New lit review post, this one on #COVID19 antibody testing.https://srconstantin.github.io/2020/04/27/antibody-testing.html …
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Also, it depends what the antibody tests are being used for. As a population measure of how many people have been infected with COVID-19? They're good, PLEASE DO MOAR ANTIBODY TESTS.
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As a guide to clinical treatment of individual patients? Probably not great, since they'll show up negative even in infected patients for the first two weeks after symptom onset.
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As a guide to identifying who needs to be quarantined? Again, not ideal, because they'll miss newly infected patients (who are at their most contagious) but maybe better than nothing.
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My general heuristic of "don't trust claims by known COVID-19 Pollyannas" seems pretty vindicated by the facts here.
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Those are valid concerns. We don't have any idea how long antibody immunity will last -- the duration of antibodies varies a lot by virus, and COVID19 hasn't been around long enough to get those numbers yet.
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