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In this study, five abattoirs in Istanbul were visited between January 2000 and April 2001. During these visits, 330 cattle were selected by a systematic sampling method. Cattle were examined clinically
and breed, age, and sex were recorded. Rectal swabs were taken immediately after slaughter. Immunomagnetic separation was performed, and sorbitol-negative colonies were selected on sorbitol MacConkey agar
with cefixime and tellurite (CT-SMAC agar). These colonies were checked for 4-methylenebelliferyl-β-D-glucuronide, indol, rhamnose, and urease activity and motility. Serotypes of bacteria were determined
by using antisera specific for Escherichia coli O157 and H7. All cattle selected were clinically healthy. Of 88 sorbitol-negative colonies selected on CT-SMAC agar, isolates from only 14 (4.2%) cattle
reacted with anti-O157, and 13 of these isolates also reacted with anti-H7. E. coli O157:H7 was isolated from all breeds, but the numbers of isolates were largest for Holstein and Swiss Brown cows.
E. coli O157:H7 was most frequently isolated from 2-year-old cattle. Similarly, it was most frequently isolated from male cattle. E. coli O157:H7 was isolated from cattle slaughtered in four
of the five abattoirs studied.
Document Type: Research Article
The Scientific and Technical Research Council of Turkey (TUBITAK), Marmara Research Center, Food Science and Technological Research Institute, P.O. Box 21 41470,
Gebze, Kocaeli, Turkey 2:
University of Istanbul, Veterinary Faculty, Department of Microbiology, Avcilar, Istanbul, Turkey
Publication date: October 1, 2002
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