OCCURRENCE OF SHIGATOXINOGENIC ESCHERICHIA-COLI O157 IN NORWEGIAN CATTLE HERDS

To investigate if there is a reservoir of Escherichia coli O157 in Nor wegian cattle, faecal samples from 197 cattle herds were screened for E. coil O157 by the use of immunomagnetic separation (IMS) and PCR dur ing the 1995 grazing season. Six E. coli O157:H-isolates were detected in two herds, one isolate in one and five in the other. The isolates carried the stx(1), stx(2), and eae genes, and a 90 MDa virulence plas mid. They were toxinogenic in a Vero cell assay. From 57 other herds, 137 faecal samples were positive for stx(1) and/or stx(2) genes detect ed by PCR run directly on IMS-isolated material. Among these samples, stx(2) were the most widely distributed toxin encoding genes. No diffe rence was found among milking cows and heifers in the rate of stx(1) a nd/or stx(2) in positive samples.