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Veterinary bacteriology: information about important bacteria
Veterinary bacteriology

Species/Subspecies: Brucella canis
Category: Zoonotic
Etymology: Genus name: named after Sir David Bruce, who first identified the organism, which causes brucellosis.
Species epithet: of dog.
Significance:  [Important]   
Alternative Species Name(s):Brucella melitensis biovar Canis
Type Strain: RM6/66 = ATCC 23365 = NCTC 10854
Macromorphology (smell):
Pale honey coloured transparant colonies, which do not give hemolysis on blood agar.
Micromorphology: Non-motile coccus or short rod
Gram +/Gram -:
Metabolism: Aerobic
Other Enzymes: Tryptophanase -, Urease +
Biochemical Tests: H2S -, Voges-Proskauer -
Fermentation of carbohydrates: Most Brucella spp. do not produce acid by fermentation of carbohydrates.
Spec. Char.:
HostsDiseaseClinical picture
DogsBrucellosisAbortion in the last weeks of gestation, stilborn puppies, decreased fertility. Epididymitis and infertility in male dogs.
Can also cause symptoms outside the reproductive organs such as lymphadenitis, discospondylitis and uveitis
Asymptomatic carriers occur
HumansBrucellosisUndulant fever, mostly mild symptoms
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_010103 and NC_010104 ATCC 23365T 3 312 769 2c + 0 
Chrom. I (2 105 969 bp) and chrom. II (1 206 800 bp), respectively.

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
L37584 (T) 1 418 
Two rRNA genes in chrom. I and one in chrom. II.

Twenty-five species have been described within genus Brucella and this genus is closely related to genus Bartonella. From a phylogenetic point of view, B. abortus, B. canis, B. ceti, B. melitensis, B. neotome, B. ovis, B. pinnipedialis and B. suis represent the same species (B. melitensis), but due to different host specificities, they have been affiliated with different species.


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...

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