CD19 and lymphopenia: Lymphopenia was observed, with a median value of total lymphocyte count of 0.9 G/L (IQR [0.6-1.3]), affecting CD3+ cells (median 0.6 G/L [0.4-0.9]), CD4+ cells (median 0.4 G/L [0.2-0.6]), CD8+ cells (median 0.2 G/L [0.1-0.3]), NK cells (median 0.1 G/L [0.1-0.2]), and CD19+ cells (median 0.1 G/L [0.1-0.2]).