Streptococcus orisuis
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus orisuis  
Takada and Hirasawa 2007.
Member of the "mutans group".
No reaction with Lancefield antisera.
Gram-positive, 0.5-0.75 um, nonmotile, nonspore-forming, cocci, arranged in pairs or
short chains.
Nonhemolytic on  blood agar, white, small colonies; 0.75-1.0 mm in diameter.
Facultatively anaerobic (microaerophilic), optimal growth at 37.0 ºC. Grows on:
Trypticase soy agar with 5% defibrinated  horse blood,
 Mitis salivarius agar.
Isolated from swine oral cavity. Resistant to bacitracin.
Oral bacteria, cariogenic activity is favorized by an adhesive, insoluble glucan produced from sucrose.
  1. Kazuko Takada and Masatomo Hirasawa: Streptococcus orisuis sp. nov., isolated from the pig oral cavity. Int J Syst Evol Microbiol
    57 (2007), 1272-1275.
  2. TAKADA Kazuko ; IGARASHI Mitsuhiko ; YAMAGUCHI Yasutaka ; HIRASAWA Masatomo: New serotype of mutans streptococci
    isolated from pig oral cavity. Microbiology and immunology  2008, vol. 52, no2, pp. 64-68.
  3. Kazuko Takada, Kazuhiko Hayashi, Yutaka Sato, and Masatomo Hirasawa. Streptococcus dentapri sp. nov., isolated from the wild
    boar oral cavity. Int J Syst Evol Microbiol April 2010 60:820-823.
Most of biochemical characteristics were tested on API commercial kits.

Positive results for alanine phenylalanine, proline arylamidase, beta-glucosidase, alpha-glucosidase, alpha-galactosidase, acid
phosphatase, leucine arylamidase, valine arylamidase, cystine arylamidase, Voges-Proskauer reaction, acid production from
D-glucose, galactose, D-fructose, D-mannose, mannitol, sorbitol, N-acetylglucosamine, amygdalin, arbutin, aesculin, salicin,
cellobiose, maltose, lactose, melibiose, sucrose, trehalose, inulin, D-raffinose, beta-gentiobiose, methyl beta-D-glucopyranoside &
tagatose.

Negative results for arginine dihydrolase, alkaline phosphatase, catalase, beta-glucuronidase, beta-galactosidase, N-acetyl-beta-
glucosaminidase & hippurate hydrolysis.
(c) Costin Stoica
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