Brucella species

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The page below is a sample from the LabCE course Preliminary Identification of the Primary Select Agents of Bioterrorism. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Brucella species

Clinical specimens where organism may be encountered:
  • Blood
  • Bone marrow
  • Tissue
Gram stain morphology:
  • Very small, gram-negative coccobacilli
  • Stains very faintly and tends to retain crystal violet, especially in blood cultures
  • May initially be identified as gram-positive
  • Organism is larger than F. tularensis
  • Individual cells are evident

Brucella species image courtesy of CDC