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  1. Primary immunodeficiency - Symptoms & causes - Mayo Clinic

  2. Immunodeficiency Disorders: Symptoms, Types, and More - Healthline

  3. Overview of Immunodeficiency Disorders - Immune Disorders

  4. Primary immunodeficiency - Diagnosis & treatment - Mayo Clinic

  5. Primary Immunodeficiency: Types & Symptoms - Cleveland Clinic

  6. Immunodeficiency - Wikipedia

  7. Overview of Immunodeficiency Disorders - The Merck Manuals

  8. Overview of Immunodeficiency Disorders - The Merck Manuals

  9. Immunodeficiency - StatPearls - NCBI Bookshelf

  10. Types of Primary Immune Deficiency Diseases