CD19 and cytomegalovirus infection: Absolute lymphocyte counts (ALC) were low in 5/23 (%) patients, who had concomitant CMV infection or autoimmune hemolytic anemia or hemophagocytic lymphohistiocytosis (HLH), Median CD3+ T lymphocyte counts were 2.017 x109/L (67.3%) (IQR 1.48- 3.59 x109/L, range: 0.43 - 10.6 x109/L), while median CD19+ B lymphocyte counts were 0.38x109/L (10.44%) (IQR 0.154 - 0.716 x109/L, range: 0.04 - 2.17 x109/L).