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Journal of Veterinary Diagnostic Investigation Vol. 21 Issue 6, 858-862
Copyright © 2009 by the American Association of Veterinary Laboratory Diagnosticians
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Brief Research Reports

Species distribution and resistance patterns to growth-promoting antimicrobials of enterococci isolated from pigs and chickens in Korea

In Yeong Hwang, Hyun Ok Ku, Suk Kyung Lim, Choi Kyu Park, Gab Su Jung, Suk Chan Jung and Hyang Mi Nam1

Correspondence: 1Corresponding Author: Hyang Mi Nam, Bacteriology and Parasitology Division, National Veterinary Research and Quarantine Service, 480, Anyang 6-dong, Anyang, Gyeonggi-do, 430-824, Republic of Korea. namhm{at}nvrqs.go.kr

A total of 147 Enterococcus faecium and 165 Enterococcus faecalis isolates from fecal samples of chickens and pigs at slaughterhouses in Korea were tested for their resistance to 8 growth-promoting antimicrobials commonly used in animals and quinupristin and dalfopristin. Resistance to most antimicrobials was very common among both E. faecalis and E. faecium. In particular, E. faecalis showed almost no susceptibility to all the antimicrobials tested except penicillin and flavomycin, to which 1.4% and less than 24% showed resistance, respectively. Although the prevalence of resistance was lower than in E. faecalis, E. faecium showed relatively uniform resistance to all the agents tested. Among the antimicrobials tested, virginiamycin and penicillin were the most effective against E. faecium isolates: less than 31% and 41% showed resistance to those 2 antimicrobials, respectively. Penicillin was the only agent that showed relatively strong activity against both E. faecalis and E. faecium. Resistance observed in E. faecalis and E. faecium against most antimicrobials used for growth promotion was more prevalent in Korea than in European countries. The current study is the first report of resistance against feed additive antimicrobials in enterococcal isolates from livestock in Korea.

Key Words: Enterococci • growth-promoting antimicrobials • resistance






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