Rare complication of measles ?
**Core Concept**
Measles is a highly contagious viral infection caused by the measles virus, which affects the respiratory system and the central nervous system. It is characterized by fever, cough, runny nose, and a characteristic rash.
**Why the Correct Answer is Right**
Subacute sclerosing panencephalitis (SSPE) is a rare but serious complication of measles, occurring in about 1 in 100,000 to 1 in 1 million cases. It is a progressive neurological disorder that affects the brain, leading to severe damage and eventually death. SSPE is thought to occur when the measles virus persists in the brain for years, leading to inflammation and scarring.
**Why Each Wrong Option is Incorrect**
**Option A:** Encephalitis is a common complication of measles, but it is not the same as SSPE.
**Option B:** Meningitis is another complication of measles, but it is not the rare complication being asked about.
**Option C:** Measles pneumonia is a serious complication, but it is not the rare neurological complication of SSPE.
**Clinical Pearl / High-Yield Fact**
SSPE typically occurs several years after the initial measles infection, often in children who were previously healthy. It is a rare but devastating complication that highlights the importance of measles vaccination.
**Correct Answer:** D. Subacute sclerosing panencephalitis (SSPE).