Abstract
An integrated genotypic and phenotypic analysis of 12 Centers for Disease Control (CDC) group IVc-2 strains revealed that this taxon represents a novel species belonging to the genus Ralstonia. Comparative 16S rDNA sequence analysis allocated a representative CDC group IVc-2 strain to the Ralstonia branch of the beta subclass of the Proteobacteria. DNA-DNA hybridizations did not detect significant binding levels towards any presently known Ralstonia species, including Ralstonia pickettii. Its DNA base ratio is between 65 and 67 mol%. The name Ralstonia paucula sp. nov. is proposed, with strain LMG 3244 (= CDC E6793), isolated from a human respiratory tract, as the type strain. R. paucula can be differentiated from other Ralstonia species by whole-cell protein analysis, amplified rDNA restriction analysis and a variety of classical biochemical tests. Strains have been isolated from various human clinical and environmental sources.
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