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| Streptococcus infantis |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Bacillota (Firmicutes), Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus
infantis Kawamura et al. 1998.
Member of the 'Streptococcus mitis group'. Lancefield group was not determined.
infantis Kawamura et al. 1998.
Member of the 'Streptococcus mitis group'. Lancefield group was not determined.
Gram-positive cocci, grouped in short chains. Non-motile. Non-spore-forming.
Alpha-hemolytic, small (0.3-0.8 mm in diameter) colonies after 48 hour
incubation.Grow at 37 ºC. Facultatively anaerobic. Grow on Trypticase soy agar with
5% sheep blood.
incubation.Grow at 37 ºC. Facultatively anaerobic. Grow on Trypticase soy agar with
5% sheep blood.
Isolated from human clinical samples: oral cavity (tooth surface) and pharynx.
Undetermined.
- Yoshiaki Kawamura, Xiao-Gang Hou, Yuko Todome, Ferdousi Sultana, Kenji Hirose, Sin-Ei Shu, Takayuki Ezaki & Hisashi
Ohkuni: Streptococcus peroris sp. nov. and Streptococcus infantis sp. nov., new members of the Streptococcus mitis group,
isolated from human clinical specimens. Int. J. Syst. Bacteriol., 1998, 48, 921-927. - Robert A. Whiley and Jeremy M. Hardie, 2009. Genus I. Streptococcus Rosenbach 1884, 22AL. In: (Eds.) P.D. Vos, G. Garrity, D.
Jones, N.R. Krieg, W. Ludwig, F.A. Rainey, K.-H. Schleifer, W.B. Whitman. Bergey’s Manual of Systematic Bacteriology, Volume 3:
The Firmicutes, Springer, 655-711. - BacDive in 2025: the core database for prokaryotic strain data. Isabel Schober, Julia Koblitz, Joaquim Sardà Carbasse, Christian
Ebeling, Marvin Leon Schmidt, Adam Podstawka, Rohit Gupta, Vinodh Ilangovan, Javad Chamanara, Jörg Overmann, Lorenz
Christian Reimer. Nucleic Acids Research; database issue 2025.
Positive results for beta-galactosidase, alanyl-phenylalanyl-proline arylamidase, acid
production from: fructose, galactose, glucose, lactose, mannose, maltose, salicin, sucrose and tagatose.
Negative results for alkaline phosphatase, alpha-galactosidase, arginine hydrolysis, catalase, esculin hydrolysis, hippurate hydrolysis,
beta-glucosidase, beta-mannosidase, beta-glucuronidase, glycinetryptophan arylamidase, urease, Voges-Proskauer reaction, acid
production from: dulcitol, glycerol, inositol, rhamnose, xylose, amygdalin, L-arabinose, D-arabinose, arabitol, arbutin, cyclodextrin,
glycogen, mannitol, methyl beta-D-glucopyranoside, melibiose, melezitose, pullulane, raffinose, ribose, sorbitol and trehalose.
Variable results for beta-D-fucosidase, N-acetyl-beta-glucosaminidase, pyrrolidonyl arylamidase, acid production from inulin and
pullulan.
Streptococcus infantis and Streptococcus peroris differential characters:
production from: fructose, galactose, glucose, lactose, mannose, maltose, salicin, sucrose and tagatose.
Negative results for alkaline phosphatase, alpha-galactosidase, arginine hydrolysis, catalase, esculin hydrolysis, hippurate hydrolysis,
beta-glucosidase, beta-mannosidase, beta-glucuronidase, glycinetryptophan arylamidase, urease, Voges-Proskauer reaction, acid
production from: dulcitol, glycerol, inositol, rhamnose, xylose, amygdalin, L-arabinose, D-arabinose, arabitol, arbutin, cyclodextrin,
glycogen, mannitol, methyl beta-D-glucopyranoside, melibiose, melezitose, pullulane, raffinose, ribose, sorbitol and trehalose.
Variable results for beta-D-fucosidase, N-acetyl-beta-glucosaminidase, pyrrolidonyl arylamidase, acid production from inulin and
pullulan.
Streptococcus infantis and Streptococcus peroris differential characters:
(c) Costin Stoica
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Legend: '+' = more than 85% positive; '-' = more than 85% negative; v = variable (16-84% positive).
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