Immunological memory accounts for
A) the human body's ability to distinguish self from nonself.
B) the observation that some strains of the pathogen that causes dengue fever cause worse disease than others.
C) the ability of a helper T cell to signal B cells via cytokines.
D) the ancient observation that someone who had recovered from the plague could safely care for those newly diseased.
E) the ability of the immune system to present antigen fragments in association with MHC antigens.

Question

Quizplus · Accepted Answer

Immunological memory is the ability of the immune system to "remember" previous encounters with a pathogen and mount a faster and more effective response upon subsequent exposure. This can explain why someone who has recovered from a disease, such as the plague, would be immune to future infections and able to care for the newly diseased without getting sick themselves.

Therefore, the best choice is D.

Immunological Memory Accounts for