On Sunday night, Cassie took to her own Instagram account with details on Colton's condition given symptoms of the virus tend to be a cough, fever and difficulty breathing.
"Colton is feeling a little bit worse today. He's been sleeping all day long," Cassie admitted in an Instagram Stories video.
"He said it's been a little bit difficult for him to breathe deeply and I think he's just really tired and gets really winded easily, so he's just been laying in bed and sleeping most of the day."
Cassie said her boyfriend is secluded on the third floor in her family's home in Huntington Beach, CA. She told fans that Colton was given an inhaler and frequently checks his oxygen and blood levels with an oximeter.
"Everyone else in my family is feeling okay and we're hanging in there, and that is it," Cassie noted.
A couple of hours later, Cassie posted on Instagram Stories that Colton had just asked for a snack and so his appetite seemed to be returning.
Earlier that day, Cassie disclosed on Instagram, "I'm taking care of him by bringing him anything he needs (food, medicine, water, blankets, games), and then I disinfect myself every time I leave him. But I'm not 'hanging out' up there per se -- unfortunately," according to the U.K.'s Daily Mail.
"Everyone else is quarantined in the rest of the house & yard."
She reportedly added, "It's hard because he wasn't isolated from us until we got his results back. We quarantined the entire family together as soon as he showed symptoms, because we assumed that we were already exposed. And now we are like... 'Is it too late to not catch it? Do we already have it?'...we just don't know."
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Cassie therefore said her family has implemented precautions recommended by Centers for Disease Control, including taking vitamins and getting plenty of sleep.
"No one else is showing symptoms. Yet, at least," Cassie said, according to Daily Mail. "I feel like it's been hard to tell if any of us are symptomatic or if we are just being paranoid and imagining symptoms?"
Cassie said her younger brother Landon, for example, was reportedly experiencing "a little bit of chest pain," but maybe it was just "anxiety."
When asked where Colton might have contracted coronavirus, Cassie reportedly explained, "No idea where he got it from. At this point, it could have been anywhere that he was the past 2 weeks. Whether it be from a stranger that he touched the same door handle as, or from a friend, someone in my family."
Cassie also revealed how Colton's symptoms developed.
"It started out with a headache," she reportedly wrote on Instagram, followed by "body aches and mild fever" and then "night sweats for the next 2 nights with the fever."
Cassie said Colton then "started feeling some shortness of breath" and later "started coughing, but only very mildly," Daily Mail reported. She added that Colton "has been pretty weak and tired the whole time."
Colton told his Instagram followers on Friday he began experiencing the symptoms earlier in the week.
Ali recalled the coronavirus test being "intense" and "not pleasant." She explained a swab had been stuck up both of her nostrils multiple times -- which apparently hurt and caused her to tear up -- and she also received a respiratory test.
The coronavirus outbreak has led major cities, including Massachusetts and New York City, to shut down restaurants, bars, schools and businesses as the number of confirmed cases rises.
When Colton starred on The Bachelor in 2019, his season ended prematurely when he fell in love with and selected Cassie over his other two remaining bachelorettes, Tayshia Adams and Hannah Godwin.
Colton had made up his mind before even finishing out his round of overnight Fantasy Suite dates.
Cassie, however, attempted to quit The Bachelor when Colton was prepared to give her the final rose. Cassie didn't feel ready to get engaged after dating Colton for such a short period of time, and so he fought for her to stay and took pressure off the table.
Cassie was hesitant to continue but decided to stick around for Colton, and then she proceeded to meet his family on the show and fall in love with him once filming wrapped.
Colton and Cassie are still dating and going strong, but Cassie has admitted on numerous occasions she feels no rush to live with Colton or get engaged, although she says she can definitely envision a future with him.