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 CO2-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.
- 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.
- 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