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Abstract:

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.

Registro:

Documento: Artículo
Título:House Reinfestation With Triatoma infestans (Hemiptera: Reduviidae) After Community-Wide Spraying With Insecticides in the Argentine Chaco: A Multifactorial Process
Autor:Provecho, Y.M.; Sol Gaspe, M.; Del Pilar Fernández, M.; Gürtler, R.E.; Byrd, J.
Filiación:Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Ecología Genética y Evolución de Buenos Aires (IEGEBA), Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
Palabras clave: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
Año:2017
Volumen:54
Número:3
Página de inicio:646
Página de fin:657
DOI: http://dx.doi.org/10.1093/jme/tjw224
Título revista:Journal of Medical Entomology
Título revista abreviado:J. Med. Entomol.
ISSN:00222585
CODEN:JMENA
CAS:Insecticides; Pyrethrins
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00222585_v54_n3_p646_Provecho

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Citas:

---------- APA ----------
Provecho, Y.M., Sol Gaspe, M., Del Pilar Fernández, M., Gürtler, R.E. & Byrd, J. (2017) . House Reinfestation With Triatoma infestans (Hemiptera: Reduviidae) After Community-Wide Spraying With Insecticides in the Argentine Chaco: A Multifactorial Process. Journal of Medical Entomology, 54(3), 646-657.
http://dx.doi.org/10.1093/jme/tjw224
---------- CHICAGO ----------
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" . Journal of Medical Entomology 54, no. 3 (2017) : 646-657.
http://dx.doi.org/10.1093/jme/tjw224
---------- MLA ----------
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" . Journal of Medical Entomology, vol. 54, no. 3, 2017, pp. 646-657.
http://dx.doi.org/10.1093/jme/tjw224
---------- VANCOUVER ----------
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. J. Med. Entomol. 2017;54(3):646-657.
http://dx.doi.org/10.1093/jme/tjw224