Which statement about botulism is incorrect?

Which statement about botulism is incorrect?

• A. Infant botulism results from ingestion of spores of Clostridium botulinum.
• B. Older children and adults usually get botulism from toxins produced by Clostridium botulinum.
• C. Botulism is a neurotoxin-mediated illness.
• D. Botulism is a respiratory illness caused by a coronavirus.

Answer: (D)

The principle being tested is understanding what causes botulism and how it typically arises in different age groups, as well as what the illness actually is. Botulism is a neurotoxin-mediated illness produced by Clostridium botulinum. In infants, the danger comes from ingesting spores that can colonize an immature gut and produce toxin there. In older children and adults, the typical scenario is exposure to preformed toxin in food, rather than toxin produced after spores germinate in the gut. The illness is characterized by neurotoxic effects—primarily descending flaccid paralysis due to inhibition of acetylcholine release at the neuromuscular junction—which can affect cranial nerves and respiratory muscles in severe cases. The statement that botulism is a respiratory illness caused by a coronavirus is not correct. Botulism is not a viral respiratory infection; it is a toxin-mediated neurologic illness, though severe paralysis can impair breathing.

The principle being tested is understanding what causes botulism and how it typically arises in different age groups, as well as what the illness actually is.

Botulism is a neurotoxin-mediated illness produced by Clostridium botulinum. In infants, the danger comes from ingesting spores that can colonize an immature gut and produce toxin there. In older children and adults, the typical scenario is exposure to preformed toxin in food, rather than toxin produced after spores germinate in the gut. The illness is characterized by neurotoxic effects—primarily descending flaccid paralysis due to inhibition of acetylcholine release at the neuromuscular junction—which can affect cranial nerves and respiratory muscles in severe cases.

The statement that botulism is a respiratory illness caused by a coronavirus is not correct. Botulism is not a viral respiratory infection; it is a toxin-mediated neurologic illness, though severe paralysis can impair breathing.