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Plant‐derived SARS‐CoV‐2 EMS and S VLPs detect IgG in serum samples from COVID‐19 recovered patients (n = 24). The results for EMS and S are indicated by red and green dots, respectively. Results are presented as optical density value (OD) of analysed sera. A cut‐off for positivity was determined as two standard deviations above the mean optical density of pre‐pandemic sera (n = 24; blue dots) indicated by a blue dotted line.
