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Am. J. Trop. Med. Hyg., 78(1), 2008, pp. 70-76
Copyright © 2008 by The American Society of Tropical Medicine and Hygiene

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Suppression of Dengue Transmission by Application of Integrated Vector Control Strategies at Sero-Positive GIS-Based Foci

Pattamaporn Kittayapong*, Sutee Yoksan, Uruyakorn Chansang, Chitti Chansang, AND Amaret Bhumiratana
Center of Excellence for Vectors and Vector-Borne Diseases and Department of Biology, Faculty of Science, Mahidol University at Salaya, Nakhonpathom, Thailand; Center for Vaccine Development, Institute of Science and Technology for Development, Mahidol University at Salaya, Nakhonpathom, Thailand; Department of Biotechnology, Faculty of Science, Mahidol University, Bangkok, Thailand

A serological survey of primary school children from six schools in Chachoengsao Province, Thailand, was performed at the end of the peak of dengue transmission. GIS analysis of sero-positive cases was carried out to determine transmission foci. Vector control implementation was conducted in the foci and also within 100 meters around the foci in the treated areas by community participation in collaboration with the local government. Vector control strategies included source reduction together with the use of screen covers, a combination of Bacillus thuringiensis subsp. israelensis and Mesocyclops thermocyclopoides, and lethal ovitraps. Implementation of vector control strategies in the foci was continued until the end of the rainy season. Vector control effectiveness was monitored using entomological, serological, and clinical parameters. Results showed a significant reduction of dengue vectors as well as a decrease in sero-positive children and clinical cases in treated areas when compared with untreated areas.

Received February 1, 2006. Accepted for publication May 25, 2007.

Acknowledgments: We are grateful to the officers of Plaeng Yao Hospital and the Local Public Health Office for their assistance in the serological surveys; the Local Administrative Office of Hua Sam Rong Subdistrict for their help in coordinating the source reduction/ clean-up campaign and organizing routine garbage pickup during implementation. The authors thank Mr. Tanong Aimmak for coordinating the overall project; Mr. Somboon Srimarat for collecting mosquitoes and GPS positioning of houses; and also people in the study area of Hua Sam Rong and Wang Yen Subdistricts, Plaeng Yao District, Chachoengsao Province for their good cooperation. The ethical approval of this study was granted by the Ethical Advisory Committee of the Ministry of Public Health of Thailand.

Financial support: This investigation received financial support from the UNICEF/UNDP/World Bank/WHO Special Programme for Tropical Diseases Research and Training (TDR/RCS/A00786) and the Mahidol University Research Grant (SCBI-47-T-217).

* Address correspondence to Pattamaporn Kittayapong, Center of Excellence for Vectors and Vector-Borne Diseases, Faculty of Science, Mahidol University at Salaya, Nakhonpathom 73170, Thailand. E-mail: grpkt{at}mahidol.ac.th

Authors’ addresses: Pattamaporn Kittayapong, Uruyakorn Chan-sang, and Chitti Chansang, Center of Excellence for Vectors and Vector-Borne Diseases, Faculty of Science, Mahidol University at Salaya, 25/25 Phutthamonthon 4 Road, Nakhonpathom 73170, Thailand, Tel: +662 201 5935, Fax: +662 201 5923, E-mail: grpkt{at}mahidol.ac.th. Sutee Yoksan, Center for Vaccine Development, Institute of Science and Technology for Development, Mahidol University at Salaya, 25/25 Phutthamonthon 4 Road, Nakhonpathom 73170, Thailand, Tel.: +662 441 0190, Fax: +662 441 0190, E-mail: grsys{at}mahidol.ac.th. Amaret Bhumiratana, Department of Biotechnology, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand, Tel.: +662 201 5010, Fax: +662 201 5923, E-mail: scabr{at}mahidol.ac.th.

Reprint requests: Pattamaporn Kittayapong, Center of Excellence for Vectors and Vector-Borne Diseases, Faculty of Science, Mahidol University at Salaya, 25/25 Phutthamonthon 4 Road, Nakhonpathom 73170, Thailand, Tel: +662 201 5935, Fax: +66 2201 5923, E-mail: grpkt{at}mahidol.ac.th






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