But even some of the most vulnerable patients can fight their way through the disease.
Charlie Campbell's father, 89-year-old Eugene Campbell, has been diagnosed with the coronavirus and is hospitalised in Edmonds, Washington. Charlie Campbell said his father's doctor was cautiously optimistic, adding: "Under normal circumstances, he would discharge my dad, but these aren't normal circumstances."
Eugene Campbell came to the hospital from Life Care Centre, a nursing home in Kirkland that has been linked to a large share of the state's coronavirus deaths.
"We went and saw him yesterday and he looked pretty good," Campbell said, noting that his father is breathing normally and his vital signs and heart rate are good. "He may be the oldest person to recover from coronavirus."
In China, Tan Shiyun, a postgraduate student at a university in Wuhan, had travelled to her family home in Yichang more than 180 miles away when she began to experience minor symptoms from the virus.
She went to hospital, where she was given common cold medicine and sent home. It was only after her symptoms persisted and she visited the hospital a second time for an outpatient CT scan and received a call asking her to come back, did she understand her symptoms came from something other than the common flu.
After many days and a number of tests, doctors eventually told her the infection had spread to both of her lungs.
"After that, I felt a heavy head while walking, unable to breathe, and nauseous," Tan said in a video blog post. But after more than two weeks in the hospital, a CT scan showed her infection was disappearing and she was discharged.
For some who've been quarantined, anxiety and dread that they will become stigmatised by friends, neighbours and co-workers have equalled their concerns about their physical health. A few patients with the virus who were interviewed by The Associated Press — all of them passengers on the Diamond Princess cruise ship that ended up quarantined off Japan — described symptoms that were no stronger than a regular cold or flu.
"It's been a 2 on a scale of 10," said Carl Goldman, hospitalised in Omaha, Nebraska, since February 17, after developing a fever on a chartered flight from Japan to the US.
Goldman is staying hydrated with Gatorade. He said he continued coughing more than two weeks after he first got sick, but would probably only have missed one day of work if he had been diagnosed with the cold or flu. He stays active by pacing in his room, trying to match his pre-sickness routine of 10,000 daily steps on the pedometer.
"I totally get this is where I need to be and I need to be cleared of this before I'm released," he said.
American Greg Yerex, who was diagnosed along with his wife, Rose Yerex, on the Diamond Princess, said he had no symptoms and felt as healthy as he did on any other normal day.
"If I was home, I would be out doing everything I normally do," he said in an interview conducted via Facebook calls when the couple were still hospitalised in Nagoya, Japan. Rose Yerex tested negative when she got to the hospital.
For Greg Yerex, it was the couple's mental health that faced the biggest threat as they spent days in quarantine, isolated from friends and family and deprived of any direct human contact.
"It's like being a prisoner," he said. "You pace, you worry, you fret, you imagine all sorts of things. You have no control."
Greg Yerex said he and his wife, who have since been released from the hospital, plan to go to counselling to work through the mental stress they experienced.
Fellow cruise passenger Rebecca Frasure knows how they feel.
"I don't get to speak with anyone," she said in a Facebook call while still hospitalised in Nagoya. "I have a little window in my room, but cannot leave. The only contact I have is through Facebook messenger. I would never wish this on anyone."
Frasure said one of the things she found most frustrating was waiting for her test results to come back. Patients who have been diagnosed with the virus must have two consecutive negative tests before they can be released.
Frasure is now out of hospital, but is worried about being stigmatised by her home community.
"Are they going to be afraid?" she wondered. "Are they going to criticise me for being home, thinking I brought virus back with me?"
- AP