I exclude kids because they catch all kinds of things. Have you noticed a reduction in “colds and flu” in your orbit. IMO, it is mostly due to masks, hand sanitizers, staying out of crowds, and companies cleaning “public surfaces” commonly touched or used by lots of people. The down side is we are going get walloped when they return due to a loss of resistance.
You ask a very interesting and thought-provoking question. Come to think of it, neither myself nor anyone I know has complained of having so much as a slight head cold in so long long that I can't remember that last time I heard anyone mention it, or show any symptoms. Disclosure: I've had the Pfizer 'jab' -- both shots... and, before the end of this year, I'll have the booster as well. Whether there's any 'connection' I cannot say.
Yes. But I personally haven't been sick now in 4 years. My wife is in the same boat. I feel like I'm in the twilight zone.
I use hand cleaner (that 'clear' stuff) occasionally, but I wash my hands with soap and water a LOT, more than a dozen times a day... sometimes more. You've had two Moderna shots? I thought there was only one of that kind so far...(?)