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Brucella is a genus of Gram-negative bacteria. They are small (0.5-0.7 × 0.6-1.5 µm), non-motile, encapsulated coccobacilli. Slow-growing, Brucella species require complex media for isolation.
A true zoonotic-disease (i.e. no human-to-human transmission has been identified), specification is currently assigned via a ratio of two antigenic determinants. Transmission is via ingestion of infected food, direct contact with an infected animal, or inhalation of aerosols. Infectious exposure is between 10 - 100 organisms. Brucella infections primarily occur via occupational exposure (i.e. exposure to cattle, sheep, pigs), but some recent transmissions has been via raw bovine milk consumption.
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"Brucella"