Which statement is not characteristic of Clostridium botulinum?

Which statement is not characteristic of Clostridium botulinum?

• A. Oval spores located terminally
• B. Infant botulism is the most common clinical form.
• C. Pathogenicity is related to a potent neuro toxin.
• D. Of the seven toxogenic types, types A, B, E, and F are associated with human botulism.

Answer: (A)

Spore position is the key idea here. Clostridium botulinum forms oval endospores that are subterminal (toward one end but not at the tip), so stating that spores are terminal is not characteristic of this species. This helps distinguish it from organisms like C. tetani, which commonly has terminal spores giving a drumstick appearance. The other statements reflect true features: C. botulinum produces a highly potent neurotoxin responsible for botulism; infant botulism is indeed the most common clinical form; and among the toxigenic types, A, B, E, and F are the ones associated with human botulism.

Spore position is the key idea here. Clostridium botulinum forms oval endospores that are subterminal (toward one end but not at the tip), so stating that spores are terminal is not characteristic of this species. This helps distinguish it from organisms like C. tetani, which commonly has terminal spores giving a drumstick appearance. The other statements reflect true features: C. botulinum produces a highly potent neurotoxin responsible for botulism; infant botulism is indeed the most common clinical form; and among the toxigenic types, A, B, E, and F are the ones associated with human botulism.