re: Not Enough Research of the Protection Levels of Natural Immunity of Infection

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I think the problem is that there are likely a lot of false positive tests out there, so you can't really study the effectiveness of prior infection if you can't be sure who was really infected.

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That's simply not true.

You have to do an active study though. You have to identify people who have had positive tests and who show an antibody response. Then you have to track them over time like you do with the vaccine studies.