Uncommon Infections in Children Suggest Underlying Immunodeficiency: A Case of Infective Endocarditis in a 3-Year-Old Male

Table 2

Immune assessment B cell subsets.

Lymphocyte subsets	Level	Reference range
% CD19 (B cells)	0%	13–39%
CD19 (B cells)	0  cells/mcL	370–2306 cells/mcL