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  • Title: Discrimination between Francisella tularensis and Francisella-like endosymbionts when screening ticks by PCR.
    Author: Kugeler KJ, Gurfield N, Creek JG, Mahoney KS, Versage JL, Petersen JM.
    Journal: Appl Environ Microbiol; 2005 Nov; 71(11):7594-7. PubMed ID: 16269811.
    Abstract:
    The presence of Francisella-like endosymbionts in tick species known to transmit tularemia poses a potential diagnostic problem for laboratories that screen tick samples by PCR for Francisella tularensis. Tick samples initially considered positive for F. tularensis based on standard 16S rRNA gene PCR were found to be positive only for Francisella-like endosymbionts using a multitarget F. tularensis TaqMan assay (ISFtu2, tul4, and iglC) and 16S rRNA gene sequencing. Specificity of PCR-based diagnostics for F. tularensis should be carefully evaluated with appropriate specimen types prior to diagnostic use.
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