Food poisoning after 1-5 hours of consumption of ice cream, causative organism is
**Core Concept**
Food poisoning within 1-5 hours of consuming ice cream is typically caused by bacterial toxins that are highly resistant to stomach acid and can be ingested in large numbers. This scenario is often associated with contaminated dairy products.
**Why the Correct Answer is Right**
The causative organism in this scenario is likely *Bacillus cereus*, a gram-positive, rod-shaped bacterium that can produce two types of toxins: emetic and diarrheal. The emetic toxin is responsible for the vomiting type of food poisoning, while the diarrheal toxin causes watery diarrhea. *B. cereus* can grow rapidly in dairy products like ice cream, especially when stored at room temperature, allowing it to produce toxins that can cause illness within a short time frame.
**Why Each Wrong Option is Incorrect**
* **Option A:** This is incorrect because *Staphylococcus aureus* typically causes food poisoning after a longer incubation period (6-24 hours) and is more commonly associated with meat, poultry, and dairy products that have been improperly stored at room temperature.
* **Option B:** This is incorrect because *Clostridium perfringens* typically causes food poisoning after a longer incubation period (8-12 hours) and is more commonly associated with meat, poultry, and gravies that have been improperly stored at room temperature.
* **Option C:** This is incorrect because *Salmonella* typically causes food poisoning after a longer incubation period (6-48 hours) and is more commonly associated with contaminated poultry, eggs, and other animal products.
**Clinical Pearl / High-Yield Fact**
* *B. cereus* food poisoning can be prevented by storing dairy products at a consistent refrigerated temperature below 40°F (4°C) and by consuming them within a few days of opening.
**Correct Answer: D. Bacillus cereus. Bacillus cereus**