Actinobacillus arthritidis
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Pasteurellales, Family Pasteurellaceae, Genus Actinobacillus,
Actinobacillus arthritidis
Christensen, Bisgaard, Angen and Olsen 2002.
Synonyms: Bisgaard Taxon 9 (sorbitol positive strains; isolates sorbitol negative are tentatively designated genomospecies 2,
Christensen et al., 2002).
Gram-negative, pleomorphic cells (rods). Nonmotile. Nonsporulated.
Colonies are circular, raised and regular with an entire margin; the surface of the
colonies is smooth, shiny, grayish and nontransparent. Mucoid and watery cultures
also exist.
Diameter is 2-3 mm after 24 h aerobic incubation at 37 ºC. No hemolysis on sheep
and bovine blood agar.
Growth on MacConkey agar is variable. V-factor independent.
Isolated from the oral cavity of apparently healthy horses, as well as from diseased foals and horses (with septicemia and arthritis).
Have been isolated from diseased foals and horses (with septicemia and arthritis).
  1. Olsen I., Moller K., 2004. Genus II. Actinobacillus. In: Bergey’s Manual of Systematic Bacteriology, Second edition, Vol two, part B,
    George M. Garrity (Editor-in-Chief), pp. 866-883.
  2. W.M. Janda, R. Mutters, 2006. Pasteurella, Mannheimia, Actinobacillus, Eikenella, Kingella, Capnocytophaga, and other
    miscellaneous Gram-negative rods. In: Topley & Wilson’s Microbiology and Microbial Infections, 10 edition, Vol. 2, Bacteriology,
    Edward Arnold Ltd.
  3. Christensen H., Bisgaard M., Angen O. and Olsen J.E.: Final classification of Bisgaard taxon 9 as Actinobacillus arthritidis sp. nov.
    and recognition of a novel genomospecies for equine strains of Actinobacillus lignieresii. Int. J. Syst. Evol. Microbiol., 2002, 52,
    1239-1246.
Positive results for nitrates reduction, oxidase, alkaline phosphatase, catalase, urease,
ONPG, acid production from: D(+) xylose, mannitol, D(-) sorbitol, D(-) fructose, D(+)

galactose, D(+) glucose, D(+) mannose,  lactose, maltose, melibiose, sucrose (saccharose) & raffinose.
(The sorbitol-negative isolates are tentatively designated genomospecies 2, Christensen et al., 2002).

Negative results for gelatinase, H
2S production, Voges-Proskauer, arginine dehydrolase, lysine decarboxylase, ornithine
decarboxylase, indole, xylitol, dulcitol, meso-inositol, L(+) rhamnose, trehalose , L(-) sorbose, cellobiose, inulin, esculin, salicin,
alpha-glucosidase (PNPG) & gas from D(+) glucose.

Variable results for glycerol, L(+) arabinose & dextrin.
(c) Costin Stoica
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