Actinomyces meyeri
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Actinobacteria, Class Actinobacteria, Subclass Actibacteridae, Order Actynomycetales, Suborder Actinomycinae, Family
Actinomycetaceae, Genus Actinomyces,
Actinomyces meyeri Cato, Moore, Nygaard and Holdeman 1984.

Historical synonym:
Actinobacterium meyeri Prevot 1938.
Gram-positive short rods, 0.5-0.9 / 0.9-3.0 µm, occasionally with terminal swellings;
occuring in pairs, short chains or clumps. Non-motile. Non-spore-forming.
Colonies are pinpoint to 1 mm in diameter, flat to convex, translucent to opaque,
white, with shiny and smooth surfaces on supplemented (vitamin K1 and Tween 80)
BHI blood agar after anaerobic incubation; no growth after aerobic incubation. There
is growth in peptone-yeast extract-glucose broth supplemented with vitamin K1,
hemin and Tween 80. The requirement for vitamin K1 is absolute and the growth is
stimulated by 0.02% Tween 80 and by fermentable carbohydrate. No growth in 20%
bile or 6.5% NaCl. Alpha- or non-hemolytic. Grows at 25-37 ºC; no growth at 45 ºC.
The principal habitat is human periodontal sulci.
Isolated from human clinical specimens. Susceptible to clindamycin, erythromycin, penicillin G and tetracycline.
Isolated from purulent pleural fluid, abscesses of brain, hips, hands, feet, spleen and from bite wounds.
  1. Cato E.P., Moore W.E.C., Nygaard G. and Holdeman L.V., 1984. Actinomyces meyeri sp. nov., specific epithet rev. Int. J. Syst.
    Bacteriol., Vol. 34, N0. 4, 487-489.
Decription is based on API ZYM results.

Positive results for alpha-glucosidase, acid production from: fructose, D-glucose, maltose, sucrose, ribose, starch & xylose.

Negative results for catalase, esculin hydrolysis, gelatin hydrolysis, hippurate hydrolysis, H
2S production, indole production, lipase
C14, lecithinase, nitrate reduction, starch hydrolysis, Voges-Proskauer reaction, acid production from: cellobiose, dulcitol, erythritol,
esculin, inositol, inulin, mannitol, mannose, melibiose, melezitose, pectin, raffinose, rhamnose, salicin, sorbitol, sorbose & trehalose.

Variable results for urease, acid production from: adonitol, amygdalin, arabinose, galactose, glycogen, glycerol & lactose.
(c) Costin Stoica
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