Patients with critical COVID-19 also had higher peak of plasma C-reactive protein (CRP) during hospitalization (321 [212–377] vs. 103 [78–167] mg/l), longer hospital stays (33 [17–96] vs. 6 [5–10] days) and higher rates of death (14/30 [47%] vs. 0/26 [0%]), need for mechanical ventilation (25/30 [83%] vs. 0/26 [0%]), and acute kidney injury (16/30 [53%] vs. 4/26 [15%]) as compared with non-critical patients (Table 1). Here, CRP is linked to COVID-19.