Original Scientific Article
Investigations on prevalence and antimicrobial resistance of enterohaemorrhagic Escherichia coli (EHEC) among dairy farms in the north part of the Republic of Bulgaria
Valentina Urumova
*
,
Mihni Lyutzkanov
,
Vladimir Petrov
Received: 10 May 2014
Received in revised form: 29 September 2014
Accepted: 20 October 2014
Available Online First: 07 November 2014
Published on: 15 March 2015
Correspondence: Valentina Urumova, valentina_62@ abv.bg
Abstract
Over a 2-year period, from January 2011 to May 2013, a total of 1094 faecal swab samples were collected from cattle at different age at 4 farms in North Bulgaria: Okorsh, Slavyanovo (Popovo municipality), Dobri dol and Trem. Out of them, 36 coli strains (3.3%) positive in the E. coli O:157 antiserum agglutination test and identified by the BBL CRYSTAL identification system as belonging to the E. coli O:157 serotype were isolated. The distribution of isolates was as followed: 5 (0.5%) E. coli O:157 strains at the Okorsh dairy cattle farm, 7 (0.6%) E. coli isolates at the Slavyanovo dairy farm, 16 (1.5%) isolates at the Dobri dol farm and 8 (0.7%) isolates at the Trem farm. Colibacteria exhibited 100% sensitivity to oxyimino-cephalosporins, gentamicin and enrofloxacin, and were resistant to ampicillin (19.4%) and tetracycline (41.6%). From the 15 strains resistant to tetracycline, 11 were isolated from the cows at Dobri dol, while the other 4 originated from the other three farms. The 7 ampicillin-resistant E. coli isolates were detected only at the Dobri dol cattle farm.
Keywords: EHEC, cattle, antibiotic resistance
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Copyright
© 2015 Urumova V. This is an open-access article published under the terms of the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Conflict of Interest Statement
The authors declared that they have no potential conflict of interest with respect to the authorship and/or publication of this article.
Citation Information
Macedonian Veterinary Review. Volume 38, Issue 1, Pages 21-29, p-ISSN 1409-7621, e-ISSN 1857-7415, DOI: 10.14432/j.macvetrev.2014.11.027, 2015
10.14432/j.macvetrev.2014.11.027
