That is probably why I’m healthy, and those that have been vaccinated are sickly. I’m 67 years old and haven’t even had a cold for close to 50 years.
My dad was like just like you…..until he contracted Meningitis (Haemophilus influenzae type b (Hib)). He'd tell you about it but he's dead now. BTW there is a vaccine for Hib. Too bad my dad didn't get it.
I’ve been in contact with every kind of contamination you can imagine, with no problem.
I was Resident Engineer on a sewage treatment plant upgrade project where I regularly had to enter and examine structures that you probably would not have been willing to get within 1000 feet of.
Your dad probably used an antibiotic, which wipes out your immune system for a year or more.