In contrast, the expression of CXCR2 on CD74+ Tregs (mean: healthy 15.9%, mild 37.5%, severe 42.4%) as well as on CD74+ convCD4+ T cells (mean: healthy 16.3%, mild 42.1%, severe 39.1%) was enhanced in COVID-19 patients (Figure 3D). Here, CXCR2 is linked to COVID-19.