Which Bacillus cereus toxin is heat stable?

Which Bacillus cereus toxin is heat stable?

• A. Diarrheal toxin
• B. Both toxins
• C. Emetic toxin
• D. Neither toxin

Answer: (C)

Two Bacillus cereus toxins behave very differently under heat. The one that causes vomiting is cereulide, the emetic toxin, and it is heat-stable. That means it can survive cooking and heating processes and remain active in food, so people may still vomit after eating dishes that were properly cooked. The diarrheal toxins, on the other hand, are heat-labile proteins; they can be inactivated by heating, so cooking tends to reduce their risk. This contrast explains why emetic illness can occur even after heating, while diarrheal illness is more likely to be mitigated by proper cooking.

Two Bacillus cereus toxins behave very differently under heat. The one that causes vomiting is cereulide, the emetic toxin, and it is heat-stable. That means it can survive cooking and heating processes and remain active in food, so people may still vomit after eating dishes that were properly cooked. The diarrheal toxins, on the other hand, are heat-labile proteins; they can be inactivated by heating, so cooking tends to reduce their risk. This contrast explains why emetic illness can occur even after heating, while diarrheal illness is more likely to be mitigated by proper cooking.