Abstract
Previously, we found high species- and antigenic heterogeneity of spotted fever group rickettsiae circulating in the territories of the Russian Federation. This paper presents the results of the detection of antibodies to R. sibirica and R. conorii by using of complement fixation test and indirect immunofluorescent test (IFT) in the sera of patients after tick bites in tick-borne rickettsioses foci in border areas of Russia and Kazakhstan. The results of the study allow us to recommend carrying out the serological study of the blood sera of patients after tick’s bites using IFT with antigens of Rickettsia species, which circulation is proved or suspected in the area.