Description of Streptococcus thalassemiae sp. nov., a Bacterium Isolated from Human Blood

Author:

Diouf Fatou Samba12,Beye Mamadou23,Gaye Mapenda12,Mbaye Babacar12,Alibar Stephane12,Sarr Mariema12,Dubourg Gregory12,Lagier Jean-Christophe12,Sokhna Cheikh124,Fenollar Florence23,Fournier Pierre-Edouard23,Lo Cheikh Ibrahima23ORCID

Affiliation:

1. Aix Marseille University, IRD, AP-HM, MEPHI, Marseille, France

2. IHU-Mediterranean Infection, Marseille, France

3. Aix Marseille University, IRD, AP-HM, SSA, VITROME, Marseille, France

4. Campus Commun UCAD-IRD of Hann, Dakar, Senegal

Abstract

Blood is a precious biological liquid that is normally sterile. Therefore, bacteria in the bloodstream are shown a priori anomaly. A blood culture is systematically performed to diagnose the cause of the bacteremia. Indeed, a patient received in our service had a thalassemia major and underwent a genoidentical transplant. Then, a blood test was performed to diagnose a four-day fever. In this context, we have isolated strain Marseille-Q2617 from the blood sample. It revealed a new bacterial strain that belongs to the genus Streptococcus. It is a Gram-positive coccus, nonmotile, and nonspore forming. The major fatty acid found is hexadecanoic acid, with 49.5%. A taxonomic method was used to characterize the strain by studying their phenotypic, phylogenetic, and genomic characteristics. In addition, sequence analysis of the 16S rRNA gene shows that the strain Marseille-Q2617 has 99.94% sequence similarity to Streptococcus mitis. Average nucleotide identity (ANI) analysis for strain Marseille-Q2617T showed the highest similarity of 92.9% with S. mitis. The DNA-DNA hybridization value obtained (50.2%) between strain Marseille-Q2607 and S. mitis, its closest related species, was below the recommended threshold (<70%). Strain Marseille-Q2617T has a genome size of 2.02 Mbp with 40.5 mol% of G + C content. Based on these results, we propose a new species of the genus Streptococcus, for which the name Streptococcus thalassemiae sp. nov., Marseille-Q2617T (=CSUR Q2617 = CECT 30109) was proposed.

Funder

Institut Hospitalo-Universitaire

Publisher

Hindawi Limited

Subject

Microbiology (medical),Microbiology

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1. Validation List no. 214. Valid publication of new names and new combinations effectively published outside the IJSEM;International Journal of Systematic and Evolutionary Microbiology;2023-12-01

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