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  1. Immune System Function, Conditions & Disorders - Cleveland Clinic

  2. Primary immunodeficiency - Symptoms & causes - Mayo Clinic

  3. Your Immune System: How It Fights Infection to Keep You Well - WebMD

  4. Disorders of the Immune System - Johns Hopkins Medicine

  5. The immune system: Cells, tissues, function, and disease

  6. The Immune System - Johns Hopkins Medicine

  7. How to boost your immune system - Harvard Health

  8. In brief: How does the immune system work?

  9. Overview of the Immune System - National Institute of Allergy …