This is a phase III multi-centre randomised, double blind, placebo controlled trial to assess the role of intravenous immunoglobulin in the treatment of children with encephalitis. The primary objective is to find out whether early use of IVIG treatment improves neurological outcomes of children with encephalitis. 308 children with encephalitis, aged 6 weeks to 16 years will be recruited in 30 hospitals in the United Kingdom. Participants will be randomised to receive two doses of IVIG or matching placebo in addition to other standard treatments, within the first five days of hospital admission. Each participant will be followed up for 12 months. During this period, information on clinical, radiological and laboratory investigations will be collected. Neurological outcomes will be assessed by the use of questionnaires at 6 and 12 months, and a neuropsychological assessment at 12 months.
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Good recovery", defined by GOS-E-Peds score 2 or lower at 12 months post randomisation
Timeframe: Up to 12 Months after randomization