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Positive conversion of IgM in primary immunization and secondary immunization. (A) Longitudinal positive conversion of anti-SARS-CoV-2 IgM antibodies. (B) Positive conversion rates of anti-SARS-CoV-2 IgM antibodies in primary immunization and secondary immunization. The McNemar test was used to compare paired positive conversion between primary immunization and secondary immunization. Abbreviations: NEG: negative, POS: positive.
