It develops 6 months to 4 years after the primary<unk>  infection, which in most cases is a congenital<unk> . In children with congenital<unk>  infection the deficits remain stable; neurological deterioration after the first few years of life is not believed to occur. Progression of the disease can be divided into two stages: * 1st stage: Behavioural Changes * insidious onset * subtle changes in behaviour and declining school work * 2nd stage: Neurological Changes * seizures – sometimes myoclonic * cerebellar ataxia * spastic weakness * retinopathy, optic atrophy * frank dementia leading to coma * spasticity and brainstem involvement with death in 2–5 years
Progressive rubella panencephalitis
Postvaccinal encephalitis
Herpesviral encephalitis
Fungal meningitis
Herpesviral meningitis
Eastern equine encephalitis
Viral encephalitis
Granulomatous meningoencephalitis