Streptococcus australis
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus australis  
Willcox et al. 2001. Member of the "Mitis group". Lancefield nongroupable.
Gram-positive cocci, nonmotile, nonspore-forming, arranged in short chains.
Alpha-hemolytic, rough, white,  0.5–1.0 mm in diameter colonies.
Facultatively anaerobic, optimal growth at 37.0 ºC. Growth at 45 ºC is negative.
Grow on media: Trypticase Soy Agar with defibrinated sheep blood, BHI medium.
Isolated from the saliva of healthy children of 8-12 years, not from adults.
Oral bacteria.
  1. Willcox M.D.P., Zhu H. & Knox K.W.: Streptococcus australis sp. nov., a novel oral streptococcus. Int. J. Syst. Evol. Microbiol., 2001,
    51, 1277-1281.
  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.
Positive results for alkaline phosphatase, arginine hydrolysis, alanine-phenylalanine-
proline arylamidase, glycyl-tryptophan arylamidase, acid from lactose, pullulan,
maltose & sucrose.

Negative results for hippurate hydrolysis, beta-glucosidase, beta-glucuronidase,
alpha-galactosidase, Voges-Proskauer reaction, pyroglutamic acid arylamidase, N-acetyl-beta-glucosaminidase, beta-mannosidase,
urease, acid production from ribose, mannitol, sorbitol, trehalose, raffinose, glycogen, melibiose, melezitose, L- or D-arabinose,
methyl beta-D-glucopyranoside & tagatose.
(c) Costin Stoica
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