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RE: Why don’t we check for one’s antigen /antibody levels before and after (few weeks or months later) the person was vaccinated for Covid? Would it be useful to provide better correlation for the effectiveness of the vaccine against Covid infection?
Not even remotely spam.
Spam: unsolicited usually commercial messages (such as emails, text messages, or Internet postings) sent to a large number of recipients or posted in a large number of places.
I've only posted my answer in two places: Quora and here. That is not spam.