Cited by 45Malaria Research and ControlInsect Pest Control StrategiesMosquito-borne diseases and control

Eave tubes for malaria control in Africa: prototyping and evaluation against Anopheles gambiae s.s. and Anopheles arabiensis under semi-field conditions in western Kenya

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Snetselaar, Janneke, Njiru, Basilio N., Gachie, Beatrice, Owigo, Phillip, Andriessen, Rob, Glunt, Katey, Osinga, Anne J., Mutunga, James +2 more·2017·Malaria Journal

Abstract

BACKGROUND: Whilst significant progress has been made in the fight against malaria, vector control continues to rely on just two insecticidal methods, i.e., indoor residual spraying and insecticidal bed nets. House improvement shows great potential to complement these methods and may further reduce indoor mosquito biting and disease transmission. Open eaves serve as important mosquito house entry points and provide a suitable location for intercepting host-seeking anophelines. This study describes semi-field experiments in western Kenya with eave tubes, a household protection product that leverages the natural behaviour of host-seeking malaria mosquitoes. METHODS: Semi-field experiments were conducted in two screen-houses. In both of these a typical western Kenyan house, with mud walls and corrugated iron sheet roofing, was built. Eave tubes with bendiocarb- or deltamethrin-treated eave tube inserts were installed in the houses, and the impact on house entry of local strains of Anopheles gambiae and Anopheles arabiensis was determined. Experiments with open eave tubes (no netting) were conducted as a control and to determine house entry through eave tubes. Insecticidal activity of the inserts treated with insecticide was examined using standard 3-min exposure bioassays. RESULTS: Experiments with open eave tubes showed that a high percentage of released mosquitoes entered the house through tubes during experimental nights. When tubes were fitted with bendiocarb- or deltamethrin-treated inserts, on average 21% [95% CI 18-25%] and 39% [CI 26-51%] of An. gambiae s.s. were recaptured the following morning, respectively. This contrasts with 71% [CI 60-81%] in the treatment with open eaves and 54% [CI 47-61%] in the treatment where inserts were treated with fluorescent dye powder. For An. arabiensis recapture was 21% [CI 14-27%] and 22% [CI 18-25%], respectively, compared to 46% [CI 40-52%] and 25% [CI 15-35%] in the treatments with open tubes and fluorescent dye. CONCLUSIONS: Insecticide-treated eave tubes resulted in significant reductions in recapture rates for both malaria vector species, representing the first and promising results with this novel control tool against Kenyan malaria vectors. Further field evaluation of eave tubes under more realistic field conditions, as well as their comparison with existing approaches in terms of cost-effectiveness and community acceptance, is called for.

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Crossref · 10.1186/s12936-017-1926-5

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  • The dose transferred from eave tube inserts is sufficiently high that lethal doses of insecticide can be delivered during transient contact, even when the mosquitoes are classified as resistant to the active ingredient.

    “The dose transferred is sufficiently high that lethal doses of insecticide can be delivered during transient contact, even when the mosquitoes are classified as ‘resistant’ to the active ingredient [4, 5].”

    From Semi-field studies to better understand the impact of eave tubes on mosquito mortality and behaviour (2018) · cites this paper as [5]

    The Methods (Exposure bioassays; page unavailable) describe three-minute contact with insecticide-treated inserts, and the Results (Exposure bioassays; page unavailable) report high mortality after that exposure for several treatments. The paper does not classify the tested mosquitoes as resistant to those insecticides, so it does not establish the claim's resistance qualifier. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Eave tubes combined with screening of doors and windows increase overnight mortality rate.

    “When combined with screening of doors and windows, preliminary evidence suggests that eave tubes reduce entry of mosquitoes and increase overnight mortality rate, leading to reduced transmission risk at both household and community levels [4–7].”

    From Semi-field studies to better understand the impact of eave tubes on mosquito mortality and behaviour (2018) · cites this paper as [5]

    The Results (Insecticide treatments; page unavailable) report fewer mosquitoes recaptured the morning after exposure to insecticide-treated eave tubes and describe a significant impact on mosquito mortality. The Discussion says the experimental windows were screened, but the doors were kept closed rather than screened. Overnight mortality for the claimed combination of eave tubes and door-and-window screening was not directly measured. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Mosquitoes entering tubes are blocked by inserts and upon contact insecticidal particles are transferred onto the mosquito body, delivering sufficiently high dose to potentially overcome insecticide resistance.

    “Mosquitoes entering the tubes are blocked by the inserts and upon contact insecticidal particles are transferred onto the mosquito body, delivering sufficiently high dose to potentially overcome insecticide resistance [14, 16, 19, 26].”

    From Semi-field evaluation of the cumulative effects of a "Lethal House Lure" on malaria mosquito mortality (2019) · cites this paper as [16]

    The Background (page not provided) describes an insecticide-treated netting barrier inside the tube, and Methods > Exposure bioassays (page not provided) describes measuring fluorescent particles on exposed mosquito bodies. The paper does not establish that the transferred insecticide dose is high enough to overcome resistance; its Discussion instead discusses managing resistance through alternative or multiple insecticides. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Insecticide-treated tubes combined with screening of doors and windows reduce entry of mosquitoes.

    “preliminary evidence suggests insecticide-treated tubes, combined with screening of doors and windows to make the house more ‘mosquito proof’, reduces entry of mosquitoes and increases overnight mortality rate, leading to reduced transmission risk at both household and community levels [14–17].”

    From Semi-field evaluation of the cumulative effects of a "Lethal House Lure" on malaria mosquito mortality (2019) · cites this paper as [16]

    The Discussion reports that treated eave tubes and screened windows effectively blocked mosquito entry. However, the experimental doors were kept closed rather than screened, so the study does not directly establish the effect of the stated combination with door screening. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • About 50% of mosquitoes that enter insecticide-treated tubes might die overnight.

    “Both studies suggested that about 50% of mosquitoes that enter insecticide-treated tubes (in these cases, a wettable powder formulation of 10% beta-cyfluthrin) might die overnight, which is broadly in line with similar studies conducted in Kenya and Tanzania [15, 16].”

    From Semi-field evaluation of the cumulative effects of a "Lethal House Lure" on malaria mosquito mortality (2019) · cites this paper as [16]

    The Results (Insecticide treatments; page unavailable) report that 21% of released An. gambiae were recaptured after a night with deltamethrin-treated inserts, versus 71% with open tubes—a 50-percentage-point difference consistent with an insecticidal effect. The study does not establish that 50% of mosquitoes entering treated tubes died overnight: its denominator is mosquitoes released, and its overnight measure is recapture, not confirmed death. (LLM, conf=0.83)

    Experimental — accuracy not yet measured

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Authors
Snetselaar, J., Njiru, B. N., Gachie, B., Owigo, P., Andriessen, R., Glunt, K., Osinga, A. J., Mutunga, J., Farenhorst, M., & Knols, B. G. J.
Affiliations
  • London School of Hygiene & Tropical Medicine (GB)
  • International Centre of Insect Physiology and Ecology (KE)
  • Pennsylvania State University (US)
  • Radboud University Nijmegen (NL)
Corresponding author
Farenhorst, Marit
Venue
Malaria Journal
Published
2017-07-04
Volume
16
Issue
1
Pages
276-276
ISSN
1475-2875 (ISSN-L)
OpenAlex
W2733178717
Cited by
43
References
41
Citations by year
2024: 12 · 2023: 6 · 2022: 5 · 2021: 5 · 2020: 3 · 2019: 4 · 2018: 6 · 2017: 2
FWCI
3.85
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Malaria Journal (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • LSHTM Research Online (London School of Hygiene and Tropical Medicine) (acceptedVersion)
  • Radboud Repository (Radboud University) (submittedVersion, other-oa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Radboud Repository (Radboud University) (submittedVersion)
Funders
  • European Commission (FP7-HEALTH-2012-INNOVATION-1, 306105)
  • FP7 Health
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Malaria Research and Control
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Insect Pest Control Strategies
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Mosquito-borne diseases and control
Keywords
malaria vector control, Anopheles gambiae s.s., Anopheles arabiensis, bendiocarb, deltamethrin, home improvement, semi-field trials, screen house, recapture rates, Western Kenya, Kenya, insecticide efficacy, host-seeking mosquitoes, indoor residual spraying
MeSH terms
Mosquito Vectors, Animals, Anopheles, Female, Housing, Humans, Insect Bites and Stings, Insecticides, Kenya, Malaria, Mosquito Control, Nitriles, Pyrethrins, Phenylcarbamates

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