Characterization of a spotted fever group Rickettsia from Ixodes ricinus ticks in Sweden.

Journal of Clinical Microbiology
Kenneth NilssonC Påhlson

Abstract

A spotted fever group rickettsia isolated from the common tick, Ixodes ricinus, was genetically characterized by PCR and genomic sequencing. This study was performed with nymphal and adult ticks collected in southern and central Sweden. I. ricinus is the only North European tick species of medical importance which is regularly collected from humans. No species of the genus Rickettsia has previously been found in Scandinavian ticks, nor has any case of domestic rickettsial infection in humans or animals been reported. According to the nucleotide sequencing, the present Rickettsia sp. belongs to the spotted fever group of rickettsiae. Ticks are the most common arthropod reservoirs and vectors of the rickettsiae of this group. Among 748 ticks investigated, 13 (1.7%) were positive for a Rickettsia sp. Borrelia burgdorferi was detected in 52 (7%) of the ticks, a prevalence similar to or somewhat lower than that previously been recorded in other Swedish studies. There was no evidence of ehrlichial or chlamydial DNA in these ticks. The Rickettsia sp. was further characterized by 16S ribosomal DNA (rDNA) sequencing and restriction fragment length polymorphism (RFLP). The 16S rDNA sequencing resulted in a sequence identical to that desc...Continue Reading

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Citations

Jun 14, 2002·Microbiology and Immunology·Hiroshi SatohChiharu Morita
Apr 3, 2009·APMIS : Acta Pathologica, Microbiologica, Et Immunologica Scandinavica·Nedaa HajemCarl Påhlson
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Jan 16, 1999·Journal of Clinical Microbiology·K NilssonC Påhlson

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