Immunological hypersensitivity

Hypersensitivity reactions include both allergies, intolerances and certain autoimmune illnesses.

Hypersensitivities are classified into four main types, with a fifth type also recognized.

Hypersensitivity types

 * Type I: Immediate reaction
 * Type II: Antibody-mediated reaction
 * Type III: Immune complex-mediated
 * Type IV: Cell-mediated or delayed-type reaction
 * Type V: Antibody

Hypersensitivity illnesses
Examples according to hypersensitivity type include:
 * Type I: Allergy including food allergies, asthma, may cause anaphylaxis
 * Type II: Autoimmune hemolytic anemia, myasthenia gravis, acute rheumatic fever
 * Type III: Lupus, and post-streptococcal glomerulonephritis.
 * Type IV: Multiple sclerosis, rheumatoid arthritis
 * Type V: Autoimmune, e.g. Graves' disease

Learn more

 * Hypersensitivity: an overview