My wife and I stopped at 3 as well. Neither of us has ever had it either, at least not to our knowledge, although we both got very sick with what we later found were covid like symptoms during our annual Christmas at the beach trip in late December 2019 and early January 2020. This was a few weeks before the first confirmed case in the US so it probably wasn't covid but since neither of us gets sick very often, I've always wondered, what if?