True statement regarding Japanese Encephalitis is
• 85% of cases of JE are reported in age below 15 years BUT JE IS INFREQUENT IN INFANCY: Vaccination not recommended below 6 months age infants (as also interference from maternal antibodies)
• Not all humans bitten by mosquitoes develop the disease: Ratio of JE overt disease to inapparent infection varies from 1:300 to 1:1000
• Endemicity of JE in India: 1-2 cases per village
Epidemic is declared if there are 2-3 cases in a village
70% of cases are reported from infants
Ratio of clinical apparent to non-apparent infections is 1:100
Mosquito bite is always associated with the disease