Serogroups and antimicrobial susceptibility among Escherichia coli isolated from farmed mink ( Mustela vison Schreiber) in Denmark

Escherichia coli is commonly found in outbreaks of diarrhoea in mink during the production season although its role as a primary causal organism remains unclear. The present study was undertaken to determine the serogroups and antimicrobial susceptibility of E. coli isolates from healthy and diarrho...

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Bibliographic Details
Published in:Veterinary microbiology 2001-03, Vol.79 (2), p.143-153
Main Authors: Vulfson, L, Pedersen, K, Chriél, M, Frydendahl, K, Holmen Andersen, T, Madsen, M, Dietz, H.H
Format: Article
Language:English
Subjects:
Animals
Anti-Bacterial Agents - pharmacology
Antimicrobial sensitivity
Bacteriology
Biological and medical sciences
Denmark
Diarrhea - microbiology
Diarrhea - veterinary
Disease Outbreaks - veterinary
enrofloxacin
Epidemiology
Escherichia coli
Escherichia coli - classification
Escherichia coli - drug effects
Escherichia coli Infections - epidemiology
Escherichia coli Infections - microbiology
Escherichia coli Infections - veterinary
Female
Fundamental and applied biological sciences. Psychology
Male
Microbial Sensitivity Tests - veterinary
Microbiology
Mink
Mink - microbiology
Mustela vison
Pathogenicity, virulence, toxins, bacteriocins, pyrogens, host-bacteria relations, miscellaneous strains
Serotyping - veterinary
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Summary:Escherichia coli is commonly found in outbreaks of diarrhoea in mink during the production season although its role as a primary causal organism remains unclear. The present study was undertaken to determine the serogroups and antimicrobial susceptibility of E. coli isolates from healthy and diarrhoeic mink. Rectal swabs were taken from healthy and diseased animals, on six different farms, once at the onset of disease and again approximately 2 weeks later. The swabs were subjected to bacteriological investigation; a total of 210 E. coli were isolated, 98 from healthy animals and 112 from diseased. All isolates were serotyped and MICs were determined for nine antimicrobial compounds. Non-haemolytic isolates numbered 147, whereas 63 were haemolytic. Both haemolytic and non-haemolytic isolates were isolated from both healthy and diseased animals. A wide range of serogroups was detected, the most frequent being O2 (11.0%), O78 (11.0%), O153 (7.1%), O25 (5.7%), O6 (4.8%), and O15 (4.8%), but diarrhoea was not associated with specific serogroups. All isolates were sensitive to enrofloxacin, neomycin, gentamicin and colistin. In contrast, considerable variations in susceptibility were found among the six mink farms, for tetracycline (0–46.4%, average 21.9), ampicillin (2.9–50.0%, average 23.3), spectinomycin (8.0–35.7%, average 21.9), sulfamethoxazole (8.6–57.7%, average 30.0) and trimethoprim (0–35.7%, average 9.5). Resistance to tetracycline was statistically more prevalent among haemolytic than among non-haemolytic strains. In conclusion, serogrouping and haemolysin testing failed to identify any association with diarrhoeal disease and antimicrobial resistance was highly variable between different mink farms.
ISSN:0378-1135
1873-2542
DOI:10.1016/S0378-1135(00)00343-6