Serotype and Virulence of Edwardsiella tarda Isolated from Eel and Their Environment
1983 Volume 18 Issue 2 Pages 85-89
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1983 Volume 18 Issue 2 Pages 85-89
Four hundred and forty five isolates of Edwardsiella tarda were collected on field surveys in eel culture ponds in Shizuoka Prefecture in 1980 and 1981. Two hundred and seventy isolates (61%) were classified, according to O-agglutination test, into four serotypes (A, B, C and D).
There were no great differences in the composition of the serotypes among the following three kinds of samples; rectum contents of eel, eel pond water and pond sediments (A: 13-17%, B: 22 35%, C: 4-13%, D: 2-4%). However, serotype A was predominant in kidney samples (A: 72%, B: 0%, C: 3%, D: 13%).
By experimental infection to eel, tilapia and loach, serotype A of E. tarda proved highly virulent to the fishes, especially to eel, in comparison with the other serotypes tested.
