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Species/Subspecies: Actinobacillus lignieresii
Etymology: Genus name: small ray rod (ray refers to the histological picture of radially localized club-like structures around the bacterial core).
Species epithet: named after the bacteriologist J. Lignières, who first isolated this organism.
Significance:  [Important]   
Type Strain: ATCC 49236 = CCUG 41384 = NCTC 4189.
Macromorphology (smell):
Actinobacillus lignieresii Actinobacillus lignieresii 
Small viscous and grayish colonies (1-2 mm in diameter). No hemolysis on blood agar.
Micromorphology: Small nonmotile rod or coccoid rod (0.4 x 1.15-1.25 µm). Small granules can be observed at the poles of the bacteria. Long filamentous forms can be observed if the medium contains glucose or maltose.
Gram +/Gram -:
Fig. 106:3. Gram staining of Actinobacillus lignieresii, strain B10375/10. The length of the scale bar corresponds to 5 µm. Date: 2010-04-23.

 Fig. 106:4. Gram staining of Actinobacillus lignieresii, strain B10375/10. The arrows indicate some of the granules, which can be seen. The total length of the scale bar corresponds to 5 µm. Date: 2010-04-23. 
Metabolism: Facultatively anaerobic
Other Enzymes: Ornithine decarboxylase -, tryptophanase -, urease +
Biochemical Tests: Methyl red -, Voges-Proskauer V, hydrogensulfide +
Fermentation of carbohydrates:
Other carbohydrates: Adonitol -, dulcitol -, D-fructose +, D-galactose +, inositol -, D-mannose +, melibiose -.
Spec. Char.: Temperature optimum: 37°C. Does not require V-factor (NAD or NADPH) for growth. Cf. other Actinobacillus spp.
Hosts: Cattle, sheep
Disease (Swedish):Aktinobacillos, mjukdelsaktinos eller trätunga. (äldre namn på sjukdomen: "strålsvamp", som framför allt har använts för infektion med Actinomyces bovis, eller aktinos.)
Disease (English):Actinobacillosis or wooden tongue
Clinical Picture: Chronic granulomas primarely in the tongue (cattle) and adjacent lymph nodes
Genome Sequence:
Acc-noStrainSize (bp)Genome
Not reported    

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
M75068 (T) 1487  

 Actinobacillus lignieresii
About 17 species have been described within genus Actinobacillus, but the relationship between members within the closely related genera Actinobacillus, Haemophilus, Mannheimia and Pasteurella is very uncertain since none of these genera forms monophyletic clusters.
Comment:Type species for the genus
Reference(s): No. 96

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Swedish University of Agricultural Sciences