Where do these bugs come from? Phenotypic structure of triatoma infestans populations after control interventions in the Argentine Chaco
House re-invasion by native triatomines after insecticide-based control campaigns represents a major threat for Chagas disease vector control. We conducted a longitudinal intervention study in a rural section (Area III, 407 houses) of Pampa del Indio, northeastern Argentina, and used wing geometric...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00740276_v110_n3_p310_Gaspe |
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todo:paper_00740276_v110_n3_p310_Gaspe2023-10-03T14:53:40Z Where do these bugs come from? Phenotypic structure of triatoma infestans populations after control interventions in the Argentine Chaco Gaspe, M.S. Provecho, Y.M. Piccinali, R.V. Gürtler, R.E. Geometric morphometry Gran Chaco Re-infestation Triatoma infestans Vector control Hexapoda Triatoma infestans insecticide pyrethroid anatomy and histology animal Argentina Chagas disease drug effects female insect control insect vector longitudinal study male procedures rural population transmission Triatoma wing Animals Argentina Chagas Disease Female Insect Control Insect Vectors Insecticides Longitudinal Studies Male Pyrethrins Rural Population Triatoma Wings, Animal House re-invasion by native triatomines after insecticide-based control campaigns represents a major threat for Chagas disease vector control. We conducted a longitudinal intervention study in a rural section (Area III, 407 houses) of Pampa del Indio, northeastern Argentina, and used wing geometric morphometry to compare pre-spray and post-spray (re-infestant bugs) Triatoma infestans populations. The community-wide spraying with pyrethroids reduced the prevalence of house infestation by T. infestans from 31.9% to < 1% during a four-year follow-up, unlike our previous studies in the neighbouring Area I. Two groups of bug collection sites differing in wing shape variables before interventions (including 221 adults from 11 domiciles) were used as a reference for assigning 44 post-spray adults. Wing shape variables from post-spray, high-density bug colonies and pre-spray groups were significantly different, suggesting that re-infestant insects had an external origin. Insects from one house differed strongly in wing shape variables from all other specimens. A further comparison between insects from both areas supported the existence of independent re-infestation processes within the same district. These results point to local heterogeneities in house re-infestation dynamics and emphasise the need to expand the geographic coverage of vector surveillance and control operations to the affected region. © 2015, Fundacao Oswaldo Cruz. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00740276_v110_n3_p310_Gaspe |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Geometric morphometry Gran Chaco Re-infestation Triatoma infestans Vector control Hexapoda Triatoma infestans insecticide pyrethroid anatomy and histology animal Argentina Chagas disease drug effects female insect control insect vector longitudinal study male procedures rural population transmission Triatoma wing Animals Argentina Chagas Disease Female Insect Control Insect Vectors Insecticides Longitudinal Studies Male Pyrethrins Rural Population Triatoma Wings, Animal |
| spellingShingle |
Geometric morphometry Gran Chaco Re-infestation Triatoma infestans Vector control Hexapoda Triatoma infestans insecticide pyrethroid anatomy and histology animal Argentina Chagas disease drug effects female insect control insect vector longitudinal study male procedures rural population transmission Triatoma wing Animals Argentina Chagas Disease Female Insect Control Insect Vectors Insecticides Longitudinal Studies Male Pyrethrins Rural Population Triatoma Wings, Animal Gaspe, M.S. Provecho, Y.M. Piccinali, R.V. Gürtler, R.E. Where do these bugs come from? Phenotypic structure of triatoma infestans populations after control interventions in the Argentine Chaco |
| topic_facet |
Geometric morphometry Gran Chaco Re-infestation Triatoma infestans Vector control Hexapoda Triatoma infestans insecticide pyrethroid anatomy and histology animal Argentina Chagas disease drug effects female insect control insect vector longitudinal study male procedures rural population transmission Triatoma wing Animals Argentina Chagas Disease Female Insect Control Insect Vectors Insecticides Longitudinal Studies Male Pyrethrins Rural Population Triatoma Wings, Animal |
| description |
House re-invasion by native triatomines after insecticide-based control campaigns represents a major threat for Chagas disease vector control. We conducted a longitudinal intervention study in a rural section (Area III, 407 houses) of Pampa del Indio, northeastern Argentina, and used wing geometric morphometry to compare pre-spray and post-spray (re-infestant bugs) Triatoma infestans populations. The community-wide spraying with pyrethroids reduced the prevalence of house infestation by T. infestans from 31.9% to < 1% during a four-year follow-up, unlike our previous studies in the neighbouring Area I. Two groups of bug collection sites differing in wing shape variables before interventions (including 221 adults from 11 domiciles) were used as a reference for assigning 44 post-spray adults. Wing shape variables from post-spray, high-density bug colonies and pre-spray groups were significantly different, suggesting that re-infestant insects had an external origin. Insects from one house differed strongly in wing shape variables from all other specimens. A further comparison between insects from both areas supported the existence of independent re-infestation processes within the same district. These results point to local heterogeneities in house re-infestation dynamics and emphasise the need to expand the geographic coverage of vector surveillance and control operations to the affected region. © 2015, Fundacao Oswaldo Cruz. All rights reserved. |
| format |
JOUR |
| author |
Gaspe, M.S. Provecho, Y.M. Piccinali, R.V. Gürtler, R.E. |
| author_facet |
Gaspe, M.S. Provecho, Y.M. Piccinali, R.V. Gürtler, R.E. |
| author_sort |
Gaspe, M.S. |
| title |
Where do these bugs come from? Phenotypic structure of triatoma infestans populations after control interventions in the Argentine Chaco |
| title_short |
Where do these bugs come from? Phenotypic structure of triatoma infestans populations after control interventions in the Argentine Chaco |
| title_full |
Where do these bugs come from? Phenotypic structure of triatoma infestans populations after control interventions in the Argentine Chaco |
| title_fullStr |
Where do these bugs come from? Phenotypic structure of triatoma infestans populations after control interventions in the Argentine Chaco |
| title_full_unstemmed |
Where do these bugs come from? Phenotypic structure of triatoma infestans populations after control interventions in the Argentine Chaco |
| title_sort |
where do these bugs come from? phenotypic structure of triatoma infestans populations after control interventions in the argentine chaco |
| url |
http://hdl.handle.net/20.500.12110/paper_00740276_v110_n3_p310_Gaspe |
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