Post-control surveillance of Triatoma infestans and Triatoma sordida with chemically-baited sticky traps.
BACKGROUND: Chagas disease prevention critically depends on keeping houses free of triatomine vectors. Insecticide spraying is very effective, but re-infestation of treated dwellings is commonplace. Early detection-elimination of re-infestation foci is key to long-term control; however, all availabl...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2012-01-01
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| Series: | PLoS Neglected Tropical Diseases |
| Online Access: | http://europepmc.org/articles/PMC3441417?pdf=render |
| _version_ | 1819262981313134592 |
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| author | Antonieta Rojas de Arias Fernando Abad-Franch Nidia Acosta Elsa López Nilsa González Eduardo Zerba Guillermo Tarelli Héctor Masuh |
| author_facet | Antonieta Rojas de Arias Fernando Abad-Franch Nidia Acosta Elsa López Nilsa González Eduardo Zerba Guillermo Tarelli Héctor Masuh |
| author_sort | Antonieta Rojas de Arias |
| collection | DOAJ |
| description | BACKGROUND: Chagas disease prevention critically depends on keeping houses free of triatomine vectors. Insecticide spraying is very effective, but re-infestation of treated dwellings is commonplace. Early detection-elimination of re-infestation foci is key to long-term control; however, all available vector-detection methods have low sensitivity. Chemically-baited traps are widely used in vector and pest control-surveillance systems; here, we test this approach for Triatoma spp. detection under field conditions in the Gran Chaco. METHODOLOGY/PRINCIPAL FINDINGS: Using a repeated-sampling approach and logistic models that explicitly take detection failures into account, we simultaneously estimate vector occurrence and detection probabilities. We then model detection probabilities (conditioned on vector occurrence) as a function of trapping system to measure the effect of chemical baits. We find a positive effect of baits after three (odds ratio [OR] 5.10; 95% confidence interval [CI(95)] 2.59-10.04) and six months (OR 2.20, CI(95) 1.04-4.65). Detection probabilities are estimated at p ≈ 0.40-0.50 for baited and at just p ≈ 0.15 for control traps. Bait effect is very strong on T. infestans (three-month assessment: OR 12.30, CI(95) 4.44-34.10; p ≈ 0.64), whereas T. sordida is captured with similar frequency in baited and unbaited traps. CONCLUSIONS/SIGNIFICANCE: Chemically-baited traps hold promise for T. infestans surveillance; the sensitivity of the system at detecting small re-infestation foci rises from 12.5% to 63.6% when traps are baited with semiochemicals. Accounting for imperfect detection, infestation is estimated at 26% (CI(95) 16-40) after three and 20% (CI(95) 11-34) after six months. In the same assessments, traps detected infestation in 14% and 8.5% of dwellings, whereas timed manual searches (the standard approach) did so in just 1.4% of dwellings only in the first survey. Since infestation rates are the main indicator used for decision-making in control programs, the approach we present may help improve T. infestans surveillance and control program management. |
| first_indexed | 2024-12-23T20:06:20Z |
| format | Article |
| id | doaj.art-8675888a6dce439a9731a3dce151777a |
| institution | Directory Open Access Journal |
| issn | 1935-2727 1935-2735 |
| language | English |
| last_indexed | 2024-12-23T20:06:20Z |
| publishDate | 2012-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS Neglected Tropical Diseases |
| spelling | doaj.art-8675888a6dce439a9731a3dce151777a2022-12-21T17:32:56ZengPublic Library of Science (PLoS)PLoS Neglected Tropical Diseases1935-27271935-27352012-01-0169e182210.1371/journal.pntd.0001822Post-control surveillance of Triatoma infestans and Triatoma sordida with chemically-baited sticky traps.Antonieta Rojas de AriasFernando Abad-FranchNidia AcostaElsa LópezNilsa GonzálezEduardo ZerbaGuillermo TarelliHéctor MasuhBACKGROUND: Chagas disease prevention critically depends on keeping houses free of triatomine vectors. Insecticide spraying is very effective, but re-infestation of treated dwellings is commonplace. Early detection-elimination of re-infestation foci is key to long-term control; however, all available vector-detection methods have low sensitivity. Chemically-baited traps are widely used in vector and pest control-surveillance systems; here, we test this approach for Triatoma spp. detection under field conditions in the Gran Chaco. METHODOLOGY/PRINCIPAL FINDINGS: Using a repeated-sampling approach and logistic models that explicitly take detection failures into account, we simultaneously estimate vector occurrence and detection probabilities. We then model detection probabilities (conditioned on vector occurrence) as a function of trapping system to measure the effect of chemical baits. We find a positive effect of baits after three (odds ratio [OR] 5.10; 95% confidence interval [CI(95)] 2.59-10.04) and six months (OR 2.20, CI(95) 1.04-4.65). Detection probabilities are estimated at p ≈ 0.40-0.50 for baited and at just p ≈ 0.15 for control traps. Bait effect is very strong on T. infestans (three-month assessment: OR 12.30, CI(95) 4.44-34.10; p ≈ 0.64), whereas T. sordida is captured with similar frequency in baited and unbaited traps. CONCLUSIONS/SIGNIFICANCE: Chemically-baited traps hold promise for T. infestans surveillance; the sensitivity of the system at detecting small re-infestation foci rises from 12.5% to 63.6% when traps are baited with semiochemicals. Accounting for imperfect detection, infestation is estimated at 26% (CI(95) 16-40) after three and 20% (CI(95) 11-34) after six months. In the same assessments, traps detected infestation in 14% and 8.5% of dwellings, whereas timed manual searches (the standard approach) did so in just 1.4% of dwellings only in the first survey. Since infestation rates are the main indicator used for decision-making in control programs, the approach we present may help improve T. infestans surveillance and control program management.http://europepmc.org/articles/PMC3441417?pdf=render |
| spellingShingle | Antonieta Rojas de Arias Fernando Abad-Franch Nidia Acosta Elsa López Nilsa González Eduardo Zerba Guillermo Tarelli Héctor Masuh Post-control surveillance of Triatoma infestans and Triatoma sordida with chemically-baited sticky traps. PLoS Neglected Tropical Diseases |
| title | Post-control surveillance of Triatoma infestans and Triatoma sordida with chemically-baited sticky traps. |
| title_full | Post-control surveillance of Triatoma infestans and Triatoma sordida with chemically-baited sticky traps. |
| title_fullStr | Post-control surveillance of Triatoma infestans and Triatoma sordida with chemically-baited sticky traps. |
| title_full_unstemmed | Post-control surveillance of Triatoma infestans and Triatoma sordida with chemically-baited sticky traps. |
| title_short | Post-control surveillance of Triatoma infestans and Triatoma sordida with chemically-baited sticky traps. |
| title_sort | post control surveillance of triatoma infestans and triatoma sordida with chemically baited sticky traps |
| url | http://europepmc.org/articles/PMC3441417?pdf=render |
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