FISH staining with a probe specific for <i>Francisella tularensis</i> in <i>Dermacentor reticulatus</i> oocytes after feeding on guinea pigs infected with <i>F</i>. <i>tularensis</i> subsp. <i>holarctica</i>.

<p>(A) Image obtained from light transmission; (B) Overlay image with blue signal for <i>F</i>. <i>tularensis</i> (23S rRNA probe for <i>F</i>. <i>tularensis</i> labelled with the fluorochrome Cy5) and red signal for universal eubacterial probe EUB338; (C) 23S rRNA probe for all <i>F</i>. <i>tularensis</i>; (D) universal eubacterial probe EUB338. Scale bar: 200 μm.