An Exposure-Free Tool for Monitoring Adult Malaria Mosquito Populations

Nicodem J. Govella Ifakara Health Institute, Coordination Office, Dar es Salaam, Tanzania; Disease Control and Vector Biology Unit, London School of Hygiene and Tropical Medicine, London, United Kingdom; Liverpool School of Tropical Medicine, Liverpool, United Kingdom

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Jason D. Moore Ifakara Health Institute, Coordination Office, Dar es Salaam, Tanzania; Disease Control and Vector Biology Unit, London School of Hygiene and Tropical Medicine, London, United Kingdom; Liverpool School of Tropical Medicine, Liverpool, United Kingdom

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Gerry F. Killeen Ifakara Health Institute, Coordination Office, Dar es Salaam, Tanzania; Disease Control and Vector Biology Unit, London School of Hygiene and Tropical Medicine, London, United Kingdom; Liverpool School of Tropical Medicine, Liverpool, United Kingdom

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Catches of Anopheles gambiae and An. arabiensis with the Ifakara Tent Trap-model B (ITT-B) correlate better with human landing catches than any other method but fail to reduce the proportion of blood-fed mosquito caught, which indicates that users are exposed to bites during collection. An improved C model (ITT-C) was developed and evaluated by comparing with ITT-B in semi-field and full-field conditions in southern Tanzania. The sensitivity of the ITT-C was approximately two times that of the ITT-B: relative rate (95% confidence interval) = 1.92 (1.52–2.42), 1.90 (1.48–2.43), and 2.30 (1.54–3.30) for field populations of An. arabiensis, Culex spp., and Mansonia spp., respectively. The ITT-C caught 73% less blood-fed An. arabiensis than the ITT-B in open field experiments and none in semi-field experiments, which confirmed that the C design is a safe trapping method. Validation of ITT-C by comparison with human landing catches and parasitologic measures of human infection status may be necessary to confirm that this design produces consistent and epidemiologically meaningful results.

Author Notes

*Address correspondence to Nicodem J. Govella, Ifakara Health Institute, Coordination Office, PO Box 78373, Kiko Avenue, Mikocheni, Dar es Salaam, Tanzania. E-mail: govella@ihi.or.tz

Financial support: The work was supported by the Wellcome Trust (Research Career Development Fellowship no. 076806 awarded to Gerry F. Killeen) and the Bill and Melinda Gates Foundation through the Malaria Transmission Consortium (Award no. 45114), coordinated by Dr. Neil Lobo and Professor Frank Collins at Notre Dame University (Notre Dame, IN). The funding source had no involvement in the study design, analysis, writing of the manuscript, or decision to submit for publication.

Authors' addresses: Nicodem J. Govella and Gerry F. Killeen, Ifakara Health Institute, Coordination Office, Mikocheni, Dar es Salaam, Tanzania and Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, United Kingdom, E-mails: govella@ihi.or.tz and gkilleen@ihi.or.tz. Jason D. Moore, Ifakara Health Institute, Ifakara Branch, Ifakara, Morogoro, Tanzania and Disease Control and Vector Biology Unit, London School of Hygiene and Tropical Medicine, London, United Kingdom, E-mail: jdmoore@gmail.com.

Reprint requests: Nicodem J. Govella, Ifakara Health Institute, Coordination Office, PO Box 78373, Kiko Avenue, Mikocheni, Dar es Salaam, Tanzania, E-mail: govella@ihi.or.tz.

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