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Cell‐Surface‐Associated Properties of Fish Pathogenic Bacteria
Author(s) -
Santos Ysabel,
BandíN Isabel,
Nieto Teresa P.,
Barja Juan L.,
Toranzo Alicia E.,
Ellis Anthony E.
Publication year - 1991
Publication title -
journal of aquatic animal health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 52
eISSN - 1548-8667
pISSN - 0899-7659
DOI - 10.1577/1548-8667(1991)003<0297:csapof>2.3.co;2
Subject(s) - aeromonas salmonicida , biology , microbiology and biotechnology , virulence , yersinia ruckeri , bacteria , vibrio anguillarum , rainbow trout , pathogenic bacteria , protease , vibrionaceae , vibrio , fish <actinopterygii> , biochemistry , fishery , enzyme , gene , genetics
Pathogenicity assays showed that 33 of 42 potentially pathogenic strains of bacteria tested were virulent to rainbow trout Oncorhynchus mykiss . Regardless of their degree of virulence to fish, strains of motile Aeromonas , A. salmonicida , and Vibrio anguillarum were moderately hydrophobic. Only 46 and 25°10 of the strains were able to hemagglutinate human and trout erythrocytes, respectively. Hydrophobicity and hemagglutination were practically absent in isolates of Yersinia ruckeri . A notable number of the strains positively adhered to salmonid (51%) and nonsalmonid (55%) fish cells. Whereas the treatment of the bacteria with proteinase K or trypsin did not decrease the hydrophobicity of the isolates, within motile Aeromonas and A. salmonicida species, strains with both protease‐sensitive and ‐resistant hemagglutinating and adhesive abilities occurred. The effects of heat and sugars on hemagglutinating and hydrophobic properties varied within all bacterial groups. Although treatment of strains with D‐mannose or L‐fucose had distinct effects on adhesiveness according to the bacterial species and the cell system used, none of the heat‐treated (80°C for 15 min) bacteria lost their capacity to adhere to cultured fish cells. The results showed that there was no direct relationship between any of the cell surface properties analyzed and the degree of virulence of the strains.