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Evaluation of a Sticky Trap for Collecting Aedes (Stegomyia) Adults in a Dengue-endemic Area in Thailand

Development of new operational techniques for collection and monitoring of adult Stegomyia mosquitoes is considered a pressing need for surveillance and prevention of arboviruses. Here we report the results from a trial carried out in 2 dengue-endemic villages in Thailand to compare the ability to collect Aedes adults of a sticky trap versus a CDC backpack aspirator, which has been used routinely at the study area for entomological/epidemiological surveys. Our comparison was based on a comparable sampling effort required to carry out collections with 2 approaches. Over 19,000 specimens were collected, ~90% of which were Culex spp. Sticky traps collected significantly more Aedes aegypti and Aedes albopictus females than did backpack aspirators when located outdoors. The percentage of positive sticky-trap catches was double for Ae. aegypti and almost 20 times higher for Ae. albopictus. Operational benefits of the sticky trap are discussed within the context of the results obtained.

Received October 19, 2007. Accepted for publication February 15, 2008.

Acknowledgments: The authors thank AMA-DISINFESTAZIONI s.r.l. for financial and logistic support and Prof. Gianfranco Tarsitani for support and encouragement. The technical staff of the AFRIMS Entomology Laboratory in Kamphaeng Phet, Thailand, is acknowledged for its great help in the field. The authors thank the residents of the Thai villages for allowing them to inspect their houses.

^* Address correspondence to Alessandra della Torre, Dipartimento di Scienze di Sanità Pubblica, Sezione di Parassitologia, Università "La Sapienza," Piazzale Aldo Moro, 5, 00185 Rome, Italy. E-mail: ale.dellatorre{at}uniroma1.it

Authors’ addresses: Luca Facchinelli, Laura Valerio, and Alessandra della Torre, Dipartimento di Scienze di Sanità Pubblica, Sezione di Parassitologia, Università "La Sapienza", Piazzale Aldo Moro, 5, 00185 Rome, Italy, Tel: 39-06-49694268, Fax: 39-06-49694268, E-mails: e.facchinelli{at}ucdavis.edu, laura.valerio{at}uniroma1.it, and ale.dellatorre{at}uniroma1.it. Constantianus J. M. Koenraadt, Department of Entomology, Cornell University, Ithaca, NY 14850, E-mail: cjk48{at}cornell.edu. Caterina Fanello, London School of Hygiene and Tropical Medicine, Keppel St., WC1E 7HT London, UK, E-mail: Caterina.Fanello{at}lshtm.ac.uk. Udom Kijchalao and James W. Jones, Armed Forces Research Institute for Medical Sciences, Bangkok, Thailand, E-mails: udomk{at}afrims.org and james.jones{at}afrims.org. Thomas W. Scott, Department of Entomology, University of California, Davis, CA, E-mail: twscott{at}ucdavis.edu.

Reprint requests: Alessandra della Torre, Department of Public Health Sciences, University of Rome "La Sapienta," Piazzole Aldo Moro, 5, 00185 Rome, Italy, E-mail: ale.dellatorre{at}uniroma1.it.