Those COVID-19 patients admitted to an ICU had higher body temperature (38.2 ± 0.2 vs. 37.5 ± 0.1 °C; p = 0.011; threshold: ≤ 38 °C; Fig. 4) as well as elevated levels of CRP (11.7 ± 2.0 vs. 5.0 ± 0.7 mg/dl; p = 0.0003; threshold: ≤ 5 mg/dl; Fig. 4), LDH (468.7 ± 45.5 vs. 334.4 ± 27.9 U/l; p = 0.0004; threshold: ≤ 249 U/l; Fig. 4) and IL-6 (237.1 ± 116.2 vs. 49.4 ± 12.6 pg/ml; p = 0.0002; threshold: ≤ 5.9 pg/ml; Fig. 4) than COVID-19 patients not admitted to an ICU (Non-ICU-COVID-19 subgroup). Here, CRP is linked to COVID-19.