1. How is hypersensitivity best defined?
2. What is a hypersensitivity reaction that produces an allergic response called?
3. The common hay fever allergy is expressed through a reaction that is mediated by which class of immunoglobulins?
4. What are blood transfusion reactions an example of?
5. During an IgE-mediated hypersensitivity reaction, which leukocyte is activated?