Seven cultures referred to in our laboratories as unidentified gram-negative bacilli or Haemophilus species were identified as atypical strains of Francisella tularensis lacking a requirement for cysteine or enriched medium for growth. The use of cellular fatty acid composition analysis facilitated early recognition of this pathogen and prompt implementation of appropriate biosafety measures.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC263075PMC
http://dx.doi.org/10.1128/jcm.32.2.551-553.1994DOI Listing

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