Hypersensitivity, Overview of the 4 Types, Animation.

Hypersensitivity refers to abnormal reactions of the immune system against certain antigens. It includes exaggerated reactions to otherwise harmless environmental antigens, commonly known as allergies; and inappropriate reactions against the body’s own antigens, or autoimmune diseases. Reactions can range from a mild rash, to damaged organs, to fatal anaphylactic shock. There are 2 principal groups…