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Journal of Veterinary Diagnostic Investigation Vol. 21 Issue 5, 698-701
Copyright © 2009 by the American Association of Veterinary Laboratory Diagnosticians
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Brief Research Reports

Antimicrobial resistance of streptococci isolated from mastitic bovine milk samples in Korea

Hyang-mi Nam1, Suk-Kyung Lim, Hyun-Mi Kang, Jae-Myoung Kim, Jin-San Moon, Keum-Chan Jang, Yi-Seok Joo, Mun-il Kang and Suk-Chan Jung

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

The aim of this study was to determine the antimicrobial resistance of streptococci isolated from mastitic bovine milk samples. A total of 178 isolates belonging to 6 different Streptococcus species were examined: S. uberis (n = 99), S. bovis (n = 30), S. oralis (n = 24), S. salivarius (n = 13), S. intermedius (n = 7), and S. agalactiae (n = 5). Only 8.9% (16/178) of the isolates were susceptible to all antimicrobial agents tested in this study, and S. agalactiae and S. intermedius isolates were all resistant to at least 1 antimicrobial agent tested. Overall, the most frequently observed resistance was to tetracycline (61.2%), followed by lincomycin (43.2%), gentamycin (35.3%), oxacillin (34.3%), and erythromycin (28.6%). Cephalothin and penicillin were the only antimicrobial agents to which most of the streptococci (≥92%) were susceptible. Wide differences in the prevalence of resistance are apparent among the individual species: S. salivarius displayed exceptionally high resistance to cephalothin (23.0%) and oxacillin (76.9%) and S. agalactiae (20%) and S. intermedius (14.2%) to penicillin. Streptococcus salivarius and S. agalactiae were all susceptible to erythromycin, but others showed various rates of resistance ranging from 12.5% to 42.8%. Resistance to 3 or more of 7 antimicrobial agents was observed in all species (37.6%, 67/178).

Key Words: Antimicrobial resistance • bovine • mastitis • Streptococcus






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