The studies of the level of Ixodidae ticks infestation and seroepidemiological parameters made it possible to characterize specific features of the epidemic process in foci with different tick species. A working principle for the typing of the natural foci of tick-borne rickettsiosis has been suggested. According to the number of tick species 3 types of foci have been identified: monovector, divector and polyvector foci.