specific reaction

spe·cif·ic re·ac·tion

the phenomena produced by an agent that is identical with or immunologically related to the one that has already caused an alteration in capacity of the tissue to react.

spe·cif·ic re·ac·tion

(spĕ-sif'ik rē-ak'shŭn) The phenomena produced by an agent that is identical with or immunologically related to the one that has stimulated an immune response.