CD86 and COVID-19: Surface expression of CD86 in classical (median ΔMFI, healthy: 6100 [IQR: 4500–6700], moderate: 10 000 [IQR: 9300–17 000], severe: 8400 [IQR: 5700–11 000]), and intermediate monocytes (healthy: 9500 [IQR: 8200–12 000], moderate: 19 000 [IQR: 15 000–25 000], severe: 16 000 [IQR: 11 000–19 000]) reached the maximum in moderate COVID‐19 patients as compared with healthy controls and severe COVID‐19 patients (Supporting information Figure S8).