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  1. ...the end).. we gain our immunity against infections in 3 ways: by ...from the infection (being COVID -19 survivor).. by vaccination...it is called post -acute- COVID -19-syndrome...

    5 Answers · Health · 02/02/2021

  2. ... Immunity and Cellular Immunity .. so how long Cellular Immunity against COVID -19 last?.. we simply do not know.. because COVID -19 is a new illness, just...

    3 Answers · Science & Mathematics · 13/02/2021

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