<i>C. botulinum</i> strains analyzed in this study, and genomic location of their <i>bont</i>/B and /A PCR-RFLP subtype genes.

1<p>CDC (Centers for Disease Control and Prevention, USA); ISS (Istituto Superiore di Sanità, Italy).</p>2<p>IB (infant botulism); FB (foodborne botulism); AB (animal botulism); uB (unknown botulism).</p>3<p>Bnp (non-proteolytic B); Bbv (bivalent B).</p>4<p>The size of the closest molecular standard bands are indicated.</p>5<p>Non-proteolytic <i>C. botulinum</i>.</p>6<p>n.d. = Not determined, because of DNA degradation.