Streptococcus canis
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus canis  Devriese
et al. 1986. Lancefield group G.
Gram-positive  cocci, nonmotile, grouped in pairs or chains.
Round, beta-hemolytic, nonpigmented colonies.Growth at 37 ºC. Aerobic, facultatively
anaerobic. Grow on complex media: Trypticase soy agar with 5% sheep blood,
Mueller-Hinton medium enriched with 5% sheep blood, Brain heart infusion medium.
A precipitate and clear supernatant are formed in broth cultures. CAMP-negative. No
growth in the presence of 6.5% NaCl or 40% bile.
Isolated from animals (skin, upper respiratory tract & uro-genital tract, also from bovine milk). Human isolates are rare.
Dogs: dermatitis, otitis, metritis, vaginitis, pharyngitis. Cats: pharyngitis, sinusitis,septicemia, vaginitis
Bovines: mammitis.
Humans: septicemia (rare).
  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., Hommez J., Kilpper-Balz R. & Schleifer K.H.: Streptococcus canis sp. nov.: a species of group G streptococci from
    animals. Int. J. Syst. Bacteriol., 1986, 36, 422-425.
  4. P. A. Pesavento, M. J. Bannasch, R. Bachmann, B. A. Byrne and K. F. Hurley: Fatal Streptococcus canis Infections in Intensively
    Housed Shelter Cats. Vet Pathol 44:218-221 (2007).
  5. F Bert and N Lambert-Zechovsky: Septicemia caused by Streptococcus canis in a human. Journal of Clinical Microbiology, 03
    1997, 777-779, Vol 35, No. 3
  6. L. L. Tikofsky1 and R. N. Zadoks: Cross-Infection Between Cats and Cows: Origin and Control of Streptococcus canis Mastitis in a
    Dairy Herd. J. Dairy Sci. 88:2707-2713
Positive results for L-aminopeptidase, alkaline phosphatase, leucine arylamidase,
arginine hydrolisis, esculin hydrolysis, beta-galactosidase, acid production from:
D-fructose, galactose, D-glucose, N-acetylglucosamine, lactose, maltose, D-mannose,
ribose, salicin, starch & sucrose.

Negative for hippurate, fibrinolysin, tyrosine, starch hydrolysis, Voges-Proskauer, pyrrolidonyl arylamidase, acid production from:
adonitol, amygdalin, L- or D-arabinose, D-arabitol, dulcitol, erythritol, D- or L-fucose, beta-gentiobiose, gluconate, 2-ketogluconate,
inositol, inulin, D-lyxose, mannitol, methyl alpha-D-mannoside, melezitose, melibiose, D-raffinose, rhamnose, sorbitol, L-sorbose,
D-tagatose, trehalose (few strains may be positive), D-turanose, xylitol, D- or L-xylose & methyl beta-xyloside.

Alpha-galactosidase is variable. Some strain may give weak acid production from glycogen.
(c) Costin Stoica
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