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Memórias do Instituto Oswaldo Cruz

Print version ISSN 0074-0276On-line version ISSN 1678-8060

Abstract

SAHU, Sudhansu Sekhar et al. Entomological investigation of Japanese encephalitis outbreak in Malkangiri district of Odisha state, India. Mem. Inst. Oswaldo Cruz [online]. 2018, vol.113, n.6, e170499.  Epub May 14, 2018. ISSN 0074-0276.  http://dx.doi.org/10.1590/0074-02760170499.

BACKGROUND

A severe outbreak of Japanese encephalitis (JE) and acute encephalitis syndrome (AES) with high case fatality was reported from Malkangiri district of Odisha state, India during September to November 2016 affecting 336 children with 103 deaths.

OBJECTIVES

The purpose of this study was to investigate the outbreak in the light of entomological determinants.

METHODS

Entomological investigation was carried out in 48 villages from four mostly affected Community Health Centres (CHCs) of Malkangiri district. Dusk collections of resting adults was done in villages from indoor and outdoor sites to record the density of mosquito species, including the known JE vectors, feeding behaviour, parity, dusk index and infection status with JE virus (JEV).

FINDINGS

The per man hour density and dusk index of JE vector species varied from 2.5 to 24.0 and 0.81 to 7.62, respectively in study villages. A total of 1136 mosquitoes belonging to six vector species were subjected to PCR and one pool of Culex vishnui was found to be positive for JEV.

CONCLUSION

The JE transmission in Malkangiri district was confirmed. Thorough screening of human blood samples of JE/AES suspected cases and JE vector mosquitoes for the presence of JEV during rainy season every year is recommended.

Keywords : Japanese encephalitis; outbreak; entomological investigation; Malkangiri; Odisha; India.

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