The expression of HLA-DR on CD14 monocytes was strongly inhibited by COVID-19 plasma from patients with immune dysregulation but not by plasma from patients with an intermediate immune state of activation (Figures 5C–5F); the addition of the specific blocker of the IL-6 pathway Tocilizumab partially restored the expression of HLA-DR on monocytes of all patients with immune dysregulation (Figures 5E and 5F).