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Sequential antibody testing of three VNT-positive COVID symptomatic individuals. Samples were taken for up to 93 or 97 days post symptom onset from three COVID-19 symptomatic individuals tested in Figure 1. Serum was tested using (A) VNT, (B) IDVET ELISA, and (C) Whole Antigen ELISA. The dotted line represents test cut-off values of 2.83 IC50, 0.215 OD450nm, and 0.49 ΔOD450nm for the VNT, SARS-CoV-2-N ELISA, and Whole Ag ELISA, respectively.
