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Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Actinobacillus suis
Etymology: Genus name: small ray rod.
Species epithet: from pigs.
Significance:  [Important]   
Taxonomy:
Phylum
Proteobacteria
Class
Gammaproteobacteria
Order
Pasteurellales
Family
Pasteurellaceae 
Genus
Actinobacillus
Type Strain: ATCC 33415 = CCUG 11624 = NCTC 12996
Macromorphology (smell):
Micromorphology: Non motile rod, usually 0.3-0.5 x 0.6-1.4 µm, but can also be more variable in length.
Gram +/Gram -:G-
Metabolism: Fakultativt anaerob
Catalase/Oxidase:+/V
Other Enzymes: Esculinase +, ornithine decarboxylase -, tryptophanase -, urease +
Biochemical Tests: Methyl red -, Voges-Proskauer -, hydrogen sulfide -
Fermentation of carbohydrates:
D-glucoselactosemaltoseL-rhamnosesucrose
+++-?
L-arabinosecellobioseD-mannitolsalicintrehalose
++-++
glycerolinulinraffinoseD-sorbitolstarch
-+?-v
Other carbohydrates: Adonitol -, dulcitol -, D-fructose +, D-galactose +, inositol -, mannose +, melibiose +.
Spec. Char.: Does not require V-factor (NAD or NADPH) for growth. Cf. other Actinobacillus spp.
Disease:See table
HostsDiseaseClinical picture
Pigs < 3 monthsActinobacillosSepticaemia, fever, rhomboid skin lesions resembling those of erysipelas, pneumonia and sudden death
Older pigsActinobacillosAnorexia, subcutaneus abscesses, mild pyrexia, metritis and meningitis
Horses (foal)Sleepy foal diseaseSome strains cause syndrome similar to A. equuli, septicaemia, arthritis, pneumonia and neophritis
Genome Sequence:
Acc-noStrainSize (bp)Genome
CP003875 H91-0380 2 484 940 1c + 0 

16S rRNA Seq.:
Acc-noStrainNumber of NTOperonSequence similarity
AY362899 ATCC 33415T 1362 99.9-100% 

Taxonomy/phylogeny:
 
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.
Updated:2020-12-10

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