P Pohl, G Daube, J Mainil, P Lintermans, A Kaeckenbeeck, E Oswald
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[Virulence factors and phenotypes of sixty-one strains of Escherichia coli of bovine origin, producing cytotoxic necrotising toxin type 1 (CNF 1)].
Virulence factors and phenotypes of 61 strains CNF1+ were investigated. Eighty-nine percent of the strains produced an aerobactin and were resistant to the bactericidal activity of sheep serum, both of which are properties of septicemic strains of E coli. None of the strains reacted either with DNA probes corresponding to the enterotoxins STaP, STb, LT-I and LT-IIa, or to the verotoxins VT-I and VT-II. None produced the adhesins K99, Att25 (FY or F17) and Att111. The great majority (93.4%) of the CNF1+E coli possessed both properties. These properties allow CNF1+ to be distinguished from CNF-E coli.
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