Which condition is a type II hypersensitivity reaction?
a. Allergic rhinitis
b. Positive purified protein derivative (PPD) test for tuberculosis
c. Transfusion reaction to improper blood type
d. Serum sickness after receiving immune globulin
C
Common clinical situations caused by type II hypersensitivities include hemolytic transfusion reactions. Type II hypersensitivity reactions are caused by antibodies directed against body tis-sues that have some form of non-self (foreign) protein attached to them. Allergic rhinitis is an example of a type I hypersensitivity. A positive PPD test is an example of a type IV reaction. Serum sickness is a type III reaction.
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