Actinomyces odontolyticus
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Actinobacteria, Class Actinobacteria, Subclass Actibacteridae, Order Actynomycetales, Suborder Actinomycinae, Family
Actinomycetaceae, Genus Actinomyces,
Actinomyces odontolyticus Batty 1958.
Gram-positive irregular, diphtheroid or branched rods, occurring filaments. Non-motile.
Non-spore-forming.
Colonies are small, smooth, may have dense center and occasional may be
filamentous, like those of
A. israelii, after 24-48 h on BHI agar; the colonies are up to 1
mm, circular to irregular, low convex and smooth to slightly granular on blood agar
and may produce a green area around them, like alpha-streptococci. After 7-14 days
the colonies are 1-2 mm in diameter on BHI agar, convex or umbonate, circular to
irregular, raised, opaque, white, soft and smooth or granular. Colonies of some
strains may have  “molar-tooth” aspect, like those of
A. israelii. After 2-14 days on
blood agar, the colonies are dark red in transmitted light and may be difficult to
subculture.
Growth is turbid, sometimes flocculent, in BHI broth. Most strains are
serophilic
. Facultative anaerobic. Grows best in presence of CO2. Grows at 35-37 ºC,
optimally.
Alpha haemolysis may occur.
Oral cavity of man is normal habitat. There are two serotypes.
Isolated from deep dentinal caries in man.
  1. Slack J.M., 1975. Genus Actinomyces Harz 1877 . In: Buchanan R.E. and Gibbons N.E. (Editors), Bergey’s Manual of
    Determinative Bacteriology, Eight Edition, The Williams & Wilkins Company, Baltimore, 660-667.
  2. Johnson J.L., Moore L.V.H., Kaneko B. and Moore W.E.C., 1990. Actinomyces georgiae sp. nov. , Actinomyces gerencseriae sp.
    nov. , Designation of Two Genospecies of Actinomyces naeslundii, and Inclusion of A. naeslundii serotypes II and III and
    Actinomyces viscosus serotype II in A. naeslundii Genospecies 2. Int J Syst Bacteriol Vol. 40, No. 3, 273-286.
Non-acid-fast.

Positive results for
H2S production, methyl red, nitrate reduction, acid production from: fructose, glucose, glycerol & sucrose
(saccharose).


Negative results for
catalase, gelatin hydrolysis, indole production, starch hydrolysis, urease, Voges-Proskauer test, acid production
from:
amygdalin, cellobiose, dulcitol, esculin, inositol, inulin, mannitol, mannose, melibiose, melezitose, raffinose, sorbitol &
trehalose.


Variable results for
esculin hydrolysis, acid production from: adonitol, arabinose, glycogen, lactose, maltose, rhamnose, ribose,  
salicin, starch & xylose.
(c) Costin Stoica
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