[Biological characteristics and histopathological observation of XXXX from diseased fish].

@entity12671 @entity6941 @entity114 @entity1066 @entity409 @entity281 @entity2755
OBJECTIVE: @entity1066 is one of the most serious diseases and a common problem in various stages marine culture including @entity6941 culture of southern China. The isolation and identification of pathogenic bacteria from @entity6941 will be useful for monitoring of drug resistance and controlling the outbreak and spread of @entity1066 in @entity6941 . The purpose of this study was to characterize the pathogen of @entity6941 . METHODS: The pathogenic bacteria separated from the liver and kidney of diseased fish were identified through pure culture, artificial @entity281 , automatic tests in bacteriology automatic identification, drug sensitive tests, morphometry, and physiological and biochemical determination. RESULTS: The strains were characterized and identified as @entity12671 . Two strain were selected for virulence tests and all the moribund/dead fish exhibited @entity1066 as that observed in natural outbreak. Drug sensitive tests show that @entity12671 was highly resistant to 3 agents including @entity114 , whereas sensitive to 5 agents including @entity2755 . Histopathological changes were mainly shown as @entity409 as a result of inflammatory cell infiltration in the diseased tissue. CONCLUSION: The biochemical, physiological tests confirm that @entity12671 is the pathogen causing @entity6941 vibriosis. The multi-drug resistance among @entity12671 suggests strengthened monitoring of outbreaks of @entity12671 caused disease in @entity6941 culture.
