Retrospective analysis of epidemiological investigation of Japanese encephalitis outbreak occurred in Rourkela, Orissa, India.

There was an outbreak of Japanese encephalitis (JE) during July/August of 1993 in Rourkela City of Orissa, India. Among the serum samples, 40% of the sera showed antibodies against JE, while 17% of the sera showed recent infection to dengue virus. As many as 15 species of mosquitos were encountered in and around the affected areas. Species like Culex tritaeniorhynchus, Cx, vishnui, Cx. pseudovishnui and Cx. bitaeniorhynchus constituted 19% of the total collections. The above species were resistant to DDT and dieldrin, but susceptible to malathion.