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Selective IgA deficiency is the most common immunodeficiency, and it is characterized by decreased IgA levels, with normal levels of IgG and IgM. Patients are prone to infections of the airway and GI tract, with a notable increase in Giardia infections. Other findings observed include allergic rhinitis and atopy. Most importantly, patients can experience anaphylaxis after the administration of IgA-containing products such as blood.
Learn about Selective IgA Deficiency and other immunodeficiencies with Pixorize's USMLE mnemonics. Part of our Immunodeficiencies playlist for the USMLE Step 1 exam.
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