IntroductionIdiopathic CD4+ lymphocytopenia (ICL) is a rare immune disorder characterized by low levels of a specific type of white blood cell called CD4+ T lymphocytes. CD4+ T cells, also known as T helper cells, help coordinate the immune response by directing other immune cells to fight infections. In ICL, patients have fewer than 300 CD4+ T cells per microliter of blood (or less than 20% of...
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