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Veterinary bacteriology: information about important bacteria
Veterinary bacteriology

Species/Subspecies: Brucella abortus
Categories: Zoonotic; notifiable diseases and bacteria
Etymology: Genus name: named after Sir David Bruce, who first identified the organism, which causes brucellosis.
Species epithet: which causes abortion.
Significance:  [Very important]   
Alternative Species Name(s):Brucella melitensis biovar Abortus
Type Strain: 544 = ATCC 23448 = NCTC 10093.
Macromorphology (smell): Pale honey coloured transparant colonies, which do not give hemolysis on blood agar.
Micromorphology: Non-motile small coccoid rod (0.6 x 0.6-1.5 µm).
Gram +/Gram -:G-
Metabolism: Aerobic
Other Enzymes: Urease +
Fermentation of carbohydrates: Most Brucella spp. do not produce acid by fermentation of carbohydrates.
Spec. Char.:
Disease:Brucellosis, which is a zoonosis.
Hosts: Ruminants, primarely cattle, but also horse, dog and pig and humans.
Clinical Picture: Abortion etc.
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_007618 and NC_007624 2308 3 278 307 (2c + ?) 
Krom. I (2 121 359 bp) resp. krom II (1 156 948 bp).

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AY513559 2002034574 1 412 
Två rRNA-gener i krom. I och en i krom. II.

Eleven 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.
Legislation: Brucella abortus belongs to category B as a potential bioterrorism agent according to NIAID.
Comment:May penetrate intact skin. Brucellosis is notifiable in Sweden and is governed by the epizootic diseases act.
Link: Epiwebb - om epizootisjukdomar [in Swedish]


New families introduced within the order Enterobacterales
Phylogenetic tree for the order <i>Enterobacteriales</i>.

The order Enterobacterales (formerly called Enterobacteriales) previously consisted of bacteria with different properties and phylogenetically, these bacteria were far apart. In order for the taxonomy to be more in line with phylogeny, some of these bacteria have, therefore, been sorted into 6 new families.

Published 2022-04-13. Read more...

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