It is SUCH a wily virus.
I was careful, had my shots, wore a mask in most public indoor situations, and so on. Wore a mask to teach last year (uncomfortable as that was) and the students also masked, so I got through the first round of Omicron here unscathed. But I sat beside someone who was positive and didn't know it for an entire afternoon class, passing papers back and forth, talking with her as part of a small group -- and voila. Here I am!
6 of 13 workshop participants have come down with the virus (so far) plus that person's husband. Phew! We were supposed to test immediately before coming but I guess she forgot to do so due to some truly difficult personal circumstances that distracted her. She had tested negative the day before.
My whole family had a virus in the spring that we couldn't be sure about -- we tested consistently negative (in my case, 10 times) but had the usual symptoms. In retrospect, though, I am pretty sure it was not Covid that time -- just a "regular" bad cold or flu, because this time the RAT test went BING to positive right away. I don't feel anywhere near as bad as I did in the spring, with whatever I had.
But I know it is hugely variable. My child also had Covid two weeks ago, also for the first time, somewhat miraculously, because they work with small children, hang around with people who are not that careful (they are 22) and ride public transit all the time. They are obviously much younger than I am, and they were much sicker. Ditto a couple of my Vancouver friends. One had a very high fever for over a week and had to stop work for two weeks; another is still coughing more than a month later. It's the luck (or bad luck) of the draw, it seems.