 16, 2019, spending a little more than two hours undergoing health exams as part of his physical, a trip that was notably secretive, though.
In the memo about Trump's physical released in June, the White House physician said Trump underwent additional tests at the White House after the initial visit to Walter Reed.
At 50, first lady Melania Trump is not in the highest risk age category for more severe symptoms of Covid-19, but as people get older, the risk of becoming severely ill increases, according to the CDC. People aged 50 to 64 have a three times higher risk of being hospitalized with coronavirus and 30 times the risk of death compared to people 18 to 29.
The first lady, a former model, says she maintains a healthy diet and is in good shape.
She underwent a procedure in May 2018 for what the White House described as a benign kidney condition. The administration did not elaborate on the condition or the operation, described as an embolization procedure. Such procedures involve guiding a tube into an artery to non-invasively choke off blood flow to growths or tumors.
People with kidney disease of any stage are at an increased risk for severe illness from Covid-19, according to the National Kidney Foundation and the CDC. But it is unclear whether the first lady has kidney disease and if so, how serious it is.
Little else is known about her general health.
Most people never get seriously ill from coronavirus and it might take several days before it's clear whether either Trump or the first lady will even experience symptoms and, if they do, how serious they might be.
"It is going to take time for us to see what's going to happen with the President and first lady," former Baltimore Health Commissioner Dr. Leana Wen told CNN's Don Lemon.
"It's going to take maybe a week or so before they may develop symptoms," Wen, an emergency room doctor at George Washington Medical Center, said.
"Between the time they develop symptoms and between the time that they get very ill, we're talking about another week or two weeks after that," the emergency room doctor at George Washington Medical Center said.
"So, we are going to be waiting for a while to see what happens with the President of the United States."