In our home we've had 4 "bugs" since September; The first a respiratory thing my daughter alone had, 5 weeks later another respiratory one which primarily affected me, though my wife had some very mild symptoms. Early in December we all had a "covid-esque" which made me achey and very tired by each afternoon for a week, distorted taste perception at the end of it. Similar symptoms all, in varying degrees. We were topping up on D and zinc, and my wife took one dose of ivermectin, no dire events. (though I began hitting the aspirin on account of aches targetting my lower back) Most recently we all had a "variant" with nearly no symptoms at all save snot - gobs of it. 

These are most probably the result of 2 years of varying degrees of isolation, insofar as the seasonal bugs sure didn't cease to exist, they were lurking round somewhere, and once there was incrementally more "mixing", they all hit at once. Problem is, the immune system needs to be sampling its environment to function properly, and if kept in isolation too long, getting smacked with a few year's backlog of pathogens all at once can make for severe consequences. This reality was brought home to me around 25 years ago, when a colleague began working in the same office as me, after living on a rather small island for the 20 years prior. For the first 3 years here, he literally caught every little disease his son dragged home from school, most of which affected noone else in our group. The guy seemed continually sick, but a few years on and since, he's actually the picture of health.

Sooo, what to do? I strongly suggest that you all persistently and clearly remind each and every one of your analytically-challenged, muzzle-wearing associates how this proves their muzzles are utterly useless. And for that matter, whatever shots they might have been stupid enough to accept.