[Characteristics of the relation of tick-borne encephalitis morbidity to natural factors].

Data and tendencies characteristic of relationship between the severity of the course of tick-borne encephalitis and a number of biotic and climatic factors have been revealed by the method of information analysis. On the basis of relationships established in this study the authors make a suggestion concerning two most important stages in the formation and manifestation of the clinical features of tick-borne encephalitis in different areas of endemic territories, linked, on one hand, with the population selection of the infective agent and, on the other hand, with temperature conditions and the duration of the cold season.