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Attaching and effacing Escherichia coli is a new causal agent of diarrhea in calves. Its major virulence factors are the intimin protein, encoded by the eaeA gene, and the Shiga-like toxins, encoded by slt genes. Because the sequences of these genes are available, we selected specific primers to amplify each virulence gene so as to develop a new identification test based on multiplex amplification of virulence-associated genes. Of 30 tested strains, 14 were eaeA+, 15 were eaeA+ slt-I+, 1 was eaeA+ slt-I+ slt-II+, and 1 was eaeA+ slt-II+. The method proved in our hands to be fast and specific and in perfect correlation with the hybridization method.

Typing of bovine attaching and effacing Escherichia coli by multiplex in vitro amplification of virulence-associated genes