IL6 and COVID-19: Regarding the composite endpoint 28-day mortality and/or intubation, Microcode performed similar to the known COVID-19 biomarker IL6 [24] (AUC [95% CI] 0.90 [0.86–0.94, p < 0.0001] vs. IL6 0.88 [0.83–0.92, p < 0.0001]) (Fig. 5A).