You will note the lack of comment about T-cell memory in both of these papers. I believe it is T-cell immunity that offers the long lasting immunity to the disease. My recent blood test showing a complete lack of covid-19 antibodies despite me having been infected 6 months previously suggests that antibody immunity does not last longer than 6 months. This explains (to me at least) the recent rhetoric of having to get "booster" shots every year.

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Its all in the mitochondria.

Its the future and...you're not.