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Serological panel titers (a) SARS-CoV-2 NAb levels were obtained using a sera panel composed of 40 samples (10 samples for each: negative, low, medium, and high titers). (b) Correlation of SARS-CoV-2 NAb levels obtained from a panel of 40 samples titrated by PRNT-SARS-CoV-2 in two independent assays performed on different days. Linear regression shows a positive correlation (r = 0.9655) that is statistically significant (p < 0.0001) between assay repetitions.
