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A bit under half of Americans have already caught covid. Even without vaccines, that means nearly half of Americans already have natural immunity which is vast

• beerandt 5y ago
  >A bit under half of Americans have already caught covid No- that many have had a positive test or other diagnosis confirming covid. There were plenty of non-hospitalized, non-diagnosed cases before the tests existed. And plenty of people have had it and never saw a reason to get a test to confirm it. I'd say we're far above that estimated number.
  • sjwalter 5y ago
    So that's not quite true. The CDC provides the estimate you're talking about which is what my post originally cites (~146mm Americans infected). That's their estimate based on the much smaller number of positive tests and hospitalizations, using their models about how many cases are missed by surveillance.