Actinomyces howellii
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Actinobacteria, Class Actinobacteria, Subclass Actibacteridae, Order Actynomycetales, Suborder Actinomycinae, Family
Actinomycetaceae, Genus Actinomyces,
Actinomyces howellii Dent and Williams 1984.
Gram-positive rods, 1.5-5.0 x 0.8 µm. Non-motile. Non-spore-forming.
Colonies on horse blood agar are  white, convex, smooth, shiny, translucent, up to 2
mm in diameter after 3-5 days of anaerobic incubation at 37 ºC. Facultative anaerobic.
Liquid media: CO
2 stimulates growth.
Isolated from the dental plaque of dairy cattle.
Undetermined.
  1. Dent V.E., & Williams R.A.D., 1984. Actinomyces howellii, a new species from the dental plaque of dairy cattle. Int. J. Syst.
    Bacteriol. Vol. 34, No. 3, 316-320.
Positive results for catalase, acidification of D-glucose, maltose, raffinose & sucrose.

Negative results for acid production from amygdalin, cellobiose, glycerol, inositol, inulin, mannitol, rhamnose, ribose & salicin.

Variable results for acid production from L-arabinose, lactose, mannose, melezitose
, trehalose & D-xylose.
(c) Costin Stoica
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