House Reinfestation With Triatoma infestans (Hemiptera: Reduviidae) After Community-Wide Spraying With Insecticides in the Argentine Chaco: A Multifactorial Process
We investigated the dynamics and underlying causes of house (re)infestation with Triatoma infestans (Klug 1834) after a community-wide residual spraying with pyrethroids in a well-defined rural section of Pampa del Indio municipality (northeastern Argentina) over a 4-yr period. House infestation was...
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todo:paper_00222585_v54_n3_p646_Provecho2023-10-03T14:30:10Z House Reinfestation With Triatoma infestans (Hemiptera: Reduviidae) After Community-Wide Spraying With Insecticides in the Argentine Chaco: A Multifactorial Process Provecho, Y.M. Sol Gaspe, M. Del Pilar Fernández, M. Gürtler, R.E. Byrd, J. Chagas disease Insecticide resistance Reinfestation Triatoma infestans Vector control insecticide pyrethroid animal Argentina growth, development and aging housing insect control insect vector insecticide resistance nymph physiology population dynamics Triatoma Animals Argentina Housing Insect Control Insect Vectors Insecticide Resistance Insecticides Nymph Population Dynamics Pyrethrins Triatoma We investigated the dynamics and underlying causes of house (re)infestation with Triatoma infestans (Klug 1834) after a community-wide residual spraying with pyrethroids in a well-defined rural section of Pampa del Indio municipality (northeastern Argentina) over a 4-yr period. House infestation was assessed by timed manual searches, during insecticide applications, and by opportunistic householders' bug collections. All reinfested houses were selectively re-sprayed with insecticides. The resident population comprised Qom (66.6%) and Creole (33.4%) households, whose sociodemographic profiles differed substantially. The prevalence of house infestation dropped, less than expected, from 20.5% at baseline to 5.0% at 14 months postspraying (MPS), and then fluctuated between 0.8 and 4.2% over 21-51 MPS. Postspraying house infestation was positively and highly significantly associated with prespraying infestation. Most of the foci detected over 14-21 MPS were considered persistent (residual), some of which were moderately resistant to pyrethroids and were suppressed with malathion. Infestation patterns over 27-51 MPS suggested bug invasion from internal or external foci, but the sources of most findings were unaccounted for. Local spatial analysis identified two hotspots of postspraying house infestation. Using multimodel inference with model averaging, we corroborated that baseline domestic infestation was closely related to refuge availability, housing quality, and occurrence of peridomestic infestation. The diminished effectiveness of single pyrethroid treatments, partly attributable to moderate resistance compounded with rather insensitive vector detection methods and poor housing conditions, contributed to vector persistence. Improved control strategies combined with broad social participation are needed for the sustainable elimination of vector-borne human Chagas disease from the Gran Chaco. © The Authors 2017. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00222585_v54_n3_p646_Provecho |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Chagas disease Insecticide resistance Reinfestation Triatoma infestans Vector control insecticide pyrethroid animal Argentina growth, development and aging housing insect control insect vector insecticide resistance nymph physiology population dynamics Triatoma Animals Argentina Housing Insect Control Insect Vectors Insecticide Resistance Insecticides Nymph Population Dynamics Pyrethrins Triatoma |
| spellingShingle |
Chagas disease Insecticide resistance Reinfestation Triatoma infestans Vector control insecticide pyrethroid animal Argentina growth, development and aging housing insect control insect vector insecticide resistance nymph physiology population dynamics Triatoma Animals Argentina Housing Insect Control Insect Vectors Insecticide Resistance Insecticides Nymph Population Dynamics Pyrethrins Triatoma Provecho, Y.M. Sol Gaspe, M. Del Pilar Fernández, M. Gürtler, R.E. Byrd, J. House Reinfestation With Triatoma infestans (Hemiptera: Reduviidae) After Community-Wide Spraying With Insecticides in the Argentine Chaco: A Multifactorial Process |
| topic_facet |
Chagas disease Insecticide resistance Reinfestation Triatoma infestans Vector control insecticide pyrethroid animal Argentina growth, development and aging housing insect control insect vector insecticide resistance nymph physiology population dynamics Triatoma Animals Argentina Housing Insect Control Insect Vectors Insecticide Resistance Insecticides Nymph Population Dynamics Pyrethrins Triatoma |
| description |
We investigated the dynamics and underlying causes of house (re)infestation with Triatoma infestans (Klug 1834) after a community-wide residual spraying with pyrethroids in a well-defined rural section of Pampa del Indio municipality (northeastern Argentina) over a 4-yr period. House infestation was assessed by timed manual searches, during insecticide applications, and by opportunistic householders' bug collections. All reinfested houses were selectively re-sprayed with insecticides. The resident population comprised Qom (66.6%) and Creole (33.4%) households, whose sociodemographic profiles differed substantially. The prevalence of house infestation dropped, less than expected, from 20.5% at baseline to 5.0% at 14 months postspraying (MPS), and then fluctuated between 0.8 and 4.2% over 21-51 MPS. Postspraying house infestation was positively and highly significantly associated with prespraying infestation. Most of the foci detected over 14-21 MPS were considered persistent (residual), some of which were moderately resistant to pyrethroids and were suppressed with malathion. Infestation patterns over 27-51 MPS suggested bug invasion from internal or external foci, but the sources of most findings were unaccounted for. Local spatial analysis identified two hotspots of postspraying house infestation. Using multimodel inference with model averaging, we corroborated that baseline domestic infestation was closely related to refuge availability, housing quality, and occurrence of peridomestic infestation. The diminished effectiveness of single pyrethroid treatments, partly attributable to moderate resistance compounded with rather insensitive vector detection methods and poor housing conditions, contributed to vector persistence. Improved control strategies combined with broad social participation are needed for the sustainable elimination of vector-borne human Chagas disease from the Gran Chaco. © The Authors 2017. |
| format |
JOUR |
| author |
Provecho, Y.M. Sol Gaspe, M. Del Pilar Fernández, M. Gürtler, R.E. Byrd, J. |
| author_facet |
Provecho, Y.M. Sol Gaspe, M. Del Pilar Fernández, M. Gürtler, R.E. Byrd, J. |
| author_sort |
Provecho, Y.M. |
| title |
House Reinfestation With Triatoma infestans (Hemiptera: Reduviidae) After Community-Wide Spraying With Insecticides in the Argentine Chaco: A Multifactorial Process |
| title_short |
House Reinfestation With Triatoma infestans (Hemiptera: Reduviidae) After Community-Wide Spraying With Insecticides in the Argentine Chaco: A Multifactorial Process |
| title_full |
House Reinfestation With Triatoma infestans (Hemiptera: Reduviidae) After Community-Wide Spraying With Insecticides in the Argentine Chaco: A Multifactorial Process |
| title_fullStr |
House Reinfestation With Triatoma infestans (Hemiptera: Reduviidae) After Community-Wide Spraying With Insecticides in the Argentine Chaco: A Multifactorial Process |
| title_full_unstemmed |
House Reinfestation With Triatoma infestans (Hemiptera: Reduviidae) After Community-Wide Spraying With Insecticides in the Argentine Chaco: A Multifactorial Process |
| title_sort |
house reinfestation with triatoma infestans (hemiptera: reduviidae) after community-wide spraying with insecticides in the argentine chaco: a multifactorial process |
| url |
http://hdl.handle.net/20.500.12110/paper_00222585_v54_n3_p646_Provecho |
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