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Swedish University of Agricultural Sciences

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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