A 6-month-old baby has suffered from recurrent bacterial infections.Flow cytometry results indicate a lack of B cells but presence of normally functioning T cells.Which is the most likely diagnosis?

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Recurrent bacterial infections in a 6-month-old baby with a lack of B cells but presence of functional T cells is consistent with the diagnosis of Bruton's agammaglobulinemia. This condition is caused by a mutation in the gene responsible for B-cell development, leading to an inability to produce antibodies and increased susceptibility to bacterial infections. DiGeorge syndrome and common variable hypogammaglobulinemia can also present with recurrent infections, but they typically have both B- and T-cell abnormalities. SCID typically presents with severe and life-threatening infections in the first few months of life and can involve both B and T cells.

A 6-Month-Old Baby Has Suffered from Recurrent Bacterial Infections