2 weeks and 4 weeks: We make 2 different antibodies in response to viral infections. The 1st is IgM within about 2 weeks of exposure. At 4-6 weeks IgG against COVID appears and IgM diminishes. The problem is we dont seem to develop long term immunity like we do with Chickenpox or Epstein Barr.
Answered 12/6/2020
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