Hypersensitivity Reactions:. Hypersensitivity reactions : I nflammatory immune responses induced by repeated antigen exposure resulting in host tissue damage. Allergen : is a nonparasitic antigen capable of stimulating hypersensitivity reactions.
Inflammatory immune responses induced by repeated antigen exposure resulting in host tissue damage.
Skin, eye, Nasopharynx, Broncho pulmonary or GIT.
In Bloodstream: venom or toxin. Lethal effect.
IgG , IgM, Complement, and Cytotoxic cells are involved in this type of inflammation.
-Some types of food allergy.
-Prophylactic vaccine (animal antisera). Symptoms develop after 7-10 days and is self-limiting after clearance of the antigen.