https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/burden.html https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/burd... CDC estimated that 1/4 covi

https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/burden.html https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/burd... CDC estimated that 1/4 covid infections had an associated positive test. I did the same kind of napkin math you're referring too for Floridia a few months back and they'd could have been at 80% of the population with some level of immunity. But napkin math probably isn't a good way to run a pandemic response. Just like herd immunity doesn't really matter at an individual level.