The symptoms of SSPE are initially pretty subtle like for example, mood changes, but eventually become severe and dramatic, and can include seizures, coma, and if left untreated, death.

SSPE的症状最初相当微妙，如情绪变化，而最终变得严重和激烈，其症状包括癫痫发作、昏迷，如果不加治疗将会死亡。