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Improving houses in the Bolivian Chaco increases effectiveness of residual insecticide spraying against infestation with Triatoma infestans, vector of Chagas disease
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Gonçalves, Raquel, Landivar, Daniel, Grover Sañez Liendo, Edson, Mamani Fernandez, Janet, Ismail, Hanafy M., Paine, Mark J. I., Courtenay, Orin and Bern, Caryn (2021) Improving houses in the Bolivian Chaco increases effectiveness of residual insecticide spraying against infestation with Triatoma infestans, vector of Chagas disease. Tropical Medicine & International Health, 26 (9). pp. 1127-1138. doi:10.1111/tmi.13640
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Official URL: http://dx.doi.org/10.1111/tmi.13640
Abstract
Objective:
Failure to control domestic Triatoma infestans in the Chaco is attributed to vulnerable adobe construction which provides vector refuges and diminishes insecticide contact. We conducted a pilot to test impact of housing improvement plus indoor residual spraying (IRS) on house infestation and vector abundance in a rural community in the Bolivian Chaco.
Methods:
The intervention included three arms: housing improvement + IRS [HI], assisted IRS [AS] in which the team helped to clear the house pre-IRS, and routine IRS [RS]. HI used locally available materials, traditional construction techniques, and community participation. Vector parameters were assessed by Timed Manual Capture for 2 person-hours per house at baseline and medians of 114, 173, 314, 389, and 445 days post-IRS-1. A second IRS round was applied at a median of 314 days post-IRS-1.
Results:
Post-intervention infestation indices and abundance fell in all three arms. The mean odds of infestation was 0.29 (95% CL 0.124, 0.684) in the HI relative to the RS arm. No difference was observed between AS and RS. Vector abundance was reduced by a mean 44% (24.8, 58.0) in HI compared to RS, with no difference between AS and RS. Median delivered insecticide concentrations per house were lower than the target of 50mg/m2 in >90% of houses in all arms.
Conclusion:
Housing improvement using local materials and community participation is a promising strategy to improve IRS effectiveness in the Bolivian Chaco. A larger trial is needed to quantify the impact on re-infestation over time.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | H Social Sciences > HD Industries. Land use. Labor Q Science > QL Zoology R Medicine > RA Public aspects of medicine R Medicine > RC Internal medicine |
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| Divisions: | Faculty of Science > Life Sciences (2010- ) | ||||||||
| Library of Congress Subject Headings (LCSH): | Triatoma , Chagas' disease , Chagas' disease -- Prevention -- Bolivia -- Chaco, Insect pests -- Integrated control, Insects as carriers of disease -- Integrated control, Vector control, Housing -- Bolivia -- Chaco, Dwellings -- Bolivia -- Chaco -- Remodeling | ||||||||
| Journal or Publication Title: | Tropical Medicine & International Health | ||||||||
| Publisher: | Wiley-Blackwell Publishing Ltd. | ||||||||
| ISSN: | 1360-2276 | ||||||||
| Official Date: | September 2021 | ||||||||
| Dates: |
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| Volume: | 26 | ||||||||
| Number: | 9 | ||||||||
| Page Range: | pp. 1127-1138 | ||||||||
| DOI: | 10.1111/tmi.13640 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Publisher Statement: | This is the peer reviewed version of the following article: Gonçalves, R., Landivar, D., Grover Sañez Liendo, E., Mamani Fernandez, J., Ismail, H.M., Paine, M.J.I., Courtenay, O. and Bern, C. (2021), Improving houses in the Bolivian Chaco increases effectiveness of residual insecticide spraying against infestation with Triatoma infestans, vector of Chagas disease. Tropical Medicine & International Health, which has been published in final form at https://doi.org/10.1111/tmi.13640. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| RIOXX Funder/Project Grant: |
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