Fig. 2.

[A]Antigenemia and RT-PCR results according to the WHO clinical progression scale on samples obtained on the day of diagnosis, i.e. within 12 h since the RT-PCR. The red dotted line corresponds to the severity cut-off, as determined by the ROC curve analyze (see panel C). The gray dotted lines correspond to the positivity cut-off of each antigen assay. Medians are represented on top of each whisker box. [B] ROC curve analysis for AUC determination according to the hospitalization status and [C] to the severity status. The green line corresponds to N antigen results and the blue line to the Ct results.