The child died yesterday at the BRD Medical College Hospital, health officials said today.
They said a total of 421 patients showing symptoms of encephalitis have been admitted to the hospital and adjoining district hospitals this year.
While some of the patients were suffering from Japanese Encephalitis (JE), most of them were suffering from Acute Encephalitis Syndrome (AES).
The JE spreads due to mosquito bites while AES spreads due to viruses present in contaminated water.