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The genomic fingerprints of 26 Escherichia coli O157:H7 isolates from calves on 20 farms in 16 states were determined by pulsed-field gel electrophoresis (PFGE). Digestion of genomic DNAs with the(More)
An international multicenter typing study of Listeria monocytogenes was initiated by the World Health Organization (Food Safety Unit, Geneva) in order to evaluate the usefulness of various phenotypic(More)
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