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Am. J. Trop. Med. Hyg., 77(6_Suppl), 2007, pp. 243-248
Copyright © 2007 by The American Society of Tropical Medicine and Hygiene

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Evaluation of Bednets After 38 Months of Household Use in Northwest Ghana

Stephen C. Smith*, Uday B. Joshi, Mark Grabowsky, Joel Selanikio, Theresa Nobiya, AND Thomas Aapore
Division of Parasitic Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia; Atlanta Research and Education Foundation, Decatur, Georgia; American Red Cross, Washington, District of Columbia; Data Dyne Group, Washington, District of Columbia; Ghana Red Cross, Accra, Ghana

A total of 255 bednets were collected 38 months after distribution in Lawra District of northwest Ghana to examine their physical condition and residual insecticide levels. Physical condition varied from nearly pristine to highly damaged. In 50 selected nets, 2023 holes ≥ 0.5 cm and 31 holes ≥ 10 cm were counted. The incidence of holes increases toward the bottom edge of the net. Seam failures were found in 50% of the nets. Repairs, mostly sewn, were evident in 64% of the nets. Using a combination of bromine x-ray fluorescence (XRF) spectrometry, high-pressure liquid chromatography, and cone bioassays, it was determined that 14.9% of the nets had retained full insecticidal strength. These results highlight the value of real-world data on bednet longevity to guide decisions regarding mosquito control strategies, bednet purchasing, frequency of bednet replacement, and product development.

Received January 19, 2007. Accepted for publication September 26, 2007.

Disclaimer: The findings and conclusions in this report are those of the authors and do not necessarily represent the views of the Centers for Disease Control and Prevention.

* Address correspondence to Stephen Smith, Division of Parasitic Diseases, Centers for Disease Control and Prevention, 4770 Buford Highway, Mail Stop F-12, Atlanta, GA 30341-3724. E-mail: scsmith2{at}cdc.gov

Authors’ addresses: Stephen C. Smith and Uday B. Joshi, Division of Parasitic Diseases, Centers for Disease Control and Prevention, 4770 Buford Highway, Mail Stop F-12, Atlanta, GA 30341-3717, Telephone: +1 (770) 488-4025, +1 (770) 488-7479, Fax: +1 (770) 488-4108, E-mail: scsmith2{at}cdc.gov, ujoshi{at}cdc.gov. Mark Grabowsky, The Global Fund to Fight AIDS, Tuberculosis and Malaria, 8 chemin Blandonnet, 1214 Vernier (GE), Switzerland, Telephone: +41-22-791-5943, E-mail: mark.grabowsky{at}theglobalfund.org. Joel Selanikio, DataDyne Group, 1804 Vernon Street NW, 2nd floor, Washington, DC, Telephone: +1 (202) 468-7227, E-mail: joel{at}datadynegroup.com. Theresa Nobiya and Thomas Aapore, Ghana Red Cross Society, P.O. Box 835, Accra, Ghana, Telephone: +233 (21) 662298, E-mails: tessnob{at}yahoo.com, thomas_aapore{at}yahoo.com.






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Copyright © 2007 by the American Society of Tropical Medicine and Hygiene.