The incidence of<unk> .<unk>  encephalitis is approximately 192 per 100,000 individuals worldwide. The majority of<unk> .<unk>  encephalitis cases are reported in the United<unk> ates. In the United<unk> ates, the annual number of reported<unk> .<unk>  encephalitis cases reported fluctuate widely, as a result of periodic epidemics.<unk> .<unk>  encephalitis infection is thought to confer lifelong immunity against reinfection. The case fatality rate of<unk> .<unk>  encephalitis ranges between 5-30%, with higher rates among the elderly, worldwide.<unk> .<unk>  encephalitis affects men and women equally. There is no racial predilection to the development of<unk> .<unk>  encephalitis. Patients of all age groups may develop<unk> .<unk>  encephalitis.
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