From Big Medical Encyclopedia

REINFECTION (Latin re-the prefix meaning repetition, resuming, + late lat. infectio infection) — repeated infection with the same type of the activator, as at the first disease, again caused infectious process.

The river develops more often when primary inf. process does not leave behind rather intense and long immunity (see), napr, after transferred dysentery (see), salmonellosis (see), or at partial loss of immunity, napr, against tifoparatifozny diseases (see. Typhoid ).

Distinguish the homologous and heterological River. If repeated inf. process arises owing to new infection with the activator of the same look, as primary, speak about the homologous (true) River. Understand repeated development as heterological R. inf. process at hit in an organism of the activator of other subspecies or a serotype, napr, after the postponed dysentery caused by Fleksner's shigella of subspecies of Newcastle the dysentery caused by Fleksner's shigella of subspecies of Boyd develops.

Because the immune response of an organism is rather expressed against a certain type of the activator and at the same time is longer sufficient tension of cellular and humoral immunity remains, homologous R. is observed considerably less than heterological, and usually not earlier than in one year after primary inf. process.

Differentiate homologous R. with heterological with the help serol. a method of identification of bacteria of contagiums (see. Serological researches ).

A wedge, manifestations of reinfection are, as a rule, less expressed, than at primary inf. process.

See also Infection .

Bibliography: The multivolume guide to microbiology, clinic and epidemiology of infectious diseases, under the editorship of H. N. Shukova-Verezhnikova, t. 4, page 32, M., 1964; Pokrovsk V. I. and d river. Artificial immunity and infectious process, M., 1979.

S.G. Pak.