Properties of Some Aeromonas salmonicida - Virulent Phages Isolated in Japan

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  • 本邦で分離されたAeromonas salmonicida―ヴィルレント・ファージの特性
  • ホンポウ デ ブンリサレタ Aeromonas salmonicida ブィル

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Virulent bacteriophages specific for Aeromonas salmonicida were isolsted from water samples, collected from fish farms, rivers, lakes and marshes in Japan. The isolated phages differed greatly in the fine structure of the virion, plaque morphology, spectrum of lytic action, stability and one-step growth characteristics. At the same time, They had identical serological properties. Based on the phage properties, they were classified in five groups, Group I phages consisted of an elongated hexagonal head and a tail of complex structure with a contractile sheath. The phages of groups II, IV and V had a head with a hexagonal outline and tail with a contractile sheath. Group III phages exhibited a hexagonal head with a unique short tail. In the five groups, The phages belonging to group III formed the largest clear plaque, were unstable to heating at 50°C for 30 min. and adding chloroform, and showed the shortest of latent period. They had a peculiar property in others of the groups. Phage typing with presentative phage of each group may provide a rapid and senstive means of differentiating A. salmonicida strains.

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