In the course of investigations, on the basis of climatic division of the country, performed on the season-related morbidity rate of infections of the respiratory ways among organized and not organized in nurseries and kindergartens children, and after comparative stud of the morbidity rate and air temperature in the city of Varna, the authors reached the conclusion for the significant role played by the natural factor, accounting for the manifestation of a number of biological and social entities, having an essential bearing on the mechanism of contagion transmitting.
The seasonal dependence is considered as a form of manifestation of the essence of the epidemic process in anthroponoses, capable of developing in the temperate climatic zone merely.
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