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Veterinary bacteriology: information about important bacteria
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Species/Subspecies: Histophilus somni
Etymology: Genus name: tissue friend.
Species epithet: of sleep (refers to one of the disease conditions).
Significance:  [Important]   
Old 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):
Histophilus somni  
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.:
Hosts: Cattle, sheep, goats
Disease:Acute, often fatal, septicemic disease involving the cardiovascular, musculoskeletal, nervous or respiratory systems (bovine respiratory disease).
Clinical Picture:
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:
Histophilus somni  
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 other bacteria belonging to genus Haemophilus
Reference(s): No. 63
Updated:2020-06-10

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