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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

Tropical medicine & international health, 2021-09, Vol.26 (9), p.1127-1138 [Peer Reviewed Journal]

2021 John Wiley & Sons Ltd ;ISSN: 1360-2276 ;EISSN: 1365-3156 ;DOI: 10.1111/tmi.13640

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  • Title:
    Improving houses in the Bolivian Chaco increases effectiveness of residual insecticide spraying against infestation with Triatoma infestans, vector of Chagas disease
  • Author: Gonçalves, Raquel ; Landivar, Daniel ; Grover Sañez Liendo, Edson ; Mamani Fernandez, Janet ; Ismail, Hanafy M. ; Paine, Mark J. I. ; Courtenay, Orin ; Bern, Caryn
  • Subjects: Abundance ; Bolivia ; Chaco ; Chagas disease ; Citizen participation ; Clay ; Community involvement ; Community participation ; Construction ; Houses ; Housing ; housing improvement ; indoor residual spraying ; Infestation ; Insecticides ; Residential areas ; Rural areas ; Rural communities ; Spraying ; Triatoma infestans ; vector control ; Vector-borne diseases
  • Is Part Of: Tropical medicine & international health, 2021-09, Vol.26 (9), p.1127-1138
  • Description: 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 the 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 50 mg/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 reinfestation over time.
  • Publisher: Oxford: Blackwell Publishing Ltd
  • Language: English
  • Identifier: ISSN: 1360-2276
    EISSN: 1365-3156
    DOI: 10.1111/tmi.13640
  • Source: GFMER Free Medical Journals
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