True statement regarding Japanese Encephalitis is

A. Epidemic is declared if there are 2-3 cases in a village

B. 70% of cases are reported from infants

C. Ratio of clinical apparent to non-apparent infections is 1:100

D. Mosquito bite is always associated with the disease

Correct Answer: Epidemic is declared if there are 2-3 cases in a village

Description: • 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

Category: Social & Preventive Medicine

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