Actinobacillus hominis
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Pasteurellales, Family Pasteurellaceae, Genus Actinobacillus,
Actinobacillus hominis
Friis-Moller 1985.
Gram-negative, small, non-motile, pleomorphic rods with small capsules.
On 5% blood agar, colonies are 1.0 mm, grayish-white, and soft mucoid. After 24
hours, colonies are flatter, with concentric rings, up to 2 mm on nutrient agar and up
to 2.5 mm and very mucoid on chocolate agar.
No hemolysis on blood agar after 24 hours, CAMP-negative.
Facultatively anaerobic. V-factor independent. Growth on MacConkey agar is negative.
Actinobacillus hominis is a rare human isolate. Not isolated from animals.
Opportunistic pathogen (isolated from patients with chronic lung disease, septicemia in hepatic failure, pleural empyema,
cardiovascular disease, diabetes, peritonitis, HIV infection, meningitis, chronic psychiatric disorders, drug addiction, chronic
alcoholism).
  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. J. G. Holt et al., 1994. Facultatively Anaerobic Gram-Negative Rods. Subgroup 3. Family Pasteurellaceae. In: Begey’s Manual of
    Determinative Bacteriology, 9th-edition, Williams & Wilkins, pp 194-196.
  4. Carmen Pinzaru, 2009. Identificarea genurilor Pasteurella, Mannheimia, Actinobacillus. In:D.Buiuc, M.Negut (Ed.), Tratat de
    Microbiologie Clinica, Ed. Medicala, Bucuresti, 859-868.
Positive results for nitrates reduction, oxidase, alkaline phosphatase, urease, ONPG,
acid production from: D(+) xylose, mannitol, D(+) galactose, D(+) glucose (without gas),
lactose, maltose, melibiose, sucrose (saccharose), trehalose & raffinose.

Negative results for catalase, gelatinase, Voges-Proskauer, arginine dehydrolase, lysine decarboxylase, ornithine decarboxylase,
indole production, acid production from: L(+) arabinose, dulcitol, D(-) sorbitol, meso-inositol,  L(+) rhamnose, L(-) sorbose, cellobiose.

Variable results for alpha-glucosidase, acid production from: D(+) mannose, esculin
& salicin.
(c) Costin Stoica
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