Veterinary bacteriology: information about important bacteria
|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.
|Type Strain:||ATCC 49236 = CCUG 41384 = NCTC 4189.|
||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 -:||G-|
|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.|
|Disease:||Actinobacillosis or wooden tongue
|Clinical Picture:||Chronic granulomas primarely in the tongue (cattle) and adjacent lymph nodes|
|16S rRNA Seq.:|
||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.|
|Comment:||Type species for the genus|
|New names of bacterial phyla|
The taxonomic category phylum was previously not regulated by the International Code of Nomenclature of Prokaryotes (ICNP), but now this has changed and it was decided to revise the names of bacterial phyla. All phyla must be written in italics (which has been done on VetBact also before) and have the ending -ota.Published 2023-03-01. Read more...
|The taxonomy of chlamydias|
Species within the family Chlamydiaceae were previously divided into two genera Chlamydia and Chlamydophila. However, the differences between these two genera were not that great and many research groups have not accepted this division. Therefore, the genus Chlamydophila has been returned to the genus Chlamydia and this change has now been incorporated in VetBactPublished 2023-03-15. Read more...