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An Improved Mosquito Electrocuting Trap that Safely Reproduces Epidemiologically Relevant Metrics of Mosquito Human-feeding Behaviours as Determined by Human Landing Catch.

Govella, N. J., Maliti, D. F., Mlwale, A. T., Masallu, J. P., Mirzai, N., Johnson, P. C. D., Ferguson, H. M. and Killeen, G. F. (2016) An Improved Mosquito Electrocuting Trap that Safely Reproduces Epidemiologically Relevant Metrics of Mosquito Human-feeding Behaviours as Determined by Human Landing Catch. Malaria journal, 15. p. 465. ISSN 1475-2875

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Abstract

Reliable quantification of mosquito host-seeking behaviours is required to determine the efficacy of vector control methods. For malaria, the gold standard approach remains the risky human landing catch (HLC). Here compare the performance of an improved prototype of the mosquito electrocuting grid trap (MET) as a safer alternative with HLC for measuring malaria vector behaviour in Dar es Salaam, Tanzania. Mosquito trapping was conducted at three sites within Dar es Salaam representing a range of urbanicity over a 7-month period (December 2012-July 2013, 168 sampling nights). At each site, sampling was conducted in a block of four houses, with two houses being allocated to HLC and the other to MET on each night of study. Sampling was conducted both indoors and outdoors (from 19:00 to 06:00 each night) at all houses, with trapping method (HLC and MET) being exchanged between pairs of houses at each site using a crossover design. The MET caught significantly more Anopheles gambiae sensu lato than the HLC, both indoors (RR [95 % confidence interval (CI)]) = 1.47 [1.23-1.76], P < 0.0001 and outdoors = 1.38 [1.14-1.67], P < 0.0001). The sensitivity of MET compared with HLC did not detectably change over the course of night for either An. gambiae s.l. (OR [CI]) = 1.01 [0.94-1.02], P = 0.27) or Culex spp. (OR [CI]) = 0.99 [0.99-1.0], P = 0.17) indoors and declined only slightly outdoors: An. gambiae s.l. (OR [CI]) = 0.92 [0.86-0.99], P = 0.04), and Culex spp. (OR [CI]) = 0.99 [0.98-0.99], P = 0.03). MET-based estimates of the proportions of mosquitoes caught indoors (P i ) or during sleeping hours (P fl ), as well as the proportion of human exposure to bites that would otherwise occurs indoors (π i ), were statistically indistinguishable from those based on HLC for An. gambiae s.l. (P = 0.43, 0.07 and 0.48, respectively) and Culex spp. (P = 0.76, 0.24 and 0.55, respectively). This improved MET prototype is highly sensitive tool that accurately quantifies epidemiologically-relevant metrics of mosquito biting densities, behaviours and human exposure distribution.

Item Type: Article
Keywords: Malaria vector, Anopheles gambiae, Culex, Mosquito, Behaviour, Exposure-free, TRAPS, Africa
Subjects: Malaria > Vector control
Divisions: Ifakara Health Institute > Environmental
Depositing User: Mr Joseph Madata
Date Deposited: 03 Feb 2017 13:47
Last Modified: 03 Feb 2017 13:47
URI: http://ihi.eprints.org/id/eprint/3929

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