From Big Medical Encyclopedia

SPORADIC INCIDENCE (Greek sporadikos scattered, separate) — the incidence, to-ry is usual for this infectious disease in this country (area) at this level of its historical development.

This classical definition of L. V. Gromashevsky (1941) for decades did not undergo any basic changes.

Considering that at each disease the S. z., in the big settlement tens of cases of respiratory viral diseases can be estimated as S. z. The same number of cases of a typhoid or cholera is an indicator of epidemic flash or even epidemics (see). At quantitative assessment epidemic process (see) in attention also social and economic level of development is accepted about-va. The incidence which is constantly registered in pre-revolutionary Russia sypny and a typhoid, estimated while sporadic, would be considered as sharply expressed epidemic demanding urgent presently anti-epidemic actions (see). In the same way quantitative assessment of incidence (see. Infectious diseases ) depends on the area, the country. Sporadic (single) incidence of plague or cholera in the countries (areas), endemic by these diseases, will be considered as epidemic flash or epidemic in the countries where these diseases usually do not meet.

Thus, sporadic incidence for each disease, in each country, for its certain regions and at the certain level of historical development has the quantitative indices.

Bibliography: Gromashevsky L. V. The general epidemiology, page 129, M. — L., 1941.

V. M. Rozhdestvensky.