Edwardsiella tarda의 특이 Bacteriophage와 Bacillus subtilis KM-1혼합액이 Edwardsiella tarda 에 미치는 항균효과
Mixture of Edwardsiella tarda specific Bacteriophage and Bacillus subtilis KM-1enhanced bactericidal activity against Edwardsiella tarda
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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 2×10⁵ CFU/㎖의 농도로 존재할 때 배양 36시간째 2×10⁵ PFU/㎖로 나타났다. B. subtilis의 경우 2×10⁵ PFU/㎖의 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 양식 어류의 E. tarda 감염성 질병 치료를 위한 항생제 대체제로서의 사료첨가제 개발 가능성을 제시하고 있다.
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 2×10⁵ PFU/㎖ with 1×10⁷ CFU/㎖ 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 (2×10⁵ PFU/㎖). 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.
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