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

Journal of Applied Microbiology
R A M BombykT J O Wyckoff

Abstract

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 differenc...Continue Reading

References

May 1, 1991·Journal of Dairy Science·J S MatosB E Langlois
Oct 24, 2003·Current Opinion in Microbiology·Henrik C Wegener
Aug 4, 2004·Veterinary Microbiology·P J Rajala-SchultzB C Love
Feb 22, 2005·The Journal of Antimicrobial Chemotherapy·David VelascoGerman Bou
Mar 4, 2005·Journal of the American Veterinary Medical Association·Kenji SatoMahdi A Saeed

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Citations

Jan 24, 2017·EFSA Journal·UNKNOWN EMA Committee for Medicinal Products for Veterinary Use (CVMP) and EFSA Panel on Biological Hazards (BIOHAZ)Helen Jukes

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