1887

Abstract

On the basis of phenotypic and DNA relatedness data, three novel species of the genus are proposed, (63287 =CIP 106336 =CCUG 43117), (34635 =CIP 106340 =CCUG 43114) and (34614 =CIP 106338 =CCUG 43111). The original description of the genus included thiosulphate oxidation as a phenotypic feature, when the sole and type species of the genus, , was proposed. The three novel species described herein were not able to oxidize thiosulphate; thus, it is proposed that this characteristic be removed from the description of the genus and considered as specific for . The novel species of the genus proposed here form a well-separated cluster in the group of the α-2 subclass of the , on the basis of 16S rDNA gene sequence analysis. However, 16S rDNA gene sequence analysis was not sufficient to delineate the species; hence, DNA–DNA relatedness and phenotypic data were also required. All of the novel species described in this study are fastidious bacteria isolated from a hospital water supply, using co-cultivation with amoebae. This group of bacteria are hypothesized to be a potential cause of nosocomial infections. For treatment of infections caused by these novel bacteria, doxycycline appears to be the sole antibacterial compound with a consistently low MIC value.

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2003-01-01
2021-03-07
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