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Phylogenetic tree based on the Borrelia burgdorferi sensu lato 5S-23S rRNA intergenic spacer fragment sequences. Scale bar indicates an evolutionary distance of 0.02 nucleotides per position in the sequence. Borrelia andersonii was used as outgroup. Numbers above the branches indicate bootstrap support indexes. Samples isolated from Ixodes persulcatus (Ip) and Dermacentor reticulatus (Dr) in this research are in boldface.
