“…The natural and principal habitat of C. botulinum is soil and marine and freshwater sediments. The prevalence has been studied on many continents including Europe (Knock, 1952; Creti et al ., 1990; Sandler et al ., 1993; Williamson et al ., 1999; Dhaked et al ., 2002; Zechmeister et al ., 2005; for more references see Lúquez et al ., 2005) and data on the geographical distribution of the toxin types are available. Clostridium botulinum is considered to be ubiquitously distributed in soil.…”