Which characteristics are associated with Clostridium botulinum?

• A. Heat resistant spores, heat sensitive toxin, canned foods, paralysis
• B. Grows in the cold
• C. Requires high acidity
• D. Is a virus

Answer: (A)

Clostridium botulinum is a bacterium that forms spores which are highly heat-resistant, enabling them to survive improper cooking. In an anaerobic, low-acid environment such as improperly canned foods, these spores can germinate and produce botulinum toxin, a toxin that is heat-sensitive and can be inactivated by adequate heating. This combination—heat-resistant spores, a toxin destroyed by heat, canned foods as a common vehicle, and the toxin causing paralysis—fits the risk pattern for botulism. The other statements don’t fit: it isn’t primarily associated with growing in the cold, it does not require high acidity (it grows in low-acid conditions), and it is a bacterium, not a virus.