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J. Dairy Sci. 2009. 92:2020-2026. doi:10.3168/jds.2008-1739
© 2009 American Dairy Science Association ®
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Prevalence and antimicrobial susceptibility of gram-negative bacteria isolated from bovine mastitis between 2003 and 2008 in Korea

H. M. Nam1, S. K. Lim, H. M. Kang, J. M. Kim, J. S. Moon, K. C. Jang, J. M. Kim, Y. S. Joo and S. C. Jung

National Veterinary Research and Quarantine Service, 480, Anyang City, Gyeonggi-do, 430-824, Republic of Korea

1 Corresponding author: namhm{at}nvrqs.go.kr

The objective of this study was to assess trends in the prevalence and distribution of gram-negative bacteria isolated from bovine mastitis and their antimicrobial susceptibilities during a 6-yr period between 2003 and 2008 in Korea. Escherichia coli, Pseudomonas fluorescens, Klebsiella pneumoniae, Enterobacter cloacae, Acinetobacter lwoffi/junii, Pseudomonas aeruginosa, and Serratia marcescens were the most commonly observed pathogens during this period. Generally, gram-negative bacteria showed low susceptibilities to most of the antimicrobials tested in this study, except amikacin and gentamicin. Although these 2 aminoglycosides were broadly active against gram-negative bacteria, less than half of those bacteria showed susceptibilities to streptomycin. The β-lactams, except piperacillin, had the lowest activity among antimicrobials tested in this study. Susceptibilities to chloramphenicol and trimethoprim were fairy high in all genera of gram-negative bacteria, except Acinetobacter spp. and Pseudomonas spp., whereas relatively high resistance to tetracycline was observed uniformly among gram-negative bacteria. There was no significant change in the prevalence of bacterial and the proportion of antimicrobial resistance among gram-negative bacteria isolates during a 6-yr period.

Key Words: mastitis • gram-negative bacteria • prevalence • antimicrobial resistance






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