Abstract
Abstract The pathogenicity of 28 Aeromonas salmonicida isolates was investigated by intraperitoneal injection into juvenile brook trout Salvelinus fontinalis. Ten isolates were found to be virulent, killing 100% or 87–100% of experimental animals following injections of 1 × 106 or 1 × 103 colony-forming units (CFU)/fish, respectively. All virulent isolates possessed an A layer, autoaggregated in liquid culture, and were positive on Coomassie brilliant blue and Congo red (CR) media. Nine isolates, which were negative for all of the above characteristics, were avirulent in fish and caused no mortality following an injection of 1 × 106 CFU/fish. The last group of nine isolates was also avirulent (no mortality after an injection of 1 × 106 CFU/fish) and are referred to as A+ avirulent strains because they possess the same in vitro characteristics as the virulent strains described above. For all isolates, the following cell-surface-related properties were then investigated: Cell-surface hydrophobicity, presenc...
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