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Japanese encephalitis in India: risk of an epidemic in the National Capital Region.

Japanese encephalitis (JE) is a mosquitoborne viral disease that is the primary cause of acute encephalitis syndrome in India. This virus mainly infects the central nervous system and causes massive inflammation which, if left unchecked, may prove fatal. Survivors often suffer from mild to severe neuropsychiatric sequelae. JE is a major cause of death in many parts of India and there is a possibility of it spreading into the National Capital Region from highly endemic neighbouring states. Fourteen cases of JE were reported in Delhi in 2011 compared with none in the previous 4 years from 2007 to 2010. Unless immediate preventive measures are taken this trend could continue and the disease could spread with increasing prevalence.