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Concordance assessment for the overall agreement and kappa (k) among all IgG ELISA tests. (A) Overall agreement, (B) agreement in samples collected ≤14 DPSO/DPD, (C) agreement in samples collected 14–30 DPSO/DPD, (D) agreement in samples collected >30 DPSO/DPD, (E) agreement in samples collected from symptomatic coronavirus disease 2019 (COVID-19) patients, (F) agreement in samples collected from asymptomatic COVID-19 patients.
