A vaccine is protective in that it takes the place of:
A)genetic immunity to the pathogen
B)the second exposure to the pathogen
C)the helper T cells and macrophages
D)the first exposure to the pathogen

Question

Quizplus · Accepted Answer

A vaccine is designed to mimic the first exposure to a pathogen by introducing a weakened or dead version of the pathogen to the immune system. This allows the immune system to develop a memory response without causing illness. Therefore, the vaccine takes the place of the first exposure to the pathogen, which is necessary for the immune system to mount a protective response.

A Vaccine Is Protective in That It Takes the Place