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ISSN : 2287-7991(Print)
ISSN : 2287-8009(Online)
Journal of the Preventive Veterinary Medicine Vol.43 No.1 pp.12-18

Antimicrobial susceptibility of major bacterial pathogens in the equine genital tract

Kyoung-Yong Han1,Hyoung-Seok Yang1,Wan-choul Kang1,Wongeun Son2†
1Jeju Self-Governing Provincial Veterinary Research Institute, Jeju 63344, Republic of Korea
2Department of Veterinary Diagnosis and Veterinary Medical Research Institute, College of Veterinary Medicine, Jeju National University,Jeju 63243, Republic of Korea
Corresponding Author. Wongeun Son, Tel: +82-64-754-3373, Fax: +82-64-756-3354


Equine reproductive failures for many different reasons are the main contributors to economic losses in the horse industry. This paper describes major bacterial agents isolated from thoroughbred mares that had reproductive failures in the previous year as well as the antimicrobial susceptibility of these bacterial isolates. A total of 146 vaginal and uterine swab samples were submitted to Jeju Self-Governing Veterinary Research Institute by equine veterinarians from 2011 to 2015. Streptococcus equi subspecies zooepidemicus were the most frequently encountered bacteria in 29 samples (48.3%). Other identified species included 21 samples (35%) with Escherichia coli, six samples (10%) with Klebsiella pneumoniae, and four samples (6.7%) with Pseudomonas aeruginosa. All Streptococcus equi subsp. zooepidemicus isolates were sensitive to amoxicillin-clavulanic acid, cefazolin, cefuroxime, and florfenicol, while all were resistant to tetracycline and kanamycin. All E. coli were sensitive to enrofloxacin, ciprofloxacin, and sulfamethoxazole-trimethoprim, and most were susceptible to cefazolin, amoxicillin-clavulanic acid, cefuroxime, florfenicol, and gentamicin. All K. pneumoniae isolates were sensitive to amoxicillin-clavulanic acid, cefazolin, cefuroxime, florfenicol, and ciprofloxacin, while all were resistant to sulfamethoxazole-trimethoprim. P. aeruginosa exhibited sensitivity to quinolones and aminoglycosides, particularly gentamicin, while all were resistant to cefazolin and cefuroxime.