Abstract
A total of 18 variably-presented gene clusters (LVPCs) and nine previously characterized variable-number tandem repeats (VNTRs), and all known virulence markers were screened for their frequency and/or copy number in 251 global strains of Vibrio parahaemolyticus using PCR and gel or capillary electrophoresis. A two-step genotyping approach combining the use of LVPCs and VNTRs was established accordingly. The frequency profiles of LVPCs and virulence markers were primarily used to group the strains into six distinct complexes with different potential pathogenicity natures. The strains from each of these complexes were further analyzed with VNTRs to give a much more detailed discrimination of the strains. A genetic fingerprint-like database of a large collection of strains established with this two-stage approach would be very useful for identification, genotyping, origin tracing, and risk estimation of V. parahaemolyticus.
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