Academic article

Escherichia coli O157:H7 in Faeces from Cattle, Sheep and Pigs in the Southwest Part of Norway during 1998 and 1999

Johnsen, Gro; Wasteson, Yngvild; Heir, Even; Berget, Odd Ivar; Herikstad, Hallgeir

Publication details

Journal: International journal of food microbiology, vol. 65, p. 193–200, 2001

Publisher: Elsevier

Issue: 3

International Standard Numbers:
Printed: 0168-1605
Electronic: 1879-3460

Open Access: none

During a 2-year period from January 1998 to December 1999, intestinal content from 1541 cattle, 665 sheep and 1976
pigs were analysed for Escherichia coli O157:H7 using the immunomagnetic separation procedure. The animals originated
from 848, 605 and 832 herds from the southwest part of Norway, respectively. E. coli O157:H7 was present in three samples from cattle from different herds, giving a herd prevalence of 0.35% and an animal prevalence of 0.19%. From pigs, E. coli O157:H7 was isolated from two pigs from different herds, giving a herd prevalence of 0.24% and an animal prevalence of 0.1%. A follow-up study revealed another positive testing pig from one of these herds. E. coli O157:H7 was not found from any of the 665 investigated sheep. By PCR analysis, all six E. coli O157:H7 isolates were shown to contain the genes encoding Shiga toxin 2 (stx2), the intimin protein (eae) and the H7 flagellum (fliC-H7). One of the cattle isolates also harboured the Shiga toxin 1 encoding (stx1) gene. The six isolates were differentiated into three pulse-field gel electrophoresis profiles. The results indicate that the occurrence of E. coli O157:H7 in cattle, sheep and pigs in the southwest part of Norway is low compared to other European countries.