Most Probable cause of food poisoning in a child who has eaten Ice Cream 16-18 hrs earlier is ?
**Core Concept**
The question is testing the student's knowledge of the incubation periods and common causes of food poisoning, specifically in the context of a child who consumed ice cream 16-18 hours earlier. This requires understanding of the typical incubation periods of various foodborne pathogens.
**Why the Correct Answer is Right**
The most likely cause of food poisoning in this scenario is Salmonella, which has an incubation period of 12-72 hours. Salmonella is commonly found in contaminated dairy products, including ice cream. The bacteria can cause symptoms such as diarrhea, abdominal cramps, fever, and vomiting. The long incubation period of Salmonella matches the timeframe provided in the question.
**Why Each Wrong Option is Incorrect**
**Option A:** Campylobacter has a shorter incubation period of 2-5 days, which is less likely given the 16-18 hour timeframe.
**Option B:** Staphylococcus aureus has a shorter incubation period of 1-6 hours, which is too rapid given the symptoms have not appeared yet.
**Option C:** Vibrio cholerae has a shorter incubation period of 1-5 days, which is less likely given the specific context of ice cream consumption.
**Clinical Pearl / High-Yield Fact**
Remember that Salmonella is a common cause of food poisoning, especially in children, and often associated with dairy products, eggs, and undercooked poultry. The long incubation period of 12-72 hours is a key differentiator in diagnosing foodborne illnesses.
**Correct Answer: D. Salmonella**