(CNN) — A school-age child in Los Angeles County who had measles as an infant has died of a rare complication, the county health department said Thursday.

The child was infected before they were eligible to receive the measles vaccine, the agency says; the first vaccination is recommended between 12 months and 15 months of age, followed by a second dose between ages 4 and 6.

They recovered from that infection but developed a condition called subacute sclerosing panenecephalitis, which affects about 1 in 10,000 unvaccinated people who get measles overall but up to 1 in 600 of those who catch the virus in infancy.

SSPE, as the complication is also known, develops years after measles infection and can cause changes in personality or behavior, problems with speech and motor functions, and e

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