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Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Nicoletella semolina
Etymology: Genus name: named after the Swiss bacteriologist Jacques Nicolet, who has studied the family Pasteurellaceae in his research.
Species epithet: semolina (the colonies look like semolinas).
Significance:Is regularly isolated from Swedish horses with respiratory problems, but it does not necessarily prove that N. semolina is the causative agent
  [Important]   
Taxonomy:
Phylum
Proteobacteria
Class
Gammaproteobacteria
Order
Pasteurellales
Family
Pasteurellaceae 
Genus
Nicoletella
Type Strain: CCUG 43639.
Macromorphology (smell):
     
 
Small white colonies (0.5-2 mm in diameter), which are similar to semolinas. The colonies can be moved on the agar surface with a plastic loop without losing the shape. Give no hemolysis at blood agar.
Micromorphology: Short, non-motile and pleomorphic rods.
Gram +/Gram -:
   
G-
Catalase/Oxidase:+/+
Other Enzymes: Eskulinase (= beta-glucosidase) (-), ornithine decarboxylase -, tryptophanase (indole) -, urease +
Biochemical Tests: Citrate -, hydrogen sulphide -.
Fermentation of carbohydrates:
D-glucoselactosemaltoseL-rhamnosesucrose
-----
L-arabinosecellobioseD-mannitolsalicintrehalose
-----
glycerolinulinraffinoseD-sorbitolstarch
-----
N. semolina is also negative for D-galactose and seem to be non-fermentative.
Spec. Char.:
Disease:
HostsDiseaseClinical picture
HorsesAirway diseaseCough, mucus discharge from the nasal cavity, opportunist
16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AY508816 (T) 1365  

Taxonomy/phylogeny:
 
There is only one species described within the genus Nicoletella. which is relatively close to Histophilus somni, which also is a single species within its genus.
Reference(s): No. 1, 51
Updated:2021-09-26

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The revised taxonomy of the mollicutes

The revised taxonomy of mollicutes (mycoplasmas) has now been introduced on VetBact, which means that many of the species have been given new genus names or moved to another higher taxon. 

Published 2021-11-25. Read more...

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