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Limitation of using synthetic human odours to test mosquito repellents
Fredros O Okumu*1,2,3, Emmanuel Titus1, Edgar Mbeyela1, Gerry F Killeen1,4,5 and Sarah J Moore1,3,5
Address: 1Biomedical and Environmental Sciences Thematic group, Ifakara Health Institute, PO Box 53 Ifakara, Tanzania, 2School of Biological Sciences, University of Nairobi, PO Box 30197 Nairobi, Kenya, 3Disease Control and Vector Biology Unit, London School of Hygiene and Tropical Medicine, Keppel Street WC1E 7HT, London, UK, 4Vector group, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool L3 5QA, UK and 5School of Biological Sciences, Durham University, South Road, DH1 3LE, Durham, UK Email: Fredros O Okumu* - fredros@ihi.or.tz; Emmanuel Titus - xolaniross@yahoo.co.uk; Edgar Mbeyela - embeyela@ihi.or.tz; Gerry F Killeen - gkilleen@ihi.or.tz; Sarah J Moore - smoore@ihi.or.tz * Corresponding author

Published: 7 July 2009 Malaria Journal 2009, 8:150 doi:10.1186/1475-2875-8-150

Received: 5 May 2009 Accepted: 7 July 2009

This article is available from: http://www.malariajournal.com/content/8/1/150 © 2009 Okumu et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract
Background: Gold-standard tests of mosquito repellents involve exposing human volunteers to host-seeking mosquitoes, to assess the protective efficacy of the repellents. These techniques are not exposure-free and cannot be performed prior to toxicological evaluation. It is postulated that synthetic lures could provide a useful assay that mimics in-vivo conditions for use in high-throughput screening for mosquito repellents. Methods: This paper reports on a semi-field evaluation of



References: 1. Bernier UR, Kline DL, Posey HP: Human emanations and related natural compounds that inhibit mosquito host finding abilities. In Insect Repellents: Principles, Methods and Uses Edited by: Debboun M, Frances SP, Strickman D. New York: CRC Press Taylor and Francis Group; 2007:77-100. Gupta RK, Rutledge L: Role of repellents in vector control and disease prevention. Am J Trop Med Hyg 1994, 50:82-86. Govere JM, Durrheim DN: Techniques for evaluating repellents. In Insect Repellents: Principles, Methods and Uses Edited by: Debboun M, Frances SP, Strickman D. New York: CRC Press Taylor and Francis Group; 2007:147-159. Barnard DR: Global collaboration for development of pesticides for public health: repellents and toxicants for personal protection. Geneva: World Health Organization; 2000. Takken W, Knols BG: Odor-mediated behavior of Afrotropical malaria mosquitoes. Annu Rev Entomol 1999, 44:131-157. Knols BG, de Jong R, Takken W: Differential attractiveness of isolated humans to mosquitoes in Tanzania. Trans R Soc Trop Med Hyg 1995, 89:604-606. Keystone JS: Of bites and body odour. Lancet 1996, 347:1423. Khan AA, Maibach HI, Skidmore DL: A study of insect repellents 2. Effect of temperature on protection time. J Econ Entomol 1973, 66:437-439. Okumu FO: Medium Range Olfactory Responses of the Malaria Vector, Anopheles gambiae s.s to synthetic odor blends. In Masters Thesis Nairobi: University of Nairobi; 2008. Fradin MS, Day JF: Comparative efficacy of insect repellents against mosquito bites. NEJM 2002, 347:13-18. Fradin MS: Mosquitoes and mosquito repellents: a clinician 's guide. Ann Int Med 1998, 128:931-940. The insect repellent deet [http://www.epa.gov/pesticides/ factsheets/chemicals/deet.htm] Environmental Protection Agency: Reregistration Eligibility Decision (RED) DEET. Washington: Environmental Protection Agency; 1998. Schreck CE, Leonhardt BA: Efficacy assessment of Quwenling, a mosquito repellent from China. J Am Mosq Control Assoc 1991, 7:433-436. 24. 25. 26. 27. 2. 3. Carroll SP, Loye J: PMD, A registered botanical mosquito repellent with DEET-like efficacy. J Am Mosq Control Assoc 2006, 22:507-514. Dogan EB, Ayres JW, Rossignol PA: Behavioural mode of action of deet: inhibition of lactic acid attraction. Med Vet Entomol 1999, 13:97-100. Ferguson HM, Ng 'habi KR, Walder T, Kadungula D, Moore SJ, Lyimo I, Russell TL, Urassa H, Mshinda H, Killeen GF, Knols BGJ: Establishment of a large semi-field system for experimental study of African malaria vector ecology and control in Tanzania. Malar J 2008, 7:158. Njiru BN, Mukabana WR, Takken W, Knols BGJ: Trapping of the malaria vector Anopheles gambiae with odour-baited MM-X traps in semi-field conditions in western Kenya. Malar J 2006, 5:39. Kline DL: Comparison of two American Biophysics mosquito traps: the professional and the new counter flow geometry trap. J Am Mosq Control Assoc 1999, 15:276-282. Curtis CF, Lines JD, Ijumba J, Callaghan A, Hill N, Karimzad MA: The relative efficacy of repellents against mosquito vectors of disease. Med Vet Entomol 1987, 1:109-119. Costantini C, Badolo A, Ilboudo-Sanogo E: Field evaluation of the efficacy and persistence of insect repellents DEET, IR and KBR 3023 against Anopheles gambiae complex and other Afrotropical vector mosquitoes. Trans R Soc Trop Med Hyg 3535, 98:644-652. Lindsay SW, Janneh LM: Preliminary field trials of personal protection against mosquitoes in The Gambia using deet or permethrin in soap, compared with other methods. Med Vet Entomol 1989, 3:97-100. Gibson G, Constantini C, Sagnon F, Torre A, Coluzzi M: The responses of Anopheles gambiae, and other mosquitoes in Burkina Faso, to CO2-the start of a search for synthetic human odour. Ann Trop Med Parasitol 1997, 91:123-124. Sharma KR, Seenivasagan T, Rao AN, Ganesan K, Agrawal OP, Prakash S: Mediation of oviposition responses in the malaria mosquito Anopheles stephensi Liston by certain fatty acid esters. Parasitol Res 2009, 104:281-286. Knight JC, Corbet SA: Compounds affecting mosquito oviposition: structure-activity relationships and concentration effects. J Am Mosq Control Assoc 1991, 7:37-41. Gabel ML, Spencer IS, Akers WA: Evaporation rates and protection times of repellents. Mosq News 1976, 36:141-146. Ditzen M, Pellegrino M, Vosshall LB: Insect Odorant Receptors Are Molecular Targets of the Insect Repellent DEET. Science 2008, 319(5871):1838-1842. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. Page 7 of 7 (page number not for citation purposes)

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