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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 ISSN 1360-2276.

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Official URL: http://dx.doi.org/10.1111/tmi.13640

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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
Divisions: Faculty of Science, Engineering and Medicine > 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:
DateEvent
September 2021Published
11 June 2021Available
11 June 2021Accepted
Volume: 26
Number: 9
Page Range: pp. 1127-1138
DOI: 10.1111/tmi.13640
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): 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
Date of first compliant deposit: 14 June 2021
Date of first compliant Open Access: 11 June 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
204350/2014-0Conselho Nacional de Desenvolvimento Científico e Tecnológicohttp://dx.doi.org/10.13039/501100003593

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