Fig. 4From: Evaluation of SARS-CoV-2 neutralizing antibodies using a vesicular stomatitis virus possessing SARS-CoV-2 spike proteinDetection of anti-S protein antibody by indirect ELISA. Test sera from 23 COVID-19 hospitalized patients (a) or 19 COVID-19 PCR-negative donors (b) was assayed. The O.D. at 450Â nm was measured using a microplate reader. The results shown are from three independent assays, with error bars representing standard deviations.Back to article page