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A polyphasic taxonomic study that included DNA-DNA hybridizations, DNA base ratio determinations, 16S rDNA sequence analysis, whole-cell protein and fatty acid analyses, AFLP (amplified fragment length polymorphism) fingerprinting and an extensive biochemical characterization was performed on 10 strains provisionally identified as Alcaligenes faecalis-like bacteria. The six environmental and four human isolates belonged to the genus Ralstonia and were assigned to a new species for which the name Ralstonia gilardii sp. nov. is proposed. The type strain is LMG 5886T.
Coenye et al. (1999) studied this question.