1887

Abstract

The species and the associated genus were originally described by Zhang [ (2008), 431–439] on the basis of few endophytic nitrogen-fixing bacteria isolated from wild rice () in China. In this study, we demonstrate that a number of clinical isolates that were either described in the literature, preserved in culture collections, or obtained during a 2013 multi-state sepsis outbreak in Brazil also belong to the same genus. 16S rRNA gene sequencing, multilocus sequence analysis based on , , and genes, as well as digital DNA–DNA hybridization support the existence of a second species within the genus . All isolates from the recent Brazilian outbreak, along with some older American clinical strains, were found to belong to the already described species , whereas three clinical strains retrieved in the USA over a time span of almost four decades, could be assigned to a new species. Implementation of an extended set of biochemical tests showed that the two species could phenotypically be discriminated from each other by the ability to utilize -sorbose and -serine. This feature was limited to the strains of the novel species described herein, for which the name sp. nov. is proposed, with ATCC 27989 (=CNCTC 5729) as the designated type strain. An emended description of the species and of the genus is also provided.

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2018-01-01
2024-03-28
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