IgM are the first antibodies made in response to an infection, then IgG and IgA. All of these require B cells to have come into contact with the pathogen. When a person encounters the pathogen for the first time, the body makes IgM. Then those B cells are stimulated to change and make IgG. It is the IgG-producing B cells that provide the memory response to rapidly engage a previously encountered pathogen and neutralize it before infection can happen. I discuss some of this here: https://medium.com/@ngough_bioserendipity/antibodies-to-sars-cov-2-are-some-people-already-immune-d8f7980c10a5

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