Which statements are correct concerning vaccines and toxoids? (Select all that apply.)
a. They are biologic agents that produce active immunization.
b. They are biologic agents that produce passive immunization.
c. They are prepared with animal serum.
d. They are considered a blood product.
e. They are only used in children.
ANS: A, C
Vaccines and toxoids are biologic agents used in the routine schedule of active immunization for adults and children. Many biologic agents are prepared with animal serum.
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