The BioPlex 2200 SARS-CoV-2 IgG Panel (BIO-RAD, Hercules, California, USA) is a multiplex immunoassay for the qualitative detection and semi-quantitative differentiation of IgG against the RBD, S1, S2 and N proteins of SARS-CoV-2. Results < 10U/mL are reported as negative and ≥ 10 U/mL as positive. The measuring range for the assay is 1–100 U/mL. Results outside of this range are reported as < 1 U/mL or > 100 U/mL.
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