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Centers for Disease Control Light Traps for Monitoring Anopheles arabiensis Human Biting Rates in an Area with Low Vector Density and High Insecticide-Treated Bed Net Use

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  • The W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Malaria Research Institute, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland

Human landing catches (HLCs) are currently the preferred method to determine vector human biting rates (HBRs), which are key determinants of entomologic inoculation rates and important measures for assessing the impact of vector control efforts. Although HLCs are the most direct means of establishing HBRs, they are labor-intensive, and their use is facing increasing ethical concerns. The relationship between Centers for Disease Control (CDC) light traps and HLC collections was evaluated in Macha, Zambia during the 2007–2008 and 2008–2009 rainy seasons. A CDC light trap captured on average 1.91 (95% confidence interval = 1.16–2.28) times as many An. arabiensis per night as an indoor HLC. Additionally, nets treated with deltamethrin did not affect the numbers of An. arabiensis collected. Our results suggest that in regions where use of vector control interventions is high and vector densities are low, CDC light traps can be used to monitor An. arabiensis HBRs.

Author Notes

*Address correspondence to Christen M. Fornadel, The W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, 615 North Wolfe Street, Baltimore, MD 21205. E-mail: cfornade@jhsph.edu

Financial support: This study was supported by the Johns Hopkins Malaria Research Institute (Douglas E. Norris), National Institutes of Health training grant T32AI007417 (Laura C. Norris), and a Simpson Student Award from the Tropical Medicine Dinner Club of Baltimore and a Johns Hopkins Bloomberg School of Public Health Sommer Scholarship (Christen M. Fornadel).

Authors' addresses: Christen M. Fornadel, Laura C. Norris, and Douglas E. Norris, The W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, 615 North Wolfe Street, Baltimore, MD 21205, E-mails: cfornade@jhsph.edu, lnorris@jhsph.edu, and dnorris@jhsph.edu.

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