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That's a good question but I don't know how practical it is. We have 11.6 million diagnosed cases of covid-19 but it's estimated ~50 million people have been infected. Figuring out who those ~40 million are is difficult. The diagnosed 11.6 million is only 3.5% of the population. Sadly, another negative of our inadequate testing.If there was an easy way to tell who already had immunity (B and T cell, not just antibodies), we could allocate the available vaccines more efficiently. Someone who has had COVID likely already has immune response to last until the vaccines are more widely available.