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A total of 594 COVID-19 samples were collected after 4 weeks of SARS−COV-2 detection and 100 pre-COVID samples were tested as control sera. Antibodies titre median at 95 % confidence interval were shown for Architect i200SR (A), Cobas e411 (B) and iFlash 1800 (C). A compiled receiver operating characteristic (ROC) curve was plotted to compare the diagnostic accuracy (D). Dotted lines are indicating respective cut-off values.
