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That you know of. Asymptomatic cases are quite a large swath of what’s out there. If you can check your antibodies (beyond what a vaccine would give you) you’ll have a better picture of if you’ve ever had it or not. Sorry if I’m preaching to the choir here.

Blood tests only pick up Abs briefly, whether the Abs are from an infection or the vaccine. I had COVID in Jan 2020. In 2021 I got three Pfizer vaccines. My doctor did blood tests in ~April 2022 and I had zero SARS-CoV-2 Abs. The only way to really know is to test every week, multiple times if Sxs.