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Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Francisella tularensis subsp. holarctica
Categories: Zoonotic; notifiable diseases and bacteria
Etymology: Genus name: named after the American bacteriologist Edward Francis, who has studied tularemia.
Species epithet: refers to Tulare county in California, where the disease was first described in rodents in year 1912.
Subspecies epithet: may be found in all arctic regions.
Significance:Is predominantly found in Asia and Europe, but occasionally also in North America. This subspecies is less virulent than subsp. tularensis.
  [Very important]   
Taxonomy:
Phylum
Proteobacteria
Class
Gammaproteobacteria
Order
Thiotrichales
Family
Francisellaceae 
Genus
Francisella
Type Strain: GIEM 503.
Macromorphology (smell):
Micromorphology: Coccoid or short nonmotile rods.
Gram +/Gram -:G-
Metabolism: Strict aerobic
Catalase/Oxidase:+/-
Other Enzymes: Tryptophanase - (= indole -), ureas -.
Spec. Char.: Facultatively intracellular. May penetrate intact skin.
Vector: Mosquitoes and ticks
Disease:A mild form of tularemia, which is a zoonosis
Hosts: Humans etc.
Clinical Picture:
Virulence Factors: The capsule can be a virulence factor.
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_007880 LVS 1 895 994 1c + 0 

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AJ698864 FSC 090 1 465 

Taxonomy/phylogeny:
 
Six species have been described within genus Francisella and this genus is related to Coxiella spp. and Legionella spp.
Legislation: Tularemia is notifyable in Sweden. Francisella tularensis belongs to category A as a potential bioterrorism agent according to NIAID.
Comment:Common in Sweden. The subspecies holarctica is less virulent than the subspecies tularensis.
Reference(s): No. 25
Updated:2020-10-28

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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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