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[A] Positive and negative antigen results in serum according to RT-PCR cycle threshold values in nasopharyngeal samples. The gray dotted line corresponds to a cycle threshold of 33. [B] Linear regression of cycle threshold results obtained by RT-PCR versus antigenemia measured on the Simoa. The gray dotted line on the Y-axis represents positivity cut-off for N antigens. The gray dotted line on the X-axis corresponds to a cycle threshold of 33.
