Entomological investigations on sporadic Japanese encephalitis sero-positivity in Tamil Nadu, India (original) (raw)

ENTOMON, 2020

Abstract

In India, Japanese Encephalitis (JE) continues to be a public health issue in some parts of our country. JE surveillance includes early reporting of clinical cases, sentinel sero-surveys and vector surveillance in the endemic areas. In the present study, JE longitudinal vector surveillance and epidemiological investigations were carried out for the first time during two consecutive years in the endemic district of Tamil Nadu. 22,538 mosquitoes were collected, species identified and screened for JE virus by RT-PCR. Predominant was Culex tritaeniorhynchus (60%) and followed by it Anopheles subpictus (23%), Culex quinquefasciatus (8%) and Culex gelidus (3%). It suggests that Culex tritaeniorhynchus may act as major vector and An. subpictus may act as secondary vector. Monsoon and post-monsoon seasons favour breeding of Cx. tritaeniorhynchus leading to vector abundance. Preferential resting sites for Cx. tritaeniorhynchus were pig and cattle shed. Although clinical cases have been repor...

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