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Spread of Staphylococcus aureus resistant to penicillin and tetracycline within and between dairy herds

Published online by Cambridge University Press:  02 September 2002

S. WAAGE ,
J. BJORLAND ,
D. A. CAUGANT ,
H. OPPEGAARD ,
T. TOLLERSRUD ,
T. MØRK  and
F. M. AARESTRUP
S. WAAGE
Affiliation:
Section of Cattle Health, National Veterinary Institute, N-0033 Oslo, Norway Department of Reproduction and Forensic Medicine, Norwegian School of Veterinary Science, N-0033 Oslo, Norway
J. BJORLAND
Affiliation:
Department of Reproduction and Forensic Medicine, Norwegian School of Veterinary Science, N-0033 Oslo, Norway
D. A. CAUGANT
Affiliation:
Department of Bacteriology, National Institute of Public Health, N-0403 Oslo, Norway
H. OPPEGAARD
Affiliation:
Department of Pharmacology, Microbiology and Food Hygiene, Norwegian School of Veterinary Science, N-0033 Oslo, Norway
T. TOLLERSRUD
Affiliation:
Section of immunoprophylaxis, National Veterinary Institute, N-0033 Oslo, Norway
T. MØRK
Affiliation:
Section of Cattle Health, National Veterinary Institute, N-0033 Oslo, Norway
F. M. AARESTRUP
Affiliation:
Danish Veterinary Laboratory, DK-1790, Copenhagen V, Denmark
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Abstract

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One hundred and seven bovine isolates of penicillin and tetracycline resistant Staphylococcus aureus, recovered from 25 different dairy herds in various parts of Norway, were characterized using antimicrobial susceptibility testing, multilocus enzyme electrophoresis, ribotyping, plasmid analysis and serotyping of capsular polysaccharide. Forty-one isolates from one particular herd, 37 isolates from 5 herds that used a common pasture and milking parlour in summer and 21 isolates from 12 herds in 8 different counties belonged to the same strain. The remaining 8 isolates, which originated from herds in 5 different counties, were assigned to 6 different strains. Seven out of these 8 isolates had the same plasmid restriction profile. In conclusion, penicillin and tetracycline resistant S. aureus occurring in dairy herds in Norway mainly seems to represent one particular strain that has achieved widespread distribution or belong to one of several different strains carrying identical plasmids.

Type
Research Article
Information
Epidemiology & Infection , Volume 129 , Issue 1 , August 2002 , pp. 193 - 202
Copyright
© 2002 Cambridge University Press