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This paper aims to compare difference with the in an ability of their resistance and survival against in a non-specific defence mechanism of the olive flounder, between the virulent and the avirulent E. tarda strains. The tested E. tarda strains, we divided into the virulent and the avirulent strain groups on the basis of a value of 50% lethal dose (LD50) for the olive flounder weighed 10.3 g in average. The strains of LD50 101.6~104.2 cfu/fish were grouped as virulent strains, such as KE-1, KE-3, KE-5 and FSW910410. The group of avirulent strains as LD50 exceeded 108.7 cfu/fish were included the strains, SU100 and AL92448. A test was conducted to understand the survival ability of each strain in the mucus of the skin and the intestine of olive flounders. The results showed KE-1, KE-3, KE-5 and FSW910410 were highly to survive between 6 hours and 24 hours in intestine. The survival ability in the bile of olive flounder the number of avirulent strains declined during incubation but the virulent strain showed the number of alive bacteria having sustained or increased. In the test for the survival of bacteria in fresh sera of olive flounder, the virulent strains also had tendency to multiply. Concerning the tested bacteria internalization into the head kidney macrophages and the intracellurar replication in the macrophages of olive flounder. The virulent strains exhibited strong internalization, followed high rate replication. According to the results, virulent strains of E. tarda revealed more ability to resist and survive in the face of humoral and cellular defence factors than avirulent strains.
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참고문헌 (24)
참고문헌 신청
Barnes, A.C. / 1999 / Superoxide dismutase and catalase in Photobacterium damselae subsp. piscicida and their roles in resistance to reactive oxygen species / Microbiol 145:483~494
Cole, A.M. / 1997 / Isolation and characterization of pleurocidin, an antimicrobial peptide in the skin secretions of winter flounder / J. Biol. Chem 272:12008~12013
Dalmo, R.A. / 1997 / Non-specific defence mechanisms in fish, with particular reference to the reticuloendothelial system (RES) / J. Fish Dis 20:241~273
Díaz-Rosales, P. / 2006 / Superoxide dismutase and catalase activities in Photobacterium damselae ssp. piscicida / J. Fish Dis 29:355~364
Ebran, N. / 2000 / Isolation and characterization of novel glycoproteins from fish epidermal mucus: correlation between pore-forming properties and their antibacterial activities / Biochimica et Biophysica Acta 1467:271~280
Cole, A.M. / 1997 / Isolation and characterization of pleurocidin, an antimicrobial peptide in the skin secretions of winter flounder / J. Biol. Chem 272:12008~12013
Dalmo, R.A. / 1997 / Non-specific defence mechanisms in fish, with particular reference to the reticuloendothelial system (RES) / J. Fish Dis 20:241~273
Díaz-Rosales, P. / 2006 / Superoxide dismutase and catalase activities in Photobacterium damselae ssp. piscicida / J. Fish Dis 29:355~364
Ebran, N. / 2000 / Isolation and characterization of novel glycoproteins from fish epidermal mucus: correlation between pore-forming properties and their antibacterial activities / Biochimica et Biophysica Acta 1467:271~280
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