[Main features of natural focality of ixodid tick-borne borreliosis in Russia].

In a general form the "key" data on natural focality of ixodid tick-borne borrelioses and ecology of their agents--B. burgdorferi s. 1. in Russia, which have been accumulated by now, are presented. Vectors and reservoir hosts of different species of Borrelia, as well as a landscape preference of natural foci and ecological factors, determining risk of human infection, are characterized.