Journal of Microbiology

The Microbiological Society of Korea (한국미생물학회)
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Characterization of Aeromonas hydrophila Isolated from Rainbow Trouts in Korea

  • Lee, Soondeuk (Department of Biology, Seoul Women′s University) ;
  • Kim, Sookyung (Department of Biology, Seoul Women′s University) ;
  • Yoojung Oh (Department of Biology, Seoul Women′s University) ;
  • Lee, Yeonhee (Department of Biology, Seoul Women′s University)
  • Published : 2000.03.01
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Abstract

Eight strains of Aeromonas hydrophila isolated from diseased trout in Korea were characterized and compared with an American type strain by various methods including biochemical and physiological tests, PCR, randomly amplified polymorphic DNA (RAPD), plasmid profiling, and gel electrophoresis of total, membrane, and extracellular proteins. Virulence factors such as surface array proteins, cytotoxin, hemolysin, haemagglutinin, and protease were also investigated. The Korean strains showed heterogeneity in Iysine decarboxylase production, utilization of various carbon sources, and production of acetoin. Five strains had the same profiles of total and membrane proteins. Six strains haemagglutinated with trout red blood cells (RBCs) which was inhibited by fucose, galactose, and mannose, except for No. 1 where haemagglutination was inhibited by only galactose and mannose, but not by fucose. Four isolates haemagglutinated with human RBCs which was inhibited by fucose and mannose yet not by galactose. The type strain haemagglutinated only with trout RBCs which was inhibited by fucose, galactose, and mannose. Every isolate secreted protease, hemolysin, cytotoxin, and siderophore, but no enterotoxin. Results showed that the Korean isolates, except for No.7, had very different biochemical and molecular characteristics from those of the American type strain.

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