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Anti-SARS CoV-2 antibodies response. Serum samples from study participants were analyzed for antibodies to the receptor binding domain (RBD) of the spike protein and the nucleocapsid (N) protein by enzyme-linked immunosorbent assay. Shown are the optical density (OD) values for the individual study participants. Only those samples which had an OD above the cut-off were considered positive and are indicated in red.
