focal reaction

fo·cal re·ac·tion

a reaction that occurs at the point of entrance of an infecting organism or of an injection, as in the Arthus phenomenon. Synonym(s): local reaction

fo·cal re·ac·tion

(fō'kăl rē-ak'shŭn) A reaction that occurs at the point of entrance of an infecting organism or of an injection, as in the Arthus phenomenon.
Synonym(s): local reaction.