Giardia duodenalis Infection and Pachymeningitis in a Patient With Agammaglobulinemia.
X-linked agammaglobulinemia (XLA) is a rare immunodeficiency caused by a mutation in Bruton's tyrosine kinase, resulting in profoundly low immunoglobulin levels and susceptibility to recurrent infections. We report a 14-year-old patient with XLA who presented with persistent fever, bloody diarrhea, and headache suggest...