I think if my mom hadn't gotten a bad tooth ache and been put on antibiotics she wouldn't have survived her hospital visit. She got sick, they tested her and said she didn't have covid. She got worst, they went back, they tested her again and told her it wasn't covid, they put her on antibiotics. During this time she started getting a tooth ache, it finally got so bad she had to go to the dentist, they told her she had an inflamed tooth and sent her to a specialist but all that brought on her second set of antibiotics for her infection in her tooth. Before she could get in to see the specialist to deal with the tooth she was still feeling sick. They went back to the doctor her had her put in the hospital for low sodium, there they tested her again and said it wasn't covid. After a week they sent her home and within two days she was back at the hospital with breathing problems. That time they told her she had a small case of covid. I was sure she was going to be gone because she did exactly what I was trying to tell her not to do but she just kept screaming at me she didn't have covid. When she got sick she said she'd never felt that sick before in her life which is what a few people have said about having covid so I was leaning towards the test being wrong, which she didn't believe or they were lying which she didn't believe. It was a highly contentious month between her and I. They put her on oxygen and the one of the new pills for covid, within three days she was out of the hospital. She is eighty, I think that tooth ache probably saved her life as the antibiotics, though not strongest were helping her immune system try and fight it off. When I've had bronchitis before doxycycline never worked very well for me and I'd often end up going back after not getting well. I think that's what happened with her, they were helping they just weren't strong enough to fight covid on it's own. I am sorry to hear about your father in law, it's alone the line of many of the stories you read about. Probably would have been story I'd be telling if my mom hadn't gotten that tooth ache.