IL6 and bacterial infectious disease: Significantly higher median levels of IL-6 were observed in the group of bacterial infections in the first days of the ICU stay, with the highest median levels on the day of ICU admission (3900.5 ng/L [IQR: 984.0–44,140.0] vs. 145.0 ng/L [IQR: 68.4–190.0]; p < 0.001).