Streptococcus ursoris
Results are based on Rapid ID32 Strep, API 50 CH and API ZYM identification kits.

Positive results for aesculin hydrolysis, arginine dihydrolase, alanyl-phenylalanyl-proline arylamidase, beta-glucosidase, alpha-
glucosidase, alpha-galactosidase, naphthol-AS-BI-phosphohydrolase, acid phosphatase, valine arylamidase, cystine arylamidase,  
leucine arylamidase, Voges–Proskauer test, acid production from: N-acetylglucosamine, cellobiose, D-fructose, D-glucose, D-
galactose, D-mannose, mannitol, melibiose, maltose, lactose, raffinose, D-ribose, sorbitol, salicin, sucrose, trehalose & D-tagatose.

Negative results for alkaline phosphatase, catalase, hippurate hydrolysis, beta-galactosidase, beta-glucuronidase, N-acetyl-beta-
glucosaminidase, urease, acid production from: D-arabinose, glycogen, inulin, starch & D-xylose.
Taxonomy
Morphology
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Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus ursoris
Shinozaki-Kuwahara et al. 2011.

Non-groupable with Lancefield antisera (Oxoid kit).
Gram-positive cocci, 0.5-0.7 μm in diameter grouped in pairs and short chains. Non-
spore-forming.
Colonies are white, non-haemolytic and 0.75-1.0 mm in diameter after incubation on
blood agar at 37 ºC for 24 hours. On Mitis-Salivarius agar, colonies appear small,
dark blue and crinkled. Facultatively anaerobic. No growth at 45 ºC in BHI broth.
Isolated from the oral cavities of Japanese black bears (Ursus thibetanus japonicus). Sensitive to bacitracin (2 U/ml).
Undetermined.
  1. Noriko Shinozaki-Kuwahara,  Kazuko Takada, Masatomo Hirasawa. Streptococcus ursoris sp. nov., isolated from the oral cavities
    of bears. Int J Syst Evol Microbiol, January 2011 61: 40-44.
(c) Costin Stoica
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