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Effect of on-farm interventions in the aftermath of an outbreak of hypervirulent verocytotoxin-producing Escherichia coli O157:H7 in Sweden
  1. Lena-Mari Tamminen1,
  2. Helena Fransson1,
  3. Madeleine Tråvén1,
  4. Anna Aspán2,
  5. Stefan Alenius1,
  6. Ulf Emanuelson1,
  7. Ilmars Dreimanis3,
  8. Mats Törnquist4 and
  9. Erik Eriksson2
  1. 1Section of Ruminant Medicine and Epidemiology, Department of Clinical Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden
  2. 2Department of Microbiology, National Veterinary Institute, Uppsala, Sweden
  3. 3Nygård Kattarp, Laholm, Sweden
  4. 4Swedish Animal Health Service, Staffanstorp, Sweden
  1. E-mail for correspondence; lena.mari.tamminen{at}slu.se

Abstract

In 2007, human infections with a hypervirulent strain of verocytotoxin-producing Escherichia coli O157:H7 increased in Sweden and especially in the Halland County. A connection between the cases and a local beef cattle farm with an on-farm abattoir and meat processing plant was established. In this observational study the control measures implemented on the infected farm and the dynamics of infection in the herd are described. In May 2008, when measures were initiated and animals put to pasture, the prevalence of positive individuals was 40 per cent and 18 carcasses out of 24 slaughtered animals were contaminated. During summer the monthly prevalence of positive carcasses varied between 8 and 41 per cent and at turning-in 22 out of 258 individually sampled animals were shedding the pathogen. After January 2009 no positive carcasses were found at slaughter and follow-up samplings of environment and individuals remained negative until the study period ended in May 2010. The results indicate that on-farm measures have potential to reduce the prevalence of the pathogen in a long-term perspective. However, as self-clearance cannot be excluded the effectiveness of the suggested measures needs to be confirmed.

  • Verotoxin
  • Shiga toxin
  • Cattle
  • Clearance
  • On-farm Measures
  • Eradication

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Footnotes

  • L-MT and HF contributed equally.

  • Funding This study was funded by the Stiftelsen Lantbruksforskning (grant number V0930039).

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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