My doctor referred to Elementary schools as “Petrie dishes” and she was so right! Every year I would get a terrible sore throat cold in October and then again after the December Book Fair I always ran (ALL THE KIDS + a parent/family night + handling money handled by small children. The ONLY time I didn’t get sick was when we were teaching virtual. When the whole school population returned in September 2021, I lasted 3 days before getting sick, and that was WITH a mask! So yes, schools contribute to spreading illness and I can understand where lack of exposure to the common things had a possible negative impact on the immune system. I live with high risk folks so I always took precautions. I also relied on elderberry syrup along with required vaccines because, as Lightly Roasted said, our diets & eating habits are basically trash and I’m trying to rely a bit more on adding traditional natural herbal meds to supplement.
Take care of yourself & stay armed with what our darlings refer to as “hanitizer”. And seriously, try the elderberry thing unless your doctor says no. They have it as gummies now. (No, this is not “medical” advice as I am NOT a doctor, nor did I sleep at a Holiday Inn Express! Just sharing what seemed to work for me and others I know. As always, follow the advice of your medical practitioner.)