Several days after an initial contact with an antigen, antibody blood levels increases. This is a ________.

A) primer response
B) primary response
C) precipitating response
D) principle response
E) cascade response

Antibody Blood Levels

The concentration of antibodies in the bloodstream, indicative of the body's immune response either to infections or to vaccines.

Antigen

A substance that when introduced into the body stimulates the production of an antibody, can be toxins, bacteria, foreign blood cells, and the cells of transplanted organs.

Primary Response

Immune response that occurs as a result of the first exposure to an antigen.