The quick response of the immune system to a second infection is due to
A) activation of macrophage cells.
B) suppression of suppressor cells.
C) T and B memory cells.
D) high levels of antigen.
E) new cytotoxic T cells.

Question

Quizplus · Accepted Answer

T and B memory cells are specifically designed to recognize and respond to an antigen they have encountered before. Upon a second exposure to the same antigen, these memory cells rapidly mount a response, leading to a quicker and more effective immune response. This is the basis for vaccination, where the immune system is deliberately exposed to a weakened or harmless form of a pathogen, generating memory cells that can provide protection against future infections. The other options listed do not specifically explain the mechanism of the quick response to a second infection.

The Quick Response of the Immune System to a Second