PFGE and Southern blot hybridization of undigested bacterial DNA from the different <i>C. botulinum</i> strains and outbreak isolates to identify <i>boNT</i> gene location.

<p>(A and C) undigested PFGE of isolated DNA (B) hybridization using a <i>boNT</i>/A probe (D) hybridization results with the <i>boNT</i>/B probe.</p>