Which of the following describes a primary immune response?
A. It is a very rapid response.
B. It is carried out by memory cells.
C. It takes several weeks.
D. It requires re-exposure to an antigen.
E. It prevents a person from developing a disease from the antigen.
C. It takes several weeks.
A primary immune response takes several weeks to make memory cells that are later active in the secondary response.
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