"The boy had contracted measles as a 7-month-old, when he was too young to be vaccinated.
Then in middle school, he started to develop troubling symptoms...
[A] pediatric neurologist finally suspected a condition called subacute sclerosing panencephalitis, or SSPE. It's a degenerative neurological condition that typically develops seven to 10 years after a measles infection. It is almost always fatal."
https://www.npr.org/sections/shots-health-news/2025/03/17/nx-s1-5328765/measles-outbreak-health-risk