| Species/Subspecies: | Actinobacillus equuli subsp. equuli | |||||||||
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| Etymology: | Genus name: small ray rod. Species epithet: from a foal. Subspecies epithet: see subspecies epithet. | |||||||||
| Significance: | [Very important] | |||||||||
| Alternative Species Name(s): | Actinobacillus equuli | |||||||||
| Taxonomy: | Class Gammaproteobacteria Order Pasteurellales Family Pasteurellaceae Genus Actinobacillus |
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| Type Strain: | ATCC 19392 = CCUG 2041 = NCTC 8529 | |||||||||
| Macromorphology (smell):
| Forms very viscous colonies with no hemolysis on blood agar. | |||||||||
| Micromorphology: | Rod shaped (0.3-0.5 x 0.6-1.4 µm) and non-motile. Long (up to 6 µm) filamentous forms are formed if the medium contains glucose or maltose. | |||||||||
| Gram +/Gram -: | G- | |||||||||
| Metabolism: | Facultatively anaerobic | |||||||||
| Catalase/Oxidase: | V/+ | |||||||||
| Other Enzymes: | Ornithine decarboxylase -, urease +, tryptophanase -. | |||||||||
| Biochemical Tests: | Methyl red -, Voges-Proskauer -, hydrogen sulfide V | |||||||||
| Fermentation of carbohydrates: | D-glucose + lactose + maltose + L-rhamnose - sucrose + L-arabinose v cellobiose - D-mannitol + salicin - trehalose + glycerol v inulin - raffinose ? D-sorbitol - starch v |
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| Spec. Char.: | Does not require V-factor (NAD or NADPH) for growth. Cf. other Actinobacillus spp. | |||||||||
| Special Media:
| A. equuli subsp. equuli can be cultivated on purple agar and ferments lactose under acid production (see Fig. 107:3). | |||||||||
| Disease: | See table
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| Genome Sequence: |
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| 16S rRNA Seq.: |
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| Taxonomy/phylogeny:
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About 18 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. | |||||||||
| Reference(s): | No. 32 | |||||||||
| Updated: | 2023-03-29 |