In rereading what I wrote on 12-06, I said that I had come down with a nasty flu. That's what I thought it was as I had a fever of 102 F at the start and a home test yielded a negative result, and I'd heard that with Covid, the fever was lower, around 100.5 F. A few days later, when the fever had passed and I was feeling better, a friend suggested that I take a lab test to be sure. So I did. And the surprise was that I tested positive. That explains the lingering cough...
It's a bugger for sure. Glad you are on the mend!