1887

Abstract

Previously, a group of 40 -like strains that were isolated from water and fish were called group X2. These strains produced acid from -rhamnose, did not ferment sorbose, cellobiose, melibiose, or raffinose, and rarely fermented sucrose (5% in 48 h, 10% in 7 days). This pattern of reactions separated group X2 strains from and Positive reactions for acetoin production (Voges-Proskauer test), ornithine decarboxylase, and lack of acid production from melibiose distinguished group X2 strains from both and Group X2 strains exhibited variable reactions only in tests for citrate utilization, hydrolysis of Tween 80, and acid production from maltose. Genetically, group X2 strains formed a single deoxyribonucleic acid hybridization group with an average level of relatedness of 86% or more (86% as determined by the S1 method at 60°C or by the hydroxyapatite method at 75°C and 92% as determined by the hydroxyapatite method at 60°C). The level of divergence among related sequences in 60°C reactions was 0.5%, as determined by the hydroxyapatite method. The relatedness of group X2 strains to other species was 42 to 73% in 60°C reactions. The divergence in these reactions was 11.0 to 15.5%, and the relatedness to other yersiniae in 75°C reactions was 21 to 38%. Group X2 strains were 11 to 32% related to 67 species of the that belonged to genera other than On the basis of these biochemical and genetic data, we believe that group X2 represents a single new species in the genus The name sp. nov. is proposed for this species. The type strain of is strain CNY 6005 (= CDC 669-83 = ATCC 35236).

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1984-04-01
2022-08-16
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