Identification of Francisella tularensis using real-time fluorescence polymerase chain reaction.

A Francisella tularensis-specific, TaqMan probe-based, real-time fluorescence polymerase chain reaction (PCR) assay required approximately 60 minutes and consistently achieved a sensitivity of < or = 10 fg of F. tularensis genomic DNA (five genome equivalents). Specificity testing against a genomic DNA cross-reaction panel comprised of 22 bacterial organisms representing closely related species, diverse genera, and human genomic DNA resulted in no false positives of significance. The assay was conducted on a field-deployable thermocycler, the R.A.P.I.D. ("Ruggedized" Advanced Pathogen Identification Device), a microbial identification system that can provide rapid and accurate identification F. tularensis.