Actinomyces europeus
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Actinobacteria, Class Actinobacteria, Subclass Actibacteridae, 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).
Gram-positive short, irregular rods, sometimes arranged in clusters; no filament
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% CO
2.
Facultative anaerobic. CAMP reaction is negative. Some strains exhibits very slight
beta-hemolysis on sheep blood agar.
Isolated from human abscesses. Habitat is not known.
The pathogen role is unclear.
  1. 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 & 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 &
D-xylose.

Variable results for esculin hydrolysis, acid production from: adonitol, dulcitol, glycogen, mannose, melibiose, melezitose, starch,
sucrose (saccharose), rhamnose, ribose, trehalose & turanose.
(c) Costin Stoica
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