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A novel duplex real-time PCR permits simultaneous detection and differentiation of Borrelia miyamotoi and Borrelia burgdorferi sensu lato
Venczel, R. ...
Purpose For simultaneous detection of Borrelia miyamotoi (relapsing fever spirochete) and Borrelia burgdorferi sensu lato, we have developed a duplex real-time PCR targeting the flagellin gene (flaB; ...p41), a locus frequently used in routine diagnostic PCR for B. burgdorferi s.l. detection. Methods Primers and probes were designed using multiple alignments of flaB sequences of B. miyamotoi and B. burgdorferi s.l. species. The sensitivity and specificity of primers and probes were determined using serial dilutions (ranging from 104 to 10−1) of B. miyamotoi and B. burgdorferi s.l. DNA and of several species of relapsing fever spirochetes. Conventional PCR on recG and glpQ and sequencing of p41 PCR products were used to confirm the species assignment. Results The detection limit of both singleplex and duplex PCR was 10 genome equivalents except for B. spielmanii and two B. garinii genotypes which showed a detection limit of 102 genome equivalents. There was no cross reactivity of the B. miyamotoi primers/probes with B. burgdorferi s.l. DNA, while the B. burgdorferi s.l. primer/probe generated a signal with B. hermsii DNA. Out of 2341 Ixodes ricinus ticks from Germany and Slovakia that were screened simultaneously for the presence of B. miyamotoi and B. burgdorferi s.l., 52 were positive for B. miyamotoi and 276 for B. burgdorferi s.l., denoting an average prevalence of 2.2 % for B. miyamotoi and 11.8 % for B. burgdorferi s.l., and B. miyamotoi DNA was also detectable by PCR using artificial clinical samples. Conclusion The duplex real-time PCR developed here represents a method that permits simultaneous detection and differentiation of B. burgdorferi s.l. and B. miyamotoi in environmental and potentially clinical samples.
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