Unknown.
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Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Firmicutes => Bacilli => Lactobacillales => Streptococcaceae => Streptococcus => Streptococcus castoreus Lawson et al. 2005.
Lancefield group A.
Lancefield group A.
Gram-positive cocci that occur in pairs or short chains.
Colonies are 0.5 mm in diameter after 24 h of incubation on horse blood agar.
Beta-haemolytic.
Facultatively anaerobic, but grows best under anaerobic conditions. Growth is
stimulated by rich medium and CO2. No growth on MRS at 37 °C in air, but there
is growth on MRS in CO2 and in a microaerophilic atmosphere. Growth on chocolate
medium is superior to growth on blood agar.
Beta-haemolytic.
Facultatively anaerobic, but grows best under anaerobic conditions. Growth is
stimulated by rich medium and CO2. No growth on MRS at 37 °C in air, but there
is growth on MRS in CO2 and in a microaerophilic atmosphere. Growth on chocolate
medium is superior to growth on blood agar.
Isolated from a dead European beaver (Castor fiber).
- Lawson P.A., Foster G., Falsen E., Markopoulos S.J. & Collins M.D.: Streptococcus castoreus sp. nov., isolated from a beaver
(Castor fiber). Int. J. Syst. Evol. Microbiol., 2005, 55, 843-846.
Positive for esculin hydrolysis, arginine dihydrolase, acid phosphatase, alkaline
phosphatase, alanine phenylalanine proline arylamidase, leucine arylamidase,
phosphoamidase, beta-glucosidase, beta-glucuronidase, acid production from:
starch, maltose, methyl beta-D-glucopyranoside, pullulan & sucrose.
Negative for hippurate hydrolysis, esterase C4, ester lipase C8, lipase C14, chymotrypsin, cystine arylamidase, alpha-fucosidase,
alpha-galactosidase, beta-galactosidase, alpha-glucosidase, glycyl tryptophan arylamidase, alpha-mannosidase, pyroglutamic acid
arylamidase, N-acetyl-b-glucosaminidase, trypsin, valine arylamidase, urease. Voges–Proskauer test acid production from: L-
arabinose, D-arabitol, cyclodextrin, glycogen, inulin, lactose, mannitol, melezitose, melibiose, raffinose, sorbitol, tagatose & trehalose.
Variable for beta-mannosidase.
phosphatase, alanine phenylalanine proline arylamidase, leucine arylamidase,
phosphoamidase, beta-glucosidase, beta-glucuronidase, acid production from:
starch, maltose, methyl beta-D-glucopyranoside, pullulan & sucrose.
Negative for hippurate hydrolysis, esterase C4, ester lipase C8, lipase C14, chymotrypsin, cystine arylamidase, alpha-fucosidase,
alpha-galactosidase, beta-galactosidase, alpha-glucosidase, glycyl tryptophan arylamidase, alpha-mannosidase, pyroglutamic acid
arylamidase, N-acetyl-b-glucosaminidase, trypsin, valine arylamidase, urease. Voges–Proskauer test acid production from: L-
arabinose, D-arabitol, cyclodextrin, glycogen, inulin, lactose, mannitol, melezitose, melibiose, raffinose, sorbitol, tagatose & trehalose.
Variable for beta-mannosidase.
(c) Costin Stoica
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