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Detection of anti-RBD IgG and IgM antibodies by indirect ELISA. (a) IgG data obtained from the same serum panels as those in Figure 3. IgM testing with or without IgG depletion from three representative COVID-19 patient sera known to have high (b), medium (c) and low (d) IgG antibody levels. Also included are two healthy controls and one SARS patient serum (e). Data are presented as fold of change (Fc) over the average reading of negative controls.
