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Gonçalves, Raquel, Landivar, Daniel, Liendo, Edson Grover Sañez, Fernandez, Janet Mamani, Ismail, Hanafy 
ORCID: https://orcid.org/0000-0002-9953-9588, Paine, Mark ORCID: https://orcid.org/0000-0003-2061-7713, 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, Vol 26, Issue 9, pp. 1127-1138.
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Goncalves House improvement R1_Accepted version MPaine June 21.pdf - Accepted Version Download (1MB) | Preview |
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 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.
| Item Type: | Article |
|---|---|
| Subjects: | QX Parasitology > Insects. Other Parasites > QX 503 Hemiptera (e.g., Bedbugs) WA Public Health > Health Problems of Special Population Groups > WA 395 Health in developing countries WC Communicable Diseases > Tropical and Parasitic Diseases > WC 705 Trypanosomiasis |
| Faculty: Department: | Biological Sciences > Vector Biology Department |
| Digital Object Identifer (DOI): | https://doi.org/10.1111/tmi.13640 |
| Depositing User: | Mel Finley |
| Date Deposited: | 01 Jul 2021 14:52 |
| Last Modified: | 11 Jun 2022 01:02 |
| URI: | https://archive.lstmed.ac.uk/id/eprint/18136 |
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