Phenotypic and Genetic Characterization of a Novel Borrelia burgdorferi Sensu Lato Isolate from a Patient with Lyme Borreliosis

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Abstract
Borrelia burgdorferi sensu lato A14S was cultured from a skin biopsy specimen of a patient with erythema migrans in The Netherlands. This isolate had a unique DNA fingerprint pattern compared to 135 other B. burgdorferi sensu lato isolates. In this study, the isolate A14S was further characterized by protein analysis with sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and reactivity with various monoclonal antibodies. In addition, the 16S rRNA, ospA, and ospC genes, as well as the 5S-23S rRNA intergenic spacer DNA, were amplified by PCR, cloned, and sequenced. SDS-PAGE protein profiles and phylogenetic analysis based on all of the analyzed genes confirmed that B. burgdorferi sensu lato A14S was phenotypically and genetically different from the three human pathogenic species B. burgdorferi sensu stricto, Borrelia garinii, andBorrelia afzelii, as well as from other B. burgdorferi sensu lato species. Our findings indicate thatBorrelia genomic groups or isolates other than the three well-known human pathogenic species may also cause human Lyme borreliosis.

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