Francisella tularensis

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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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Francisella tularensis

Any isolate with the following features should be immediately referred to your LRN reference laboratory:

  • Gram stain shows tiny, weak staining, gram-negative coccobacilli
  • Gray-white, opaque colonies on sheep blood agar (SBA) and chocolate (CHOC) agar a at 48 hours
  • Slow growth in broth (up to three weeks)
  • Oxidase negative
  • Urea negative