A collection of 94 isolates closely related to , together with named reference and type strains, were investigated for phenotypic and genotypic properties. Using amplified fragment length polymorphism (AFLP), nine clusters were recognized. The largest cluster ( = 36), considered to be the bona fide group, contained the type strains of and and most of the strains isolated from fish. The type strains of all other species, including and , clustered outside this group. By ribotyping, and patterns were very similar, insofar as they shared most bands. The type strain had several bands in common with the type strains of both and , whereas the other species were clearly distinct from these three species. DNA-DNA hybridization experiments showed 88% DNA binding between the type strains of and , whereas the DNA binding between and was 40%. Although the delineation of the species is still uncertain, the authors propose, on the basis of a number of tests, to delineate a core of strains which contained the type strains of both and . It is concluded that is the junior synonym of


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