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The usefulness of commercially available DNA probe kits for the detection of Escherichia coli and Salmonella spp. after only 6 h of incubation, was determined. It was established that the commercially available probe kits used could detect E. coli at initial levels of approximately 4.5 x 10(2) colony-forming units (cfu) per ml after only 6 h of incubation in nutrient broth (NB). Initial bacterial levels as low as 4.5 x 10(1) cfu/ml could be detected when the NB was incubated for 18 h.pmid:8539032 fatcat:l3wj5oqmi5boncdlhswv7o27cq