Kframe's norovirus thread reminded me of this: It's completely unscientific, and I'm my only data point, but after getting the OG covid19 back in 2019 (and a fairly potent case of it), I've simply had no illness of any consequence. I used to, like clockwork, get at least a couple of bad colds a year that would last a good week and knock me down. Since the OG, I've not had a single "real" cold. I can't help but think my natural immunity to the covid19 is protecting me against other covid forms. I've never taken a vaccine.
I've had a few instances where I felt like a cold was coming on, but at the most I took an airborne and Emergen-C cocktail, and maybe some night time Theraflu, and the next day was back to at least 90% if not 100%. I think one time it might have taken two days, but no entire weeks like before. Also, I'm currently in physical therapy, and about ten days ago when I was in, pretty much the entire staff there was sick. Sneezing, coughing, the works. I was actually kinda pissed off thinking I'd be getting sick for sure. Sure enough, a few days later I felt a tickle in my nose and what would normally be the beginning of something, but I took the cocktail and the next morning was fit as a fiddle.
Without more data, the null hypothesis would say "coincidence", but unscientifically, I can't help but think there's something to it.
