Volume 74, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


Thirty-one rickettsial isolates from ticks or patients in North Asian tick typhus (NATT) foci from the Ural region to the Russian Far East were obtained at the Omsk Research Institute of Natural Foci Infections between 1954 and 2001. Using citrate synthase () and outermenbrane protein a () gene sequencing, we identified these isolates as (25 isolates), strain BJ-90 (2 isolates), (1 isolate), and (3 isolates). We demonstrate that ticks should be considered potential vectors of NATT. We also demonstrate the presence of in Ural and in Siberia and Russian Far East, where they may cause human infections misdiagnosed as cases of NATT. Clinicians should be aware that several spotted fever rickettsioses with different prognoses coexist in Russia in areas where NATT was the only previously recognized rickettsiosis.


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  • Received : 10 Jan 2005
  • Accepted : 25 Aug 2005

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