Fig. 2.

HCP binds SARS-CoV-2 antigen and neutralizes infection. (a) The ability of HCP to bind the indicated SARS-CoV-2 antigens were determined by a multiplex Magpix assay as described in the methods. Normal human serum and serum against SARS-CoV-2 was used as the negative (-) control and positive (+) controls. (b) Neutralization activity of anti-SARS-CoV-2 convalescent human plasma was evaluated for by plaque reduction assay. Geometric mean PRNT₈₀ titres were plotted from eleven different replicates. The geometric mean titre and SEM are plotted. The limit of quantitation was 40. (c) PSVNA50 and 80 titres were determined. The dashed line indicates limit of detection.