SSPE is seen in?
**Core Concept**
Subacute sclerosing panencephalitis (SSPE) is a rare, chronic, and progressive neurological disorder caused by a persistent measles virus infection in the central nervous system. It primarily affects children and young adults who have a history of measles infection.
**Why the Correct Answer is Right**
SSPE is characterized by the reactivation of a latent measles virus infection, which leads to the production of defective viral particles that are unable to infect new cells but can still cause a severe inflammatory response in the brain. The virus primarily targets the oligodendrocytes, leading to demyelination and subsequent neurological symptoms. The correct answer is a specific demographic or group affected by SSPE.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because SSPE is not typically seen in adults who have not had measles. While adults can be infected with measles, SSPE is primarily a concern in children and young adults who have a history of measles.
**Option B:** Incorrect because SSPE is not a result of a congenital infection. While congenital infections can cause neurological disorders, SSPE is a post-infectious complication of measles.
**Option C:** Incorrect because SSPE is not a manifestation of a viral encephalitis caused by a different virus. While viral encephalitis can cause neurological symptoms, SSPE is a specific complication of measles virus infection.
**Clinical Pearl / High-Yield Fact**
SSPE often presents with a triad of symptoms: personality changes, seizures, and myoclonus, which can progress to a vegetative state or death if left untreated.
**Correct Answer: C. Children and young adults with a history of measles.**