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WEBSITE OF THE STATE OF SOUTH DAKOTA DEPARTMENT OF HEALTH
Kim Malsam-Rysdon, Interim Secretary of Health

Brucella species — Colony Characteristics

Brucella is the most commonly reported agent of laboratory-associated infection. It is a virulent, highly infectious organism. Once this organism is suspected on the basis of clinical and/or laboratory information, do not perform additional testing. Send the isolate to the South Dakota State Laboratory for identification.

Sheep blood agar growth at 24 hours is very light. 24 hour growth
Colonies at 48 to 72 hours are punctate and nonhemolytic. 72 hour growth
MacConkey – some strains may grow slowly on this media.
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