I suspect many of the people who think they haven’t had it actually have had it, and just didn’t test early/often enough or thought they just had a cold or stomach flu. My receptionist thought she had allergies at first last time she had Covid. But I can honestly say it’s been over three years since I had so much as a sniffle - NO kind of illness or allergies whatsoever. Thankfully I’m fully vaccinated and the Paxlovid I started today is already kicking in, so should be mild.