Figure 3.
Neutralizing SARS-CoV-2 IgG, IgA, and IgM antibodies against S protein and RBD were found in variable levels in resolved and RT-PCR-negative study participants. Neutralizing SARS-CoV-2 antibody titers from resolved subjects (n = 153) were measured in the microneutralization assay and compared to (A) anti-S protein and (B) anti-RBD IgG antibody levels as measured in the SARS-CoV-2 ELISA. Neutralizing antibody titers are expressed as geometric MNT50 values (y-axis). ELISA values are shown as a ratio of observed optical density to the determined assay cut-off optical density (x-axis). (C) Neutralizing SARS-CoV-2 antibody titers from resolved subjects (n = 153) were measured in the microneutralization assay and were compared to their days since symptom onset. X-axis is expressed in log10. Values above 1 ratio are considered positive in the SARS-CoV-2 ELISA.