Development of a multiplex PCR assay for the identification of pathogenic genes of Escherichia coli in milk and milk products.
A multiplex PCR for the simultaneous detection of some pathogenic genes of enteropathogenic, enterotoxigenic and verocytotoxin-producing Escherichia coli was developed. In this study primers found in literature as well as primers to the purpose designed were used. In this way, it was possible to generate specific fragments of 96, 170, 229, 285, 348, 414 and 510 bp for Hlya, St, EaeA, Lt, Vt1, UidA and Vt2 genes, respectively. When applied to bacterial strains experimentally inoculated in milk and milk products, the proposed PCR showed a detection limit of 5 x 10(4)CFU/ml for Hyla, St, Eaea, Vt1 primers, while for Lt and Vt2 primers the limit resulted of 10(6)CFU/ml.
Dipartimento di Patologia Animale, Università degli Studi di Torino, Via Leonardo da Vinci 44, 10095 Grugliasco Torino, Italy. mariateresa.bottero@unito.it
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Soglia
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Decastelli
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D000818:Animals; D001483:Base Sequence; D004269:DNA, Bacterial / Q000235:genetics* / Q000302:isolation & purification; D004926:Escherichia coli / Q000235:genetics*; D005798:Genes, Bacterial / Q000235:genetics*; D008892:Milk / Q000382:microbiology*; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction
D004269:DNA, Bacterial