The number of 60-bp repetitions in the arp gene was determined as described previously [14, 15] and amplification of the

tprE, G, and J genes, using nested PCR, was done according to Pillay et al. [15] with two modifications HDAC inhibitor described in Flasarová et al. [17]. The RFLP analysis was carried out according to Pillay et al. [15]. DNA isolated from T. pallidum strain Nichols (Houston) was used as a control for CDC (arp/tprEGJ) and sequence-based genotyping (TP0136/TP0548/23S rRNA). Statistical methods Standard methods derived from the binomial distribution, including two-tailed tests were used. An interactive calculation tool for chi-square tests of “goodness of fit” and independence was used [54]. Availability of supporting data All sequences identified by sequence-based typing of TP0136, TP0548 and 23S rDNA loci are described in an Additional file 1. Acknowledgements The authors thank Pavlína Krečmerová for performing the statistical analysis. This work was supported by grants from the Ministry of Health of the Czech Republic (NT11159-5/2010 to DS and NS10292-3 to IK), by the Grant Agency of

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