Characteristic of bacilus cereus food poisoning is –
**Core Concept**
Bacillus cereus food poisoning is a type of foodborne illness caused by the ingestion of spores of the bacterium Bacillus cereus. This bacterium can produce toxins that lead to vomiting and diarrhea. The pathogenesis involves the germination of spores into vegetative cells, which then produce toxins.
**Why the Correct Answer is Right**
The characteristic feature of Bacillus cereus food poisoning is the rapid onset of vomiting, often within 1-5 hours after consumption of contaminated food. This is due to the emetic toxin, which is produced by the bacterium and causes intense vomiting. The toxin is heat-stable and can survive cooking, making it a significant public health concern. The emetic toxin is produced by the bacterium when it is growing in a food environment with high pH and temperature.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Bacillus cereus food poisoning is not primarily characterized by diarrhea, unlike other types of food poisoning such as Shigella or E. coli infections.
**Option B:** This option is incorrect because Bacillus cereus food poisoning does not typically present with fever, unlike other bacterial infections such as typhoid or meningitis.
**Option C:** This option is incorrect because Bacillus cereus food poisoning is not typically associated with blood in stool, unlike other gastrointestinal infections such as amoebiasis.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that Bacillus cereus food poisoning can be caused by foods that have been stored at room temperature for an extended period, such as rice, pasta, or other starchy foods. These foods can provide an ideal environment for the growth of Bacillus cereus.
**Correct Answer:** D.