What causes illness in botulism?

What causes illness in botulism?

• A. The toxin produced by the bacteria
• B. The bacteria's colonization of the intestine without toxin
• C. Allergen reaction to spores
• D. Toxins produced by Bacillus cereus

Answer: (B)

Botulism illness is caused by a toxin, not by the bacteria themselves simply being present. The botulinum toxin, produced by Clostridium botulinum, is a potent neurotoxin that blocks the release of acetylcholine at neuromuscular junctions. That interruption prevents muscle contraction, leading to the characteristic flaccid paralysis and potential respiratory failure. In many cases, people develop illness after ingesting preformed toxin in contaminated food. In infant botulism, spores are ingested and can colonize the gut, producing toxin there; the outcome is the same toxin-mediated disease. Wound botulism involves toxin produced in a contaminated wound. So the illness arises from the toxin acting on nerve signals, not from the bacteria merely colonizing the intestine without producing toxin, an allergen reaction to spores, or toxins from other organisms like Bacillus cereus.

Botulism illness is caused by a toxin, not by the bacteria themselves simply being present. The botulinum toxin, produced by Clostridium botulinum, is a potent neurotoxin that blocks the release of acetylcholine at neuromuscular junctions. That interruption prevents muscle contraction, leading to the characteristic flaccid paralysis and potential respiratory failure.

In many cases, people develop illness after ingesting preformed toxin in contaminated food. In infant botulism, spores are ingested and can colonize the gut, producing toxin there; the outcome is the same toxin-mediated disease. Wound botulism involves toxin produced in a contaminated wound. So the illness arises from the toxin acting on nerve signals, not from the bacteria merely colonizing the intestine without producing toxin, an allergen reaction to spores, or toxins from other organisms like Bacillus cereus.