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Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology
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Species/Subspecies: Fusobacterium necrophorum subsp. necrophorum
Etymology: Genus name: small spindle shaped rod.
Species epithet: necrosis producing.
Subspecies epithet: see Species epithet.
Significance:  [Very important]   
Old Species Name(s):Bacteroides necrophorus, Fusobacterium necrophorum (Biotyp A)
Taxonomy:
Phylum
Fusobacteria
Class
Fusobacteriia
Order
Fusobacteriales
Family
Fusobacteriaceae 
Genus
Fusobacterium
Type Strain: VPI 2891 = ATCC 25286 = CCUG 9994.
Macromorphology (smell):
Fusobacterium necrophorum  
Small cream-colored metal shiny colonies. Many strains produce a thin hemolysis zone on blood agar. Smells like rancid butter (or boiled cabbage). Colonies fluoresce in neon green under long-wave UV-light.
Micromorphology: Coccoid rods to thin, needle-shaped filaments. Non-motile.
Gram +/Gram -:
Fusobacterium necrophorum  
G-
Metabolism: Strictly anaerobic
Catalase/Oxidase:-/-
Other Enzymes: Esculinase -, lipase -, Tryptophanase + (= indole +).
Fermentation of carbohydrates: Butyric acid is produced by fermentation.
Spec. Char.: Temperature optimum: 37°C.
Hosts: Cattle, sheep (and humans)
Disease:Liver abscesses and interdigital necrobacillos (foot rot etc). This bacterium is regarded as a secondary pathogen in ovine foot rot.
Clinical Picture:
Virulence Factors: Produces a leucotoxin directed against neutrophils and has LPS.
Genome Sequence:
Acc-noStrainSize (bp)Genome
Not reported    

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AJ867039 ATCC 25286 1455  

Taxonomy/phylogeny:
Fusobacterium necrophorum  
Within the genus Fusobacteria, 14 species have been described and 2 of these are divided into 7 sub-species. Fusobacteria are related to genus Streptobacillus, but the latter belongs to another family, namely Leptotrichiaceae.
Comment:Can convert lactic acid to propionic acid.
Reference(s): No. 24
Updated:2020-09-30

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