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Characterization and Infectivity of Four Bacterial Strains Isolated from Brown Ring Disease-Affected Clams
1Instituto de Investigaciones Marinas, CSIC, Eduardo Cabello, Vigo, 6. 36208, Spain
Journal of Invertebrate Pathology
|February 3, 1998
Summary
Bacterial strains causing Brown Ring Disease (BRD) in clams were identified. Pathogenicity varied, with some strains showing high virulence and resistance to clam immune responses.
Area of Science:
- Bacteriology
- Aquaculture
- Marine Biology
Background:
- Brown Ring Disease (BRD) affects commercially important clam species.
- Bacterial pathogens are implicated in BRD outbreaks.
Purpose of the Study:
- Characterize bacterial strains isolated from diseased clams.
- Determine pathogenicity and immune resistance of these strains.
Main Methods:
- Biochemical and serological characterization of bacterial isolates.
- Pathogenicity assays in Ruditapes decussatus and R. philippinarum.
- Assessment of resistance to clam hemolymph.
Main Results:
- Four Vibrio strains were isolated from symptomatic clams.
- Two strains showed characteristics similar to Vibrio tapetis.
- Pathogenicity varied, with mortality rates from 6-80% and high BRD prevalence.
- Bacterial strains generally exhibited resistance to clam hemolymph.
Conclusions:
- The study identified potential bacterial agents of BRD in clams.
- Strain virulence and host specificity are key factors in disease development.
- Bacterial resistance to hemolymph suggests a role in pathogenesis.