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Immunoelectron microscopic demonstration that Renibacterium salmoninarum is encapsulated
D Dubreuil1, R Lallier, M Jacques
1Département de pathologie et microbiologie, Faculté de médecine vétérinaire, Université de Montréal, St-Hyacinthe, Québec, Canada.
FEMS Microbiology Letters
|January 1, 1990
Summary
Renibacterium salmoninarum, a fish pathogen, possesses a distinct capsular layer on its cell surface. This finding, observed via electron microscopy, confirms the bacterium is encapsulated.
Area of Science:
- Microbiology
- Bacteriology
- Fish Pathology
Background:
- Renibacterium salmoninarum is an important fish pathogen.
- Understanding bacterial cell surface structures is crucial for host-pathogen interactions.
Purpose of the Study:
- To investigate the cell surface characteristics of Renibacterium salmoninarum strains.
- To determine if R. salmoninarum possesses a capsule.
Main Methods:
- Transmission electron microscopy (TEM) was employed.
- Immuno-stabilization and ruthenium red staining were used to visualize cell surface structures.
Main Results:
- The cell surfaces of four R. salmoninarum strains, including the type strain, were examined.
- A capsular layer, ranging from 30 to 60 nm in thickness, was consistently observed on the cells.
Conclusions:
- The results strongly indicate that Renibacterium salmoninarum is encapsulated.
- The presence of a capsule may play a role in the pathogenicity or survival of R. salmoninarum.