1887

Abstract

Three Gram-negative, microaerophilic bacteria, strains ASB1, ASB2 and ASB3, with a corkscrew-like morphology isolated from the gastric mucosa of cats were studied using a polyphasic taxonomic approach. The isolates grew on biphasic culture plates under microaerobic conditions at 37 °C and exhibited urease, oxidase and catalase activities. They were also able to grow in colonies on dry agar plates. Based on 16S rRNA gene sequence analysis, ASB1, ASB2 and ASB3 were identified as members of the genus and showed 98 to 99 % sequence similarity to strains of , , ‘ Helicobacter heilmannii’, , and , six related species previously detected in feline or canine gastric mucosa. Sequencing of the partial gene demonstrated that ASB1, ASB2 and ASB3 constitute a separate taxon among the feline and canine species. The urease gene sequences of ASB1, ASB2 and ASB3 showed approximately 91 % similarity to those of ‘ Helicobacter heilmannii’. Protein profiling, the absence of alkaline phosphatase activity and several other biochemical characteristics also allowed strains ASB1, ASB2 and ASB3 to be differentiated from other species of feline or canine gastric origin. The results of this polyphasic taxonomic study show that the cultured isolates constitute a new taxon corresponding to ‘ Helicobacter heilmannii’, which was previously demonstrated in the stomach of humans, wild felidae, cats and dogs. The name sp. nov. is proposed for these isolates; the type strain is ASB1 ( = DSM 23983 = LMG 26292).

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2012-02-01
2019-12-11
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