PTPRC and COVID-19: Comparison of CD45 expression on granulocytes, lymphocytes, and monocytes from COVID-19 patients and healthy volunteers demonstrate an increased CD45 expression on granulocytes (MFI and SEM; 36,252 ±1113 vs. 26,898 ± 2985; p = 0.0017) and on lymphocytes (165,919 ± 2715 vs. 119,202 ± 8970; p < 0.0001) from COVID-19 patients, but decreased expression on monocytes (134,756 ± 3536 vs. 209,266 ± 15,953; p < 0.0001).