Allergies are over-reactions of the immune system in certain individuals to seemingly and generally harmless foreign proteins and substances. Allergies usually do not occur at the first exposure. When ...
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 ...
Most people experience no complications during a blood transfusion, but some have adverse reactions during or after treatment. Examples include a fever, chills, itching, or breathing difficulty.