Comparison of types and antimicrobial susceptibility of Staphylococcus from conventional and organic dairies in west-central Minnesota, USA

Comparison of types and antimicrobial susceptibility of Staphylococcus from conventional and organic dairies in west-central Minnesota, USA

To assess whether conventional and organic dairy management practices are associated with differences in the susceptibility of Staphylococcus to antimicrobial agents. Staphylococcus was isolated from milk samples collected from conventional and organic dairies in west-central Minnesota. Isolates wer...

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Bibliographic Details
Published in:Journal of applied microbiology Vol. 104; no. 6; pp. 1726 - 1731
Main Authors: Bombyk, R.A.M, Bykowski, A.L, Draper, C.E, Savelkoul, E.J, Sullivan, L.R, Wyckoff, T.J.O
Format: Journal Article
Language:English
Published: Oxford, UK Oxford, UK : Blackwell Publishing Ltd 01-06-2008
Blackwell Publishing Ltd
Blackwell Science
Subjects:
Animal Husbandry - methods
Animals
Anti-Infective Agents - pharmacology
antimicrobial susceptibility
Bacteriological Techniques
Biological and medical sciences
Cattle
Cattle Diseases - microbiology
coagulase-negative Staphylococcus
Colony Count, Microbial - veterinary
dairies
dairy
Dairying
Female
Food, Organic
Fundamental and applied biological sciences. Psychology
Industrial Microbiology
Microbial Sensitivity Tests
Microbiology
Milk - microbiology
Minnesota
organic livestock
Staphylococcal Infections - veterinary
Staphylococcus
Staphylococcus - classification
Staphylococcus - drug effects
Staphylococcus - isolation & purification
Minnesota
organic livestock
Applied microbiology
antimicrobial susceptibility
Antimicrobial agent
Staphylococcus
Sensitivity resistance
coagulase-negative Staphylococcus
Bacteria
Micrococcales
Micrococcaceae
Livestock
dairy
Comparative study
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Summary:To assess whether conventional and organic dairy management practices are associated with differences in the susceptibility of Staphylococcus to antimicrobial agents. Staphylococcus was isolated from milk samples collected from conventional and organic dairies in west-central Minnesota. Isolates were categorized as (1) coagulase-positive, (2) novobiocin-sensitive coagulase-negative or (3) novobiocin-resistant coagulase-negative. Novobiocin-resistant coagulase-negative Staphylococcus (CNS) was more common on conventional farms and novobiocin-sensitive CNS predominated the isolates from organic farms. Overall, a larger proportion of isolates from organic rather than conventional farms were susceptible to erythromycin, pirlimycin and tetracycline. However, for pirlimycin and tetracycline, different patterns of susceptibility were observed among Staphylococcus categories. In this study, organic dairy management was associated with more overall antimicrobial susceptibility among Staphylococcus than was conventional management. However, different patterns of susceptibility among Staphylococcus categories suggest that multiple management practices, including some unrelated to antimicrobial use, may contribute to the observed differences in susceptibility. This study adds to our understanding of the implications of dairy management choices.
Bibliography:http://dx.doi.org/10.1111/j.1365-2672.2007.03681.x
These authors contributed equally to this work.
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ISSN:1364-5072
1365-2672
DOI:10.1111/j.1365-2672.2007.03681.x