| Actinomyces europeus |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Actinomycetota, Class Actinomycetes, Order Actynomycetales, Suborder Actinomycinae, Family Actinomycetaceae, Genus
Actinomyces, Actinomyces europeus Funke, Alvarez, Pascual, Falsen, Akervall, Sabbe, Schouls, Weiss and Collins 1997.
Historical synonyms : EF group 43 bacteria (Arcanobacterium bernardiae-like bacteria,
CDC coryneform group E-like bacteria).
Actinomyces, Actinomyces europeus Funke, Alvarez, Pascual, Falsen, Akervall, Sabbe, Schouls, Weiss and Collins 1997.
Historical synonyms : EF group 43 bacteria (Arcanobacterium bernardiae-like bacteria,
CDC coryneform group E-like bacteria).
Gram-positive short, irregular rods, sometimes arranged in clusters; no filament
formation. Non-motile. Non-spore-forming.
formation. Non-motile. Non-spore-forming.
Colonies are smooth, translucent grayish, 0.5 mm in diameter on Columbia agar
(Difco) supplemented with 5% horse blood at 37 ºC in air plus 5% CO2. CAMP reaction
is negative. Some strains exhibits very slight beta-hemolysis on sheep blood agar.
Facultative anaerobic.
(Difco) supplemented with 5% horse blood at 37 ºC in air plus 5% CO2. CAMP reaction
is negative. Some strains exhibits very slight beta-hemolysis on sheep blood agar.
Facultative anaerobic.
Isolated from human abscesses. Habitat is not known.
The pathogenic role is unclear.
- Funke G., Alvarez N., Pascual C., Falsen E., Akervall E., Sabbe L., Schouls L., Weiss N., and Collins M.D., 1997. Actinomyces
europeus sp. nov., isolated from human clinical specimens. Int. J. Syst. Bacteriol. Vol. 47, No. 3, 687-692.
Description is based mostly on API CORYNE , API ZYM, API 50CH (with API 50 CHE medium) results.
Positive results for esterase C4 , ester lipase C8, alpha- and beta-galactosidase, alpha-glucosidase, leucine arylamidase, valine
arylamidase, acid production from: D-glucose, maltose, galactose and fructose.
Negative results for alkaline phosphatase, catalase, chymotrypsin, N-acetyl-beta-glucosaminidase, beta-glucosidase,
beta-glucuronidase, alpha-mannosidase, nitrate reduction, pyrazinamidase, pyrrolidonyl arylamidase, trypsin, urease, acid
production from: amygdalin, L-arabinose, arbutin, gentibiose, inulin, 2-ketogluconate, lactose, mannitol, raffinose, salicin, sorbitol and
D-xylose.
Variable results for esculin hydrolysis, acid production from: adonitol, dulcitol, glycogen, mannose, melibiose, melezitose, starch,
sucrose (saccharose), rhamnose, ribose, trehalose and turanose.
Positive results for esterase C4 , ester lipase C8, alpha- and beta-galactosidase, alpha-glucosidase, leucine arylamidase, valine
arylamidase, acid production from: D-glucose, maltose, galactose and fructose.
Negative results for alkaline phosphatase, catalase, chymotrypsin, N-acetyl-beta-glucosaminidase, beta-glucosidase,
beta-glucuronidase, alpha-mannosidase, nitrate reduction, pyrazinamidase, pyrrolidonyl arylamidase, trypsin, urease, acid
production from: amygdalin, L-arabinose, arbutin, gentibiose, inulin, 2-ketogluconate, lactose, mannitol, raffinose, salicin, sorbitol and
D-xylose.
Variable results for esculin hydrolysis, acid production from: adonitol, dulcitol, glycogen, mannose, melibiose, melezitose, starch,
sucrose (saccharose), rhamnose, ribose, trehalose and turanose.
(c) Costin Stoica
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