A hypersensitivity reaction happens when the immune system mistakenly identifies harmless substances as harmful. There are several types of hypersensitivity reactions, depending on the class of ...

Drug hypersensitivity reactions are drug reactions which are unpredictable. They result from an interaction between a drug substance and the immune system of a hypersensitive person. Hypersensitivity ...

Rheumatoid arthritis is associated with an atypical immune response called a type 3 hypersensitivity reaction. This reaction happens due to immune complexes in the body. It can be treated by ...