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Brucella microti

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A gram-negative nonmotile non-spore forming and slightly elongated bacterium involved in worldwide zoonotic infection.


Brucella microti has a sized of about 0.5-0.8 micrometer in diameter and 0.6-1.4 micrometer in length arranged individually or in an irregular clusters that able to grow at temperature ranging from 25’C-42’C. In culture media it has a smooth and slightly concaves with continuous edges with brown shade colonies.

Brucella microti has a unique DNA sequence with 23S ribosomal variation, the reason why this bacterium has the capability to enhance its growth compared to other Brucella species. It is oxidase, urease and catalase positive which is capable to reduce nitrate to nitrite but cannot produce H2S gas.

Brucella microti has been first isolated from the liver of common vole and recently found in the soil which is typical environment for Brucella species wherein outside the mammalian host may cause pathogenic and potentially lead to reemergence of worldwide zoonotic infectious disease thus its ability to survive outside host cells can be an agent as a primary reservoir for infection. It is implicated in brucellosis in human manifested by fever, severe fatigue, sweating and muscular pain.

Scientific classification:

 Kingdom: Bacteria
 Phylum: Proteobacteria
 Class: Alpha Proteobacteria
 Order: Rhizobiales
 Family: Brucellaceae
 Genus: Brucella
 Species: Brucella microti 

See also:

• Bacteria

• Zoonotic disease