VetBact
VetBact logo

VetBact

Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Histophilus somni
Etymology: Genus name: tissue friend.
Species epithet: of sleep (refers to one of the disease conditions).
Significance:  [Important]   
Alternative Species Name(s):Haemophilus agni, Histophilus ovis, Haemophilus somnus, Haemophilus somnifer
Taxonomy:
Phylum
Proteobacteria
Class
Gammaproteobacteria
Order
Pasteurellales
Family
Pasteurellaceae 
Genus
Histophilus
Type Strain: 8025 = ATCC 43625 = CCUG 36157.
Macromorphology (smell):
 
Some strains are haemolytic. Forms small colonies (0.2-0.5 mm in diameter), which contain a yellow pigment.
Micromorphology: Small nonmotile rods
Gram +/Gram -:G-
Metabolism: Facultatively anaerobic
Catalase/Oxidase:-/+
Other Enzymes: Esculinase -, tryptophanase (+), urease -.
Fermentation of carbohydrates:
D-glucoselactosemaltoseL-rhamnosesucrose
??+--
L-arabinosecellobioseD-mannitolsalicintrehalose
v???+
glycerolinulinraffinoseD-sorbitolstarch
---??
Other carbohydrates: dulcitol V, D-galactose V, inositol V, melezitose -, melibiose -, xylitol ?
Spec. Char.:
Disease:
 
¨
HostsDiseaseClinical picture
Cattle (sheep, goat)Bronchopneumonia, Thrombo/TEME, with sepsisBronchopneumonia in calves the most common manifestation. Thromboembolic meningoencephalitis myocarditis, sepsis, ataxi, convulsions, blindness and sudden death.
Genome Sequence:
Acc-noStrainSize (bp)GenomeRef.
NC_008309 129PT 2 007 700 1c + 1c Nr 90

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AF549387 (T) 1361 

Taxonomy/phylogeny:
 
Only one species have been described within genus Histophilus, which is relatively close to Nicoletella semolina, which also is a single species within its genus.
Comment:X- and V-factor are not requirements for growth in contrast to bacteria belonging to the closely related genus Haemophilus.
Reference(s): No. 63
Updated:2021-09-26

News

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...

Recently Updated

Recent blog posts


Swedish University of Agricultural Sciences