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We don't know that covid antibody response is temporary
Antibodies either disappear or lessen greatly in a couple of months. There are apparently other ways to become immune to a virus and those appear longer lasting (t cells).
There was a single study that I read that followed antibody decline. They found significant decline in overall antibodies (>70%), but only an 8-12% decline in neutralizing antibodies (the ones that give immunity) after 3+ months. Considering 100% of the virus was removed, and 1/2
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