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A fact sheet that provides an overview of how the immune system functions and describes the actions of biological therapies.

How CDC uses antigenic characterization as part of global flu surveillance and to select viruses for use in the seasonal flu vaccine.

Autoimmune diseases result from a dysfunction of the immune system.

Overview of immunoglobulin A vasculitis, also called Henoch-Schönlein purpura, a disease that causes small blood vessels to become inflamed and leak.

Overview of anti-GBM disease, a rare autoimmune disorder that affects the kidneys and lungs and can be fatal if not treated promptly.