Abstract

Within the last 60 years in the region studied the joint inhabitance zone of I. ricinus and I. persulcatus displaced in the North-East direction and the D. reticulatus natural habitat significantly expanded to the North- West. These regional changes depend on the temperature rise of climate, the decrease of precipitation and change of species and age of afforestation. Decay of epidemiologic stress of natural foci of the tick borne encephalitis, Lyme disease, and strengthening the epizootologic valency of foci of pyroplasmosis, nuttaliosis as well as epidemiologic f importance of natural foci of tularemia of meadowfield type would be expected in further expansion of the boundaries of I. ricinus, D. reticulatus natural habitat and contraction of the inhabitance zone of I. persulcatus on the territories cleared of the latter species.

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