Streptococcus minor
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus minor  
Vancanneyt et al. 2004.
Does not react with Lancefield groups A, B, C, D, F or G antisera.
Small, under 1 μm, Gram-positive cocci, arranged in small groups.
Colonies are 0.5 mm in diameter, unpigmented, regular, translucent and
alpha-hemolytic. Grows better in CO
2-enhanced atmosphere. Facultatively anaerobic,
growth temperature 37 ºC. Can grow at 25 ºC. Growth at 42 ºC is weaker than at 37 ºC.
Grows on: Trypticase soy agar with defibrinated sheep blood, Brain heart infusion
broth, Edwards medium. Blackening is observed on Bile-esculin agar (Oxoid).
Isolated from tonsils of dogs, cats and cattle also from intestinal tract of dogs.
Unknown.
  1. Vancanneyt M., Devriese L.A., De Graef E.M., Baelle M., Lefebvre K., Snauwaert C., Vandamme P., Swings J. & Haesebrouck F.:
    Streptococcus minor sp. nov., from faecal samples and tonsils of domestic animals. Int. J. Syst. Evol. Microbiol., 2004, 54, 449-452.
  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.
Characters' description is based on API tests.
Biochemically close to
S. suis (wich is beta-glucuronidase positive).

Positive results for esculin hydrolysis, leucine arylamidase, acid production from: N-acetylglucosamine, cellobiose, D-fructose,
galactose, beta-gentiobiose (often delayed), D-glucose, glycogen, lactose, D-mannose, mannitol (often delayed), maltose, salicin,
sucrose & trehalose.

Negative results for hippurate hydrolysis, beta-glucuronidase, beta-galactosidase, pyrrolidonyl arylamidase, acid production from:
adonitol, DL-arabinose, DL-arabitol, dulcitol, erythritol, DL-fucose, gluconate, glycerol, inositol, 2- or 5-ketogluconate, D-lyxose, methyl
alpha-D-mannoside, methyl alpha-glucoside, methyl beta-xyloside, melibiose, melezitose, rhamnose, ribose, L-sorbose, D-turanose,
DL-xylose & xylitol.

Variable results for alpha-galactosidase (often weak), alkaline phosphatase, hydrolysis of p-nitrophenyl phosphate, acid production
from: amygdalin, arbutin, inulin, D-raffinose, starch, sorbitol & D-tagatose.
(c) Costin Stoica
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