Streptococcus infantis
 
Alkaline
phosphatase
Beta-D-
galactosidase
Beta-D-
fucosidase
N-acetyl-beta-D-
glucosaminidase
Pyrrolidonyl
arylamidase
Inulin
fermentation
Pullulan
fermentaion
Tagatose
fermentation
S. infantis
-
+
v
v
v
v
v
+
S. peroris
v
v
-
-
-
-
-
-
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum 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.
Cells are nonsporulating, nonmotile, Gram-positive cocci, grouped in short chains.
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.
Isolated from human clinical samples: oral cavity (tooth surface) and pharynx.
Undetermined.
  1. 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.
  2. 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.
Positive results for beta-galactosidase, alanyl-phenylalanyl-proline arylamidase, acid
production from: lactose, maltose, sucrose & 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: amygdalin, L-arabinose, D-arabinose, arabitol, arbutin, cyclodextrin, glycogen, mannitol, methyl
beta-D-glucopyranoside, melibiose, melezitose, pullulane, raffinose, ribose, sorbitol & trehalose.

Variable results for beta-D-fucosidase, N-acetyl-beta-glucosaminidase, pyrrolidonyl arylamidase, acid production from inulin & 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).