干旱区生态环境知识资源中心

We herein report the isolation and characterization of 21 Gram- stain- negative strains cultivated from the oropharynx of healthy children in Israel and Switzerland. Initially described as small colony variants of Kingella kingae, phenotypic analysis, biochemical analysis, phylogenetic analysis based on sequencing of the partial 16S rRNA gene and five housekeeping genes (abcZ, adk, G6PD, groEL and recA), and whole genome sequencing and comparison between members of the genera Kingella and Neisseria provided evidence for assigning them to the genus Kingella. Cellular fatty acids included important amounts of C-12 : 0, C-14 : 0, C-16 : 0 and C-16 : 1n7. Digital DNA- DNA hybridization between the isolates Sch538(T) and K. kingae ATCC 23330(T) revealed relatedness of 19.9 %. Comparative analysis of 16S rRNA gene sequences available in GenBank allowed matches to strains isolated in the USA, suggesting a wider geographical distribution. A novel species named Kingella negevensis sp. nov. is proposed, as most strains have been isolated in the Negev, a desert region of southern Israel. The type strain is Sch538(T) (=CCUG 69806(T)=CSUR P957).