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Plant-derive HEV/RBD detects IgG in serum samples from COVID-19-recovered patients (n = 24). Results are presented as optical density value (OD) of analyzed sera. The serum dilution was 1:80. A cut-off for positivity (0.059, indicated by a dotted line) was determined as two standard deviations above the mean optical density of pre-pandemic sera (n = 10), the serum dilution was 1:80.
