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Mixture of Edwardsiella tarda specific Bacteriophage and Bacillus subtilis KM-1enhanced bactericidal activity against Edwardsiella tarda

Edwardsiella tarda의 특이 Bacteriophage와 Bacillus subtilis KM-1혼합액이 Edwardsiella tarda 에 미치는 항균효과

  • Baek, Min Suk (Department of Aquatic Life Medicine, Kunsan National University) ;
  • Hwang, Yo Sep (Department of Aquatic Life Medicine, Kunsan National University) ;
  • Choi, Sanghoon (Department of Aquatic Life Medicine, Kunsan National University)
  • 백민석 (군산대학교 해양과학대학 수산생명의학과) ;
  • 황요셉 (군산대학교 해양과학대학 수산생명의학과) ;
  • 최상훈 (군산대학교 해양과학대학 수산생명의학과)
  • Received : 2013.10.10
  • Accepted : 2013.11.19
  • Published : 2013.12.31

Abstract

The present study was performed to investigate an antibacterial activity of specific bacteriophage (phage) and Bacillus subtilis KM-1 (B. subtilis) mixture against Edwardsiella tarda (E. tarda). An appropriate number of phage showing the most effective antibacterial activity was $2{\times}10^5$ PFU/ml with $1{\times}10^7$ CFU/ml of B. subtilis 36 h post incubation. On the other hand, B. subtilis showed a dose dependant manner in inducing antibacterial activity in the presence of phage ($2{\times}10^5$ PFU/ml). The phage and B. subtilis mixture showed higher antibacterial activity against E. tarda than phage or B. subtilis only. These results suggest that the phage and B. subtilis mixture could be utilized as an alternative to antibiotics in the control of fish diseases caused by E. tarda.

본 연구는 E. tarda에 대한 특이박테리오phage와 생균제의 일종인 B. subtilis KM-1의 혼합제가 E. tarda에 대한 항균활성에 미치는 효과를 알아보고자 수행되었다. 가장 효과적인 혼합제의 항균활성을 보인 phage의 적정 수는 B. subtilis 가 $2{\times}10^5$ CFU/ml의 농도로 존재할 때 배양 36시간째 $2{\times}10^5$ PFU/ml로 나타났다. B. subtilis의 경우 $2{\times}10^5$ PFU/ml의 phage가 존재할 때 첨가량에 비례하는 항균활성을 보여주었다. phage와 B. subtilis의 혼합투여는 phage나 B. subtilis 각각을 투여한 그룹보다 훨씬 높은 항균활성을 나타냈다. 본 연구의 결과는 수산양식에서 대두되고 있는 양식어류의 E. tarda 감염성 질병 치료를 위한 항생제 대체제로서의 사료첨가제 개발 가능성을 제시하고 있다.

Keywords

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