Shiga Toxin Genes from Escherichia coli strains isolated from mastitic milk

Ray T. Cursons; J. Williamson; A. Bean

Shiga Toxin Genes from Escherichia coli strains isolated from mastitic milk

In: Mastitis in dairy production

Authors:

Ray T. Cursons

Ray T. Cursons Department of Biological Sciences, University of Waikato and Dexcel Lye Farm, Hamilton, New Zealand.

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J. Williamson

J. Williamson Department of Biological Sciences, University of Waikato and Dexcel Lye Farm, Hamilton, New Zealand.

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A. Bean

A. Bean Department of Biological Sciences, University of Waikato and Dexcel Lye Farm, Hamilton, New Zealand.

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Type:: Chapter

Pages:: 671–676

DOI:: https://doi.org/10.3920/9789086865505_102

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The bacterial species Escherichia coli includes a variety of different types that range from avirulent, commensal strains to virulent strains that cause a variety of severe infections. Over 700 antigenic types of E. coli have been recognized. In dairy cows E. coli are regarded as opportunistic and environmental pathogens that can cause mastitis.

Recent advances in molecular biology have facilitated the investigation of virulence factors in bacteria. We used DNA amplification to investigate the occurrence of 10 virulence factors in 80 isolates of E. coli from mastitis milk. The most common detected virulence gene was stx1 (31%), cnf2 (7.5%), stx2e (6.25%) and eaeA (4%). The possession of such virulence genes by bacteria had no discernable influence on the severity of both the localized and systemic symptoms of infected cows. However the possession of toxin genes in mastitis isolates of E. coli is problematical, particularly for both the public health and animal husbandry. Infection of man by shiga toxin E. coli (STEC) can range from mild diarrhoea to severe disease such as haemorrhagic colitis and the haemolytic uraemic syndrome. Furthermore the practice of feeding mastitis milk to calves should be discouraged both from an animal health perspective and as a preventative measure to reduce colonization of cattle by these strains and ultimately carriage rates. Over 200 serotypes of E. coli can produce shiga toxins and rates of colonization of STEC of any serotype in cattle herds can range from 10-25%.

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Mastitis in dairy production

Current knowledge and future solutions

E-Book ISBN:: 9789086865505

Publisher:: Wageningen Academic

Print Publication Date:: 24 Oct 2005

Subjects
- Life Sciences

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Shiga Toxin Genes from Escherichia coli strains isolated from mastitic milk

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Mastitis in dairy production

Current knowledge and future solutions

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