The Immune System
The immune system involves a complex network of organs, cells and proteins located throughout the body, to defend against infections from germs (such as bacteria, viruses, fungi, parasites), and other invaders (such as cancer cells), while protecting the body’s own cells. In most people, their immune system is an effective network that responds and adapts to defend the body against infections and cancer. However, some people have immune system disorders which interrupt this protective process. Immune system disorders are caused by dysfunction which can result in overactive immune responses (allergy or autoimmunity) or underactive immune systems (immune deficiency).
How Allergies Work - A short animated video about allergies and the immune system developed by the National Allergy Strategy
Fast Facts about the Immune System Updated June 2023
Webpage updated November 2023