Aeromonas hydrophila strains with moderate virulence.

A group of Aeromonas hydrophila strains was obtained from very different origins which showed very similar characteristics (lipopolysaccharide, outer-membrane protein profile, toxin production, bacteriophage sensitivity and moderate virulence), besides the heterogenicity observed among the A. hydrophila strains. This group of A. hydrophila strains with moderate virulence can be easily recognized by their bacteriophage sensitivity pattern.