Features of the Epidemiological Situation on Siberian Tick Typhus and other Tick-Borne Ricketsioses in the Russian Federation, Prognosis for 2019

The review presents an analysis of the epidemic situation on infections of rickettsial etiology, the causative agents of which are transmitted by Ixodidae ticks in the territory of the Russian Federation. The data obtained through molecular-biological verification allow to unite under the name of “tick-borne ricketsioses” a group of infections caused by R. sibirica subsp. sibirica, R. conorii, R. heilongjiangensis and other species of rickettsiae circulating in natural foci of various regions of Russia. Cases of tick-borne rickettsioses in Siberia and the Far East, caused by various species of rickettsiae, are registered under the name of “Siberian tick-borne typhus” due to the lack of available methods of differential laboratory diagnostics. The paper presents the assessment of the incidence of Siberian tick-borne typhus, indicating not only the varying degrees of epidemic hazard of endemic regions, but also changes in the distribution of risk areas, including the identification of new, epidemically significant foci. In accordance with the risk-oriented approach to prophylaxis, forecasting of epidemic situation on tick-borne rickettsioses was given and differentiation of the endemic territories of the Russian Federation as regards Siberian tick-borne typhus was carried out with distinguishing of epidemiological zones of low, medium, above average, high and very high risk of population infection