Your Friend Reminds You That Hypersensitivity Is an Exaggerated Immune Response

Your friend reminds you that hypersensitivity is an exaggerated immune response that injures tissue and can be categorized into one of four groups according to the mechanisms and timing of the response. He tells you that seasonal allergies are an example of type I hypersensitivity and describes the characteristics of this response. What statement made by your friend is INCORRECT?

A) The effector cells involved in a type I response are B cells.
B) A very common form of IgE-mediated allergy is systemic anaphylaxis.
C) The mediators involved in the response include histidines, leukotrienes and prostaglandins.
D) Examples of type I hypersensitivities include hives, asthma, and anaphylactic shock.
E) Other cells involved in the response are basophils and mast cells.