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Volume 20, Number 12—December 2014

Geographic Divergence of Bovine and Human Shiga Toxin–Producing Escherichia coli O157:H7 Genotypes, New Zealand1

Patricia JarosComments to Author , Adrian L. Cookson, Donald M. Campbell, Gail E. Duncan, Deborah Prattley, Philip E. Carter, Thomas E. Besser, Smriti Shringi, Steve Hathaway, Jonathan C. Marshall, and Nigel P. French
Author affiliations: Massey University, Palmerston North, New Zealand (P. Jaros, D. Prattley, J.C. Marshall, N.P. French); AgResearch Ltd, Palmerston North (A.L. Cookson); Ministry for Primary Industries, Wellington, New Zealand (D.M. Campbell, G.E. Duncan, S. Hathaway); Institute of Environmental Science and Research Ltd, Porirua, New Zealand (P. Carter); Washington State University, Pullman, Washington, USA (T.E. Besser, S. Shringi)

Main Article

Table 2

Frequency distribution of predominant SBI genotypes of Shiga toxin–producing Escherichia coli O157:H7 isolates obtained from humans, bovine fecal samples, and bovine meat samples, New Zealand, 2008–2011*

Isolate type, SBI type No. with SBI type/no. total (%)
p value†
North Island South Island
AY2a 175/278 (62.9) 35/85 (41.2) <0.001
WY12a 41/278 (14.7) 9/85 (10.6)
ASY2c/SY2c 49/278 (17.6) 35/85 (41.2)
13/278 (4.7)
6/85 (7.1)

Bovine fecal
AY2a 22/32 (68.8) 0/8 <0.001
WY12a 6/32 (18.8) 0/8
1/32 (3.1)
8/8 (100.0)

Bovine meat
AY2a-like 137/201 (68.2) 15/34 (44.1) <0.001
WY12a-like 49/201 (24.4) 6/34 (17.6)
ASY2c/SY2c-like 15/201 (7.5) 13/34 (38.2)

*SBI, Shiga toxin–encoding bacteriophage insertion.
†Values refer to differences between frequency distributions of SBI types and North and South Islands (χ2 and Fisher exact test).

Main Article

1Preliminary results from this study were presented at the New Zealand Veterinary Association Conference; June 16–20, 2014, Hamilton, New Zealand.

Page created: November 18, 2014
Page updated: November 18, 2014
Page reviewed: November 18, 2014
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