accelerated reaction

ac·cel·er·at·ed re·ac·tion

a response occurring in a shorter time than expected; the cutaneous manifestations occurring during the period between the second and tenth days following smallpox vaccination; because it is intermediate between a primary reaction and an immediate reaction, it is regarded as evidence of some degree of resistance. Synonym(s): vaccinoid reaction

ac·cel·er·at·ed re·ac·tion

(ak-selĕr-ā-tĕd rē-akshŭn) Response occurring in a shorter time than expected; the cutaneous manifestations occurring during the period between the second and tenth days following smallpox vaccination; because it is intermediate between a primary reaction and an immediate reaction, regarded as evidence of a degree of resistance.