Characteristic of Bacillus cereus food poisoning is:
**Core Concept**
Bacillus cereus food poisoning is a type of foodborne illness caused by the ingestion of spores of Bacillus cereus, a gram-positive, rod-shaped bacterium. The spores can germinate into vegetative cells in the presence of nutrients and moisture, leading to the production of toxins.
**Why the Correct Answer is Right**
Bacillus cereus food poisoning is characterized by the production of two main toxins: cereulide and hemolysin BL. Cereulide is a heat-stable toxin that causes vomiting, while hemolysin BL is a hemolytic toxin that causes diarrhea. The toxin production is often associated with the consumption of starchy or carbohydrate-rich foods, such as rice, pasta, or baked goods, that have been contaminated with the spores.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Bacillus cereus food poisoning is not typically associated with the consumption of raw or undercooked meat.
**Option B:** This option is incorrect because Staphylococcus aureus food poisoning is caused by the ingestion of pre-formed toxins produced by Staphylococcus aureus, whereas Bacillus cereus food poisoning involves the production of toxins by the bacteria in the gastrointestinal tract.
**Option C:** This option is incorrect because Salmonella Typhi is a bacterium that causes typhoid fever, a systemic infection that is not typically associated with the consumption of contaminated food.
**Clinical Pearl / High-Yield Fact**
Bacillus cereus food poisoning can be prevented by proper food handling and storage, including reheating cooked foods to an internal temperature of at least 165°F (74°C) to kill the spores.
**Correct Answer: D.** Bacillus cereus food poisoning is characterized by the production of cereulide and hemolysin BL toxins.