Koplik’s spots are seen in: September 2008
**Core Concept**
Koplik's spots are a clinical sign associated with the early stage of measles infection, characterized by the appearance of small, white or bluish-white lesions on the buccal mucosa, specifically on the inner surface of the cheeks.
**Why the Correct Answer is Right**
Koplik's spots are a result of the measles virus infection, which causes an inflammatory response in the buccal mucosa. The spots are thought to be a result of the aggregation of viral particles and the host's immune response, leading to the formation of small, white lesions. The presence of Koplik's spots is an important diagnostic clue for measles, especially in the early stages of the disease.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because Koplik's spots are not associated with rubella infection, which has a different clinical presentation.
**Option B:** Incorrect because Stevens-Johnson syndrome is a severe skin and mucous membrane disorder, but it is not characterized by the specific appearance of Koplik's spots.
**Option C:** Incorrect because Hand, foot, and mouth disease is a viral infection that affects children, but it is not associated with the development of Koplik's spots.
**Option D:** Incorrect because Parotitis is an inflammation of the parotid gland, but it is not directly related to the appearance of Koplik's spots.
**Clinical Pearl / High-Yield Fact**
Koplik's spots are a classic sign of measles infection, and their presence can help diagnose the disease even in the absence of the characteristic rash.
**Correct Answer: C. Hand, foot, and mouth disease is a viral infection that affects children, but it is not associated with the development of Koplik's spots.**