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A new tent trap for sampling exophagic and endophagic members of the Anopheles gambiae complex

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Govella, Nicodem, Chaki, Prosper P, Geissbuhler, Y., Kannady, K., Okumu, F., Charlwood, J. D., Anderson, R. A. and Killeen, Gerry ORCID: https://orcid.org/0000-0002-8583-8739 (2009) 'A new tent trap for sampling exophagic and endophagic members of the Anopheles gambiae complex'. Malaria Journal, Vol 8, Issue 157, pp. 1-12.

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Abstract

Background: Mosquito sampling methods are essential for monitoring and evaluating malaria vector control interventions. In urban Dar es Salaam, human landing catch (HLC) is the only method sufficiently sensitive for monitoring malaria-transmitting Anopheles. HLC is labour intensive, cumbersome, hazardous, and requires such intense supervision that is difficulty to sustain on large scales. Methods: Novel tent traps were developed as alternatives to HLC. The Furvela tent, designed in Mozambique, incorporates a CDC Light trap (LT) components, while two others from Ifakara, Tanzania (designs A and B) require no electricity or moving parts. Their sensitivity for sampling malaria vectors was compared with LT and HLC over a wide range of vector abundances in rural and urban settings in Tanzania, with endophagic and exophagic populations, respectively, using randomised Latin-square and cross-over experimental designs. Results: The sensitivity of LTs was greater than HLC while the opposite was true of Ifakara tent traps (crude mean catch of An. gambiae sensu lato relative to HLC = 0.28, 0.65 and 1.30 for designs A, B and LT in a rural setting and 0.32 for design B in an urban setting). However, Ifakara B catches correlated far better to HLC (r(2) = 0.73, P < 0.001) than any other method tested (r(2) = 0.04, P = 0.426 and r(2) = 0.19, P = 0.006 for Ifakara A and LTs respectively). Only Ifakara B in a rural setting with high vector density exhibited constant sampling efficiency relative to HLC. The relative sensitivity of Ifakara B increased as vector densities decreased in the urban setting and exceeded that of HLC at the lowest densities. None of the tent traps differed from HLC in terms of the proportions of parous mosquitoes (P >= 0.849) or An. gambiae s.l. sibling species (P >= 0.280) they sampled but both Ifakara A and B designs failed to reduce the proportion of blood-fed mosquitoes caught (Odds ratio [95% Confidence Interval] = 1.6 [1.2, 2.1] and 1.0 [0.8, 1.2], P = 0.002 and 0.998, respectively), probably because of operator exposure while emptying the trap each morning. Conclusion: The Ifakara B trap may have potential for monitoring and evaluating a variety of endophagic and exophagic Afrotropical malaria vectors, particularly at low but epidemiologically relevant population densities. However, operator exposure to mosquito bites remains a concern so additional modifications or protective measures will be required before this design can be considered for widespread, routine use.

Item Type: Article
Uncontrolled Keywords: DAR-ES-SALAAM MALARIA VECTOR CONTROL HUMAN LANDING CATCH CONTROL LIGHT TRAP TREATED BED NETS WESTERN KENYA MOSQUITOS DIPTERA MBITA TRAP BEHAVIORAL-RESPONSES RICE IRRIGATION
Subjects: QX Parasitology > Insects. Other Parasites > QX 650 Insect vectors
QX Parasitology > Insects. Other Parasites > QX 515 Anopheles
QX Parasitology > Insects. Other Parasites > QX 600 Insect control. Tick control
QX Parasitology > Insects. Other Parasites > QX 510 Mosquitoes
Faculty: Department: Groups (2002 - 2012) > Vector Group
Digital Object Identifer (DOI): https://doi.org/10.1186/1475-2875-8-157
Depositing User: Users 183 not found.
Date Deposited: 15 Jun 2010 16:24
Last Modified: 16 Sep 2019 10:12
URI: https://archive.lstmed.ac.uk/id/eprint/279

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