The Effect of Antibiotics in Combination with EDTA-Tris on the Methicillin-Resistant Major Pathogens of Bovine Mastitis in Milk

유즙내에서 메티실린 내성을 지닌 젖소 유방염 주요 원인균에 대한 항생제와 EDTA-Tris의 병합의 효과

  • Yoo, Jong-Hyun (BK21 Program of Integrative Network Systems for Veterinarians in Basic Science, Industrial Animals and Preventive Medicines, Konkuk University) ;
  • Park, Hee-Myung (Department of Veterinary Internal Medicine, College of Veterinary Medicine, Konkuk University)
  • 유종현 (건국대학교 수의과대학 BK21 수의기초.산업동물.예방의학 통합네트워크 연구인력양성 사업단) ;
  • 박희명 (건국대학교 수의과대학 수의내과학교실)
  • Published : 2008.10.31

Abstract

The combined effects of EDTA-Tris and eighteen antimicrobial agents have been evaluated in eight clinically isolated methicillin-resistant bacteria (Staphylococcus aureus, Escherichia coli, Streptococcus uberis and Streptococcus agalactiae) from bovine mastitis. The antimicrobial activity was evaluated by measuring the minimal bactericidal concentration (MBC) for the antibiotics alone or in combination with EDTA-Tris in Mueller-Hilton broth and milk. Combined use of EDTA-Tris and antibiotics potentiated or antagonized activity of antibiotics against mastitic pathogens. Milk increased the antibiotic potency of erythromycin and spiramycin on S. aureus. Culture in milk changed patterns of EDTA-Tris combinational effects compared with that in standard Mueller-Hilton broth. Combined with EDTA-Tris in milk, synergic effects were observed in colistin, dihydrostreptomycin, kanamycin, erythromycin, gentamycin, oxytetracycline, streptomycin to E. coli, Str. uberis, and Str. agalactiae. However, significant antagonistic effects of milk on antibiotic susceptibility in combination with EDTA-Tris were noted in neomycin, streptomycin, penicillin, roxithromycin, and amoxicillin. This study indicates that combination therapy of EDTA-Tris with antibiotics in bovine mastitis should be used with caution because of the possible antagonistic effects of antibiotic combination with EDTA-Tris on mastitic pathogens. In addition, antibiotic susceptibility test in combination with EDTA-Tris in milk culture condition can be benefit in search of effective treatment regimen for some antibiotic-resistant bacteria of mastitis.

Keywords

References

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