The quick response of the immune system to a second infection is due to the _____,a feature of the immune system as demonstrated by the success of vaccines.
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 cell.

Question

Quizplus · Accepted Answer

T and B memory cells are specialized cells produced after the first infection that can quickly recognize and respond to the same antigen upon re-exposure. This rapid response is the basis for the success of vaccines, which stimulate the production of memory cells against specific pathogens. Activation of macrophage cells or new cytotoxic T cells may contribute to the immune response, but they are not solely responsible for the quick response seen in a second infection. Suppression of suppressor cells and high levels of antigen are not features of the immune system that contribute to a rapid response to a second infection.

The Quick Response of the Immune System to a Second