Anti-SARS-CoV-2 nucleocapsid antibody assay
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The presence of serum antibodies (IgM, IgG, and IgA) to the SARS-CoV-2 nucleocapsid protein were assessed at Days 1, 5, 10, and 29 using the Roche Elecsys® electrochemiluminescence immunoassay performed at a central laboratory (LabCorp, Inc.; Indianapolis, IN, USA).