[Transmissible and natural infections in Siberia and the Far East].

The common and specific features in the time course and structure of morbidity as regards tick-borne rickettsiasis, tick-borne encephalitis, and Lyme disease in Siberia and Far East are discussed. The differentiation of nosological areas of tick-borne rickettsiasis and encephalitis is demonstrated and 9 variants of ratios of epidemiological zones of different hazard of infection established. The subject of comparative epidemiology of focal infections is formulated. General conceptual approaches to epidemiologic survey as the basis for optimizing preventive measures are outlined.