Streptococcus hyointestinalis
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus hyointestinalis  
Devriese et al. 1988.

No reaction with streptococcal group A, B, C, D, F, and G antisera.
Gram-positive cocci, grouped in chains.
Colonies are transparent, 1 to 2.5 mm in diameter after 1-3 days of incubation, circular
with entire edges and narrow zones of alpha hemolysis on blood agar.
Optimum growth at 37 ºC, facultatively anaerobic.
Grow on media: Trypticase soy agar with defibrinated sheep blood, Brain heart infusion
agar. Can't grow in 6.5% NaCl or 40% bile.
Isolated from the small and large intestines (colon) of pigs.
Is part of the intestinal microflora of swine.
  1. 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.
  2. Holt J.G., Krieg N.R., Sneath P.H.A., Staley J.T. and Williams S.T., 1994. Bergey's Manual of Determinative Bacteriology, Ninth
    Edition, Williams & Wilkins, A Waverly Company, Baltimore, pp 527-558.
  3. Devriese L.A., Kilpper-Balz R. & Schleifer K.H.: Streptococcus hyointestinalis sp. nov. from the gut of swine. Int. J. Syst. Bacteriol.,
    1988, 38, 440-441.
Positive results for amylase, alkaline phosphatase, esculin hydrolysis, leucine arylamidase, Voges-Proskauer reaction, acid
production from: arbutin, fructose, glucose, galactose, lactose, maltose, mannose, N-acetylglucosamine, salicin, saccharose,
starch & trehalose.

Negative results for catalase, beta-glucuronidase, beta-galactosidase, pyrrolidonylarylamidase, arginine dihydrolase, hippurate
hydrolysis, hyaluronidase, acid production from: glycerol, erytritol, arabinose, ribose, xylose, adonitol, alpha-methylxyloside,
sorbose, rhamnose, dulcitol, inositol, mannitol, sorbitol, glycogen, xylitol, D-turanose, L-lyxose, D-tagatose, L-fucose, arabitol,
gluconate,  2- or 5-ketogluconate.

Variable results for alpha-galactosidase, beta-gentiobiose, acid production from: amygdalin, cellobiose & raffinose.
(c) Costin Stoica
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