[Ecology of Rickettsia and epidemiology of rickettsioses].

Questions of ecology of obligate-transmissible rickettsioses causative agents and their natural environment--organism of blood-sucking arthropoda (ixodes, gamasid ticks, harvest ticks, lices, fleas) are considered. In tick organism Rickettsia are propagated, and transphase and transovarial transmission of rickettsia maintains population in natural focuses. The relationship between Rickettsia ecology and rickettsioses epidemiology is evident. Data about new-revealed and recurrent rickettsioses and role of molecular-biological and genetical methods of Rickettsia detection are represented. Biological and social factors having influence on appearance of new and recurrent rickettsioses are determined with the aim of their prediction.