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Streptococcus tigurinus sp. nov., isolated from blood of patients with endocarditis, meningitis and spondylodiscitis


Zbinden, Andrea; Mueller, Nicolas J; Tarr, Philip E; Spröer, Cathrin; Keller, Peter M; Bloemberg, Guido V (2012). Streptococcus tigurinus sp. nov., isolated from blood of patients with endocarditis, meningitis and spondylodiscitis. International Journal of Systematic and Evolutionary Microbiology, 62(Pt 12):2941-2945.

Abstract

Four Gram-stain-positive, catalase-negative, coccus-shaped bacterial strains were isolated from multiple blood cultures of patients with endocarditis, meningitis and spondylodiscitis. The isolates were tentatively identified as viridans streptococcal species based on phenotypic characteristics. Comparative 16S rRNA gene sequencing studies showed that the organisms were members of the Streptococcus mitis group but did not correspond to any recognized species. The nearest phylogenetic relative was Streptococcus mitis ATCC 49456(T) with 98.6% sequence similarity. The representative strain AZ_3a(T) showed similarity values of less than 96.8%, 97.6%, 94.5% and 95.5% to the phylogenetically most closely related species by recA, rpoB, sodA and groEL gene sequence analysis, respectively. DNA-DNA hybridization analyses showed a low reassociation value of 32.2% between strain AZ_3a(T) and S. mitis DSM 12643(T). Reassociation values with other S. mitis group species ranged from 27.3% to 49.7%. The G+C content of the DNA is 40.0 mol%. Based on our biochemical and molecular analyses, the novel isolates represent a new species, for which the name Streptococcus tigurinus sp. nov. is proposed. The type strain is AZ_3a(T)( =CCOS 600(T) =DSM 24864(T)).

Abstract

Four Gram-stain-positive, catalase-negative, coccus-shaped bacterial strains were isolated from multiple blood cultures of patients with endocarditis, meningitis and spondylodiscitis. The isolates were tentatively identified as viridans streptococcal species based on phenotypic characteristics. Comparative 16S rRNA gene sequencing studies showed that the organisms were members of the Streptococcus mitis group but did not correspond to any recognized species. The nearest phylogenetic relative was Streptococcus mitis ATCC 49456(T) with 98.6% sequence similarity. The representative strain AZ_3a(T) showed similarity values of less than 96.8%, 97.6%, 94.5% and 95.5% to the phylogenetically most closely related species by recA, rpoB, sodA and groEL gene sequence analysis, respectively. DNA-DNA hybridization analyses showed a low reassociation value of 32.2% between strain AZ_3a(T) and S. mitis DSM 12643(T). Reassociation values with other S. mitis group species ranged from 27.3% to 49.7%. The G+C content of the DNA is 40.0 mol%. Based on our biochemical and molecular analyses, the novel isolates represent a new species, for which the name Streptococcus tigurinus sp. nov. is proposed. The type strain is AZ_3a(T)( =CCOS 600(T) =DSM 24864(T)).

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Institute of Medical Microbiology
04 Faculty of Medicine > University Hospital Zurich > Clinic for Infectious Diseases
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Language:English
Date:2012
Deposited On:25 Oct 2012 14:42
Last Modified:07 Dec 2017 15:47
Publisher:Society for General Microbiology
ISSN:1466-5026
Publisher DOI:https://doi.org/10.1099/ijs.0.038299-0
PubMed ID:22357776

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