VetBact logo


Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology

Species/Subspecies: Borrelia anserina
Category: Motile
Etymology: Genus name: named after the French bacteriologist Amédée Borrel (1867-1936).
Species epithet: of geese.
Significance:Fowl spirochetosis, which is considered to be caused by Borrelia anserina, is an important disease in tropical and subtropical areas. The disease is common in Asia and the Middle East where the Argas ticks are found. Outbreaks occur sporadically in south-western USA. The organism has never been isolated from Swedish birds, because the tick vector (Argas spp.) is not present in Northern Europe.
  [Of minor importance]   
Type Strain: Not designated.
Macromorphology (smell):
Borrelia spp. have a planar flat-wave morphology. B. anserina is 0.2-0.3 x 8-20 µm in size with 5-8 waves. Has periplasmic flagella (endoflagella or axial filaments) and is very motile.
Gram +/Gram -:G- (but difficult to stain)
Metabolism: Microaerophilic
Spec. Char.:
Vector: Tick (Argas miniatus, A. persica and A. reflexus).
Disease:Fowl spirochetosis or avian borreliosis.
Hosts: Chickens, turkeys, pheasants, geese and ducks.
Clinical Picture: Cyanotic or pale comb and wattles, ruffled feathers, green droppings, inactivity and anorexia. Some of the diseased birds will die. Those that survive will gain life-long immunity.
Genome Sequence:
Acc-noStrainSize (bp)Genome
CP005829 BA2 0 904 790  

16S rRNA Seq.:
Acc-noStrainNumber of NTOperonSequence similarity
U42284 ES-1 1 523 1l + 1l% 

About 40 species have been described within genus Borrelia and the species that have been included in VetBact form two monophyletic clusters. See the phylogenetic tree )Fig. 208:4.
Comment:B. anserina is typ species for genus Borrelia.


New names of bacterial phyla

The taxonomic category phylum was previously not regulated by the International Code of Nomenclature of Prokaryotes (ICNP), but now this has changed and it was decided to revise the names of bacterial phyla. All phyla must be written in italics (which has been done on VetBact also before) and have the ending -ota.

Published 2023-03-01. Read more...
The taxonomy of chlamydias

Species within the family Chlamydiaceae were previously divided into two genera Chlamydia and Chlamydophila. However, the differences between these two genera were not that great and many research groups have not accepted this division. Therefore, the genus Chlamydophila has been returned to the genus Chlamydia and this change has now been incorporated in VetBact

Published 2023-03-15. Read more...

Recently Updated

Recent blog posts

Most recent comment

Swedish University of Agricultural Sciences