Anaphylaxis generally refers to the '''systemic anaphylactic reaction''', which is a severe [[Type I Hypersensitivity|type 1 hypersensitivity]] reaction after the animal has become sensitised to a substance. | Anaphylaxis generally refers to the '''systemic anaphylactic reaction''', which is a severe [[Type I Hypersensitivity|type 1 hypersensitivity]] reaction after the animal has become sensitised to a substance. |