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Brucella species image courtesy of CDC

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