Antimicrobial susceptibility and genetic characteristics of Streptococcus uberis isolated from bovine mastitis milk
2007
Lee, G. (Konkuk University, Seoul, Republic of Korea) | Kang, H.M. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea) | Chung, C.I. (Konkuk University, Seoul, Republic of Korea) | Moon, J.S. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea), E-mail: moonjs@nvrqs.go.kr
Streptococcus spp. comprising Streptococcus (S.) uberis and S. dysgalactiae strains is major cause of bovine mastitis from particularly well-managed or low somatic cell count herds that have successfully controlled contagious pathogens. In this study, antimicrobial susceptibility and genetic characteristics of S. uberis isolated from clinical or subclinical mastitis milk at 2003 were investigated. Eighty seven isolates of Streptococcus spp. were identified by the conventional biochemical methods. The antimicrobial susceptibility by disk diffusion method was determined for 46 S. uberis, 11 S. bovis, 10 S. oralis, 6 S. uberis and 14 other Streptococcus spp., Overall, the tested strains were susceptible to tetracycline (11.5%), amikacin (14.9%), streptomycin (16.1%), neomycin (26.4%), kanamycin (35.6%), gentamicin (65.2%), oxacillin (70.1%), ampicillin (75.9%), chloramphenicol (78.2%), and cephalothin (97.7%).
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