understood. However, while we're discussing Clostridium botulinum ...the bacteria (actually several strains thereof), the real danger is in the botulinum toxin. Botulinum toxin is a neurotoxin produced as a byproduct by the growing bacteria. It is highly toxic even in small amounts (VERY miniscule amounts are used in Botox though).
As for the bacteria themselves, we are all exposed to Clostridium botulinum on a daily basis... the soil, the food we eat, etc. So while we can tolerate the bacteria, we are all susceptible to the toxin produced by a growing population of the bacteria...even those getting regular Botox shots (for instance).
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...got YAK???