Measles can hide in the brain for years, then come back
- Claim
- MEASLES CAN HIDE IN THE BRAIN
- Catch
- ONE PATIENT
- Verdict
- THE VACCINE PREVENTS IT
Subacute sclerosing panencephalitis (SSPE) is a rare, progressive brain disease caused by measles virus that persists in the brain after an apparently normal recovery. Symptoms typically begin years later, often around 7 to 10 years after infection, and the disease is almost always fatal; there is no cure. In a 2023 study in PLOS Pathogens, Mayo Clinic and CDC researchers sequenced measles virus from 15 brain regions of one person who had measles as a child and died of SSPE as an adult. The viral genome diversified as it replicated, and two genomes with a particular combination of mutations drove its spread from the frontal cortex, where it entered, to colonize the whole brain. The catch: this map comes from a single patient, and the team still plans to test how those mutations affect spread in brain cells and organoids. How common is SSPE? A California study estimated it at about 1 in 1,367 children who had measles before age 5, and 1 in 609 of those infected before 12 months, much higher than older estimates. Measles vaccination prevents measles and therefore SSPE. As of October 15, 2026, the CDC had confirmed 4,410 measles cases in the US this year.
SOURCES
- Yousaf, Cattaneo et al. (2023), "Brain tropism acquisition: The spatial dynamics and evolution of a measles virus collective infectious unit that drove lethal subacute sclerosing panencephalitis," PLOS Pathogens. DOI: 10.1371/journal.ppat.1011817
- Wendorf et al. (2017), "Subacute sclerosing panencephalitis: the devastating measles complication that might be more common than previously estimated," Clinical Infectious Diseases. DOI: 10.1093/cid/cix302
- CDC, Measles Cases and Outbreaks (updated October 15, 2026)
For information only, not medical advice. Ask your doctor or pharmacist to check your family's measles vaccination status.
