Shiga-toxin E. coli in New Zealand cattle

Nationwide prevalence and risk factors for fecal carriage of Escherichia coli O157 and O26 in cattle were assessed in a 2-year cross-sectional study at four large slaughter plants in New Zealand.

cow-meatRecto-anal mucosal swab samples from a total of 695 young (aged 4–7 days) calves and 895 adult cattle were collected post-slaughter and screened with real-time polymerase chain reaction (PCR) for the presence of E. coli O157 and O26 [Shiga toxin-producing E. coli (STEC) and non-STEC]. Co-infection with either serogroup of E. coli (O157 or O26) was identified as a risk factor in both calves and adult cattle for being tested real-time PCR-positive for E. coli O157 or O26.

As confirmed by culture isolation and molecular analysis, the overall prevalence of STEC (STEC O157 and STEC O26 combined) was significantly higher in calves [6·0% (42/695), 95% confidence interval (CI) 4·4–8·1] than in adult cattle [1·8% (16/895), 95% CI 1·1–3·0] (P < 0·001).

This study is the first of its kind in New Zealand to assess the relative importance of cattle as a reservoir of STEC O157 and O26 at a national level. Epidemiological data collected will be used in the development of a risk management strategy for STEC in New Zealand.

Nationwide prevalence and risk factors for faecal carriage of Escherichia coli O157 and O26 in very young calves and adult cattle at slaughter in New Zealand

Jarosa1 c1, A. L. Cooksona2, A. Reynoldsa1, D. J. Prattleya1, D. M. Campbella3, S. Hathawaya3 and N. P. Frencha1

a1 mEpiLab, Hopkirk Research Institute, Massey University, Palmerston North, New Zealand

a2 AgResearch Ltd, Hopkirk Research Institute, Palmerston North, New Zealand

a3 Ministry for Primary Industries, Wellington, New Zealand

c1 Author for correspondence: Dr P. Jaros, mEpiLab, Hopkirk Research Institute, IVABS, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand.

Epidemiology and Infection, Volume 144, Issue 8, June 2016, Pages 1736-1747, DOI:

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A former professor of food safety and the publisher of, Powell is passionate about food, has five daughters, and is an OK goaltender in pickup hockey. Download Doug’s CV here. Dr. Douglas Powell editor, retired professor, food safety 3/289 Annerley Rd Annerley, Queensland 4103 61478222221 I am based in Brisbane, Australia, 15 hours ahead of Eastern Standard Time