Abstract
One Gram stain-positive, catalase-negative, α-hemolytic, chain-forming or paired cocci, designated ST22-14T, was isolated from a blood culture of a child with suspected infection. The results of 16S rRNA gene sequences analyses showed that the most closely related species to strain ST22-14T were "Streptococcus vulneris" DM3B3T (99.2%), Streptococcus mitis NCTC 12261T (99.0%), "Streptococcus gwangjuense" ChDC B345T, (99.0%), Streptococcus oralis subsp. dentisani 7747T (99.0%), Streptococcus downii CECT 9732T (99.0%), and Streptococcus infantis ATCC 700779T (98.9%). The genome of strain ST22-14T consists of 2,053,261 bp with a G + C content of 39.4%. Average nucleotide identity values between strain ST22-14T and Streptococcus mitis NCTC 12261T or other five species were from 82.2 to 88.0%. In silico DNA–DNA hybridization of ST22-14T showed an estimated DNA reassociation value of 34.6% with the closest species. The main cellular fatty acids of strain ST22-14T were 16:0, 18:0, 14:0, 18:1ω7c and 18:1ω6c. Based on these results, strain ST22-14T should be classified as a novel species of genus Streptococcus, for which the name Streptococcus taonis sp. nov. is proposed (type strain ST22-14T = NBRC 116002T = BCRC 81402T).
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This study was supported by Taoyuan Hospital, Ministry of Health and Welfare (Grant No. PTH111042).
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Chien-Yu Lee and Chin-Kan Chan designed the work. Yi-Sheng Chen and Hui-Chung Wu wrote the main manuscript text. Momoko Chida, Mika Miyashita, Yun-Shien Lee and Wen-Ting Lin performed the genomic and biochemical analyses. Yu-Chung Chang prepared all figures.
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In this work, we did not access the medical records of the patient. Patient consent was not required since the data presented in this study do not relate to any specific person or persons. This study was approved by the Medical Ethics and Institutional Review Board of Taoyuan General Hospital, Ministry of Health and Welfare (IRB NO. TYGH111016).
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The EMBL/GenBank/DDBJ accession numbers for the 16S rRNA is LC752654 and the accession number for the Whole Genome Shotgun project is JARZZP000000000. The type stain of Streptococcus taonis sp. nov. is strain ST22-14T = BCRC 81402T (Bioresource Collection and Research Centre, Taiwan) = NBRC 116002T (Biological Resource Center, NITE, Japan).
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Lee, CY., Chan, CK., Chida, M. et al. Streptococcus taonis sp. nov., a novel bacterial species isolated from a blood culture of a patient. Arch Microbiol 206, 168 (2024). https://doi.org/10.1007/s00203-024-03884-x
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DOI: https://doi.org/10.1007/s00203-024-03884-x