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.
- 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, H2S 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