When the maternal immune system becomes sensitized against antigens expressed by the fetus, what type of immune reaction occurs?
a. Autoimmune
b. Anaphylaxis
c. Alloimmune
d. Allergic
ANS: C
Alloimmunity can be observed during immunologic reactions against transfusions, transplanted tissue, or the fetus during pregnancy. Autoimmunity is a disturbance in the immunologic toler-ance of self-antigens. The most rapid and severe immediate hypersensitivity reaction is anaphy-laxis. An allergic response occurs related to exposure to an allergen.
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