A Booster Shot of the Tetanus Vaccine is Required Every

Question

A booster shot of the tetanus vaccine is required every 10 years because
A)secondary exposure is necessary for immunological memory.
B)memory cells are apoptotic following infection.
C)the primary immune response is slow.
D)memory cells specific for the tetanus toxin do not last longer than a decade.
E)the tetanus toxin has grown resistant to previous vaccines.

Accepted Answer

Memory cells specific for the tetanus toxin do not last longer than a decade, and thus a booster shot is necessary every 10 years to maintain adequate levels of immunity.