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Reactivity against peptides candidates from SARS-CoV-2 and HCoV-OC43 N proteins in healthcare workers with COVID-19 determined by ELISA assays. (a) Heatmap with OD450nm readings for each sample. Cutoff for negative binding was established at OD450 = 0.2. (b) Frequency of cross-reacting serum samples among all tested serum samples in healthcare workers with COVID-19.
