The Effect of Insecticide-Treated Mosquito Nets (ITMNs) on Japanese Encephalitis Virus Seroconversion in Pigs and Humans

Prafulla Dutta Regional Medical Research Centre, Indian Council of Medical Research, Division of Entomology and Filariasis, North East Region, Dibrugarh, Assam, India

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Siraj A. Khan Regional Medical Research Centre, Indian Council of Medical Research, Division of Entomology and Filariasis, North East Region, Dibrugarh, Assam, India

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Abdul M. Khan Regional Medical Research Centre, Indian Council of Medical Research, Division of Entomology and Filariasis, North East Region, Dibrugarh, Assam, India

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Jani Borah Regional Medical Research Centre, Indian Council of Medical Research, Division of Entomology and Filariasis, North East Region, Dibrugarh, Assam, India

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Chandra K. Sarmah Regional Medical Research Centre, Indian Council of Medical Research, Division of Entomology and Filariasis, North East Region, Dibrugarh, Assam, India

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Jagadish Mahanta Regional Medical Research Centre, Indian Council of Medical Research, Division of Entomology and Filariasis, North East Region, Dibrugarh, Assam, India

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The effect of insecticide-treated mosquito nets (ITMNs) on Japanese Encephalitis (JE) virus seroconversion in pigs and humans was studied in Assam, Northeast India. A sharp reduction of seroconversion rate in human and pig was found in treated localities after intervention. A marked reduction was achieved in humans (risk ratio [RR] = 0.28, 95% confidence interval [CI] = 0.16–0.49) and pigs (RR = 0.21, CI = 0.11–0.40) in the Kollolua locality where ITMNs were used on both humans and pigs compared with the other two area, Athabari and Rajmai, where ITMNs were covering only either humans or pigs. Monitoring of the mosquito population in and around cattle sheds during dusk revealed no significant decline (P > 0.05) of vector density during the post-intervention period in study localities. In spite of the high preponderance of potential JE vector outdoors during the post-intervention period, an encouraging line of defense against circulation of JE virus through the use of ITMNs can be achieved in endemic areas.

Author Notes

*Address correspondence to Prafulla Dutta, Regional Medical Research Centre, Indian Council of Medical Research, Division of Entomology and Filariasis, North East Region, Post Box No. 105, Pin 786001, Dibrugarh, Assam, India. E-mail: duttaprafulla@yahoo.com

Financial support: The project was funded by the Indian Council of Medical Research, New Delhi, India.

Authors' addresses: Prafulla Dutta, Siraj A. Khan, Abdul M. Khan, Jani Borah, Chandra K. Sarmah, and Jagadish Mahanta, Regional Medical Research Centre, Indian Council of Medical Research, North East Region, Dibrugarh, Assam, India, E-mails: duttaprafulla@yahoo.com, sirajkhanicmr@gmail.com, abdulmaboodkhan@gmail.com, drjaniborah@gmail.com, icmrrcdi@ren.nic.in, and icmrrcdi@hub.nic.in.

Reprint requests: Prafulla Dutta, Regional Medical Research Centre, Indian Council of Medical Research, North East Region, Post Box No. 105, Pin 786001, Dibrugarh, Assam, India, E-mail: duttaprafulla@yahoo.com.

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