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1 Centre National de la Recherche Scientifique and Université Paris 6, Station Zoologique, Villefranche sur mer 06230, France
2 Institut National de la Santé et de la Recherche Médicate U 303, CERBOM, Nice 06300, France
3 IFREMER, Centre de Brest, Plouzané 29280, France
* Corresponding author. Phone: (33) 93 76 37 80. Fax: (33) 93 76 38 93. Electronic mail address: christen{at}ccrv.obs-vlfr.fr.
ABSTRACT
The taxonomic status of Pasteurella piscicida (strain NCIMB 2058T [T = type strain] and a strain isolated from the environment) was investigated by performing phylogenetic analyses of small-subunit rRNA sequences, DNA-DNA hybridization analyses, and biochemical characterization analyses. The results of the phylogenetic analyses and the levels of DNA-DNA complementarity demonstrated conclusively that Pasteurella piscicida is extremely closely related to Photobacterium damsela ATCC 33539T. Since the two taxa exhibited a level of DNA-DNA relatedness of 80%, they are members of the same species. The high level of DNA relatedness and the presence of specific morphological and biochemical characteristics support the hypothesis that two subspecies should be recognized. On the basis of its phylogenetic position, we concluded that Pasteurella piscicida should be renamed Photobacterium damsela subsp. piscicida comb. nov.
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