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KMID : 0380420170410030124
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Journal of Prventive Veterinary Medicine
2017 Volume.41 No. 3 p.124 ~ p.128
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Synergistic antibacterial effects of a combination of cephalexin and gentamicin against Streptococci isolated from dairy cows with subclinical mastitis in Gyeongnam province
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Cha Chun-Nam
Park Eun-Kee
Yoo Chang-Yeul
Kim Suk
Lee Hu-Jang
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Abstract
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This study investigated the synergistic effects of a combination of cephalexin and gentamicin (CCG) against Streptococcus spp. isolated from bovine milk. Minimum inhibitory concentrations (MICs) and fractional inhibitory concentration (FIC) index were determined for 12 bacteria isolated from 12 bovine farms in Gyeongnam province. The MIC ranges of cephalexin, gentamicin and CCG were 0.25-0.5, 0.5-2.0 and 0.06-0.125 μg/mL, respectively. In addition, the FIC index range of CCG against the isolates was 0.32-0.34, showing a synergistic effect in the checkboard assay. In conclusion, CCG has a high antibacterial activity against Streptococcus isolates and may be utilized in the treatment of bovine streptococcal mastitis.
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KEYWORD
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Staphylococcus spp., bovine mastitis, cephalexin, gentamicin, FIC index
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