CD55 and hemolytic-uremic syndrome: CD55 and CD59 expression on leukocytes and their subsets (granulocytes, monocytes and lymphocytes) were significantly higher in all patient groups (GI, HUS and HUS/N) compared to HC (Fig. 1 B; 13558, 14849 and 13941 vs. 10805, p = 0.0022, p<0.0001 and p = 0.0001, respectively for CD55; 12870, 13451 and 12,514 vs. 11039, p = 0.0085, p = 0.0082 and p = 0.0174, respectively for CD59).