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Background  The identification of the routes of dissemination of  Escherichia coli (E. coli)  O157 through a cohort of cattle is a critical step to control this pathogen at farm level. The aim of this study was to identify potential routes of dissemination of  E. coli  O157 using Multiple-Locus Variable number of tandem repeat Analysis (MLVA).    Results  Thirty-eight environmental and sixteen cattle faecal isolates, which were detected in four adjacent pens over a four-month period were sub-typed. MLVA could separate these isolates into broadly defined clusters consisting of twelve MLVA types. Strain diversity was observed within pens, individual cattle and the environment.    Conclusion  Application of MLVA is a broadly useful and convenient tool when applied to uncover the dissemination of  E. coli  O157 in the environment and in supporting improved on-farm management of this important pathogen. These data identified diverse strain types based on amplification of VNTR markers in each case.

bmc veterinary research

Multiple-locus variable number of tandem repeat analysis (MLVA) of Irish verocytotoxigenic Escherichia coliO157 from feedlot cattle: uncovering strain dissemination routes