Hidden sylvatic foci of the main vector of Chagas disease Triatoma infestans: threats to the vector elimination campaign?
Background Establishing the sources of reinfestation after residual insecticide spraying is crucial for vector elimination programs. Triatoma infestans, traditionally considered to be limited to domestic or peridomestic (abbreviated as D/PD) habitats throughout most of its range, is the target of an...
Published in: | PLoS Neglected Tropical Diseases |
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2011
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ftdoajarticles:oai:doaj.org/article:1c0406ed63b048ab99a0de52317a7c97 2023-05-15T15:15:13+02:00 Hidden sylvatic foci of the main vector of Chagas disease Triatoma infestans: threats to the vector elimination campaign? Leonardo A Ceballos Romina V Piccinali Paula L Marcet Gonzalo M Vazquez-Prokopec M Victoria Cardinal Judith Schachter-Broide Jean-Pierre Dujardin Ellen M Dotson Uriel Kitron Ricardo E Gürtler 2011-10-01T00:00:00Z https://doi.org/10.1371/journal.pntd.0001365 https://doaj.org/article/1c0406ed63b048ab99a0de52317a7c97 EN eng Public Library of Science (PLoS) https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22039559/?tool=EBI https://doaj.org/toc/1935-2727 https://doaj.org/toc/1935-2735 1935-2727 1935-2735 doi:10.1371/journal.pntd.0001365 https://doaj.org/article/1c0406ed63b048ab99a0de52317a7c97 PLoS Neglected Tropical Diseases, Vol 5, Iss 10, p e1365 (2011) Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 article 2011 ftdoajarticles https://doi.org/10.1371/journal.pntd.0001365 2022-12-31T08:00:23Z Background Establishing the sources of reinfestation after residual insecticide spraying is crucial for vector elimination programs. Triatoma infestans, traditionally considered to be limited to domestic or peridomestic (abbreviated as D/PD) habitats throughout most of its range, is the target of an elimination program that has achieved limited success in the Gran Chaco region in South America. Methodology/principal findings During a two-year period we conducted semi-annual searches for triatomine bugs in every D/PD site and surrounding sylvatic habitats after full-coverage spraying of pyrethroid insecticides of all houses in a well-defined rural area in northwestern Argentina. We found six low-density sylvatic foci with 24 T. infestans in fallen or standing trees located 110-2,300 m from the nearest house or infested D/PD site detected after insecticide spraying, when house infestations were rare. Analysis of two mitochondrial gene fragments of 20 sylvatic specimens confirmed their species identity as T. infestans and showed that their composite haplotypes were the same as or closely related to D/PD haplotypes. Population studies with 10 polymorphic microsatellite loci and wing geometric morphometry consistently indicated the occurrence of unrestricted gene flow between local D/PD and sylvatic populations. Mitochondrial DNA and microsatellite sibship analyses in the most abundant sylvatic colony revealed descendents from five different females. Spatial analysis showed a significant association between two sylvatic foci and the nearest D/PD bug population found before insecticide spraying. Conclusions Our study shows that, despite of its high degree of domesticity, T. infestans has sylvatic colonies with normal chromatic characters (not melanic morphs) highly connected to D/PD conspecifics in the Argentinean Chaco. Sylvatic habitats may provide a transient or permanent refuge after control interventions, and function as sources for D/PD reinfestation. The occurrence of sylvatic foci of T. infestans in the Gran ... Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Argentina Chaco ENVELOPE(-60.583,-60.583,-63.033,-63.033) PLoS Neglected Tropical Diseases 5 10 e1365 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 |
spellingShingle |
Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 Leonardo A Ceballos Romina V Piccinali Paula L Marcet Gonzalo M Vazquez-Prokopec M Victoria Cardinal Judith Schachter-Broide Jean-Pierre Dujardin Ellen M Dotson Uriel Kitron Ricardo E Gürtler Hidden sylvatic foci of the main vector of Chagas disease Triatoma infestans: threats to the vector elimination campaign? |
topic_facet |
Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 |
description |
Background Establishing the sources of reinfestation after residual insecticide spraying is crucial for vector elimination programs. Triatoma infestans, traditionally considered to be limited to domestic or peridomestic (abbreviated as D/PD) habitats throughout most of its range, is the target of an elimination program that has achieved limited success in the Gran Chaco region in South America. Methodology/principal findings During a two-year period we conducted semi-annual searches for triatomine bugs in every D/PD site and surrounding sylvatic habitats after full-coverage spraying of pyrethroid insecticides of all houses in a well-defined rural area in northwestern Argentina. We found six low-density sylvatic foci with 24 T. infestans in fallen or standing trees located 110-2,300 m from the nearest house or infested D/PD site detected after insecticide spraying, when house infestations were rare. Analysis of two mitochondrial gene fragments of 20 sylvatic specimens confirmed their species identity as T. infestans and showed that their composite haplotypes were the same as or closely related to D/PD haplotypes. Population studies with 10 polymorphic microsatellite loci and wing geometric morphometry consistently indicated the occurrence of unrestricted gene flow between local D/PD and sylvatic populations. Mitochondrial DNA and microsatellite sibship analyses in the most abundant sylvatic colony revealed descendents from five different females. Spatial analysis showed a significant association between two sylvatic foci and the nearest D/PD bug population found before insecticide spraying. Conclusions Our study shows that, despite of its high degree of domesticity, T. infestans has sylvatic colonies with normal chromatic characters (not melanic morphs) highly connected to D/PD conspecifics in the Argentinean Chaco. Sylvatic habitats may provide a transient or permanent refuge after control interventions, and function as sources for D/PD reinfestation. The occurrence of sylvatic foci of T. infestans in the Gran ... |
format |
Article in Journal/Newspaper |
author |
Leonardo A Ceballos Romina V Piccinali Paula L Marcet Gonzalo M Vazquez-Prokopec M Victoria Cardinal Judith Schachter-Broide Jean-Pierre Dujardin Ellen M Dotson Uriel Kitron Ricardo E Gürtler |
author_facet |
Leonardo A Ceballos Romina V Piccinali Paula L Marcet Gonzalo M Vazquez-Prokopec M Victoria Cardinal Judith Schachter-Broide Jean-Pierre Dujardin Ellen M Dotson Uriel Kitron Ricardo E Gürtler |
author_sort |
Leonardo A Ceballos |
title |
Hidden sylvatic foci of the main vector of Chagas disease Triatoma infestans: threats to the vector elimination campaign? |
title_short |
Hidden sylvatic foci of the main vector of Chagas disease Triatoma infestans: threats to the vector elimination campaign? |
title_full |
Hidden sylvatic foci of the main vector of Chagas disease Triatoma infestans: threats to the vector elimination campaign? |
title_fullStr |
Hidden sylvatic foci of the main vector of Chagas disease Triatoma infestans: threats to the vector elimination campaign? |
title_full_unstemmed |
Hidden sylvatic foci of the main vector of Chagas disease Triatoma infestans: threats to the vector elimination campaign? |
title_sort |
hidden sylvatic foci of the main vector of chagas disease triatoma infestans: threats to the vector elimination campaign? |
publisher |
Public Library of Science (PLoS) |
publishDate |
2011 |
url |
https://doi.org/10.1371/journal.pntd.0001365 https://doaj.org/article/1c0406ed63b048ab99a0de52317a7c97 |
long_lat |
ENVELOPE(-60.583,-60.583,-63.033,-63.033) |
geographic |
Arctic Argentina Chaco |
geographic_facet |
Arctic Argentina Chaco |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
PLoS Neglected Tropical Diseases, Vol 5, Iss 10, p e1365 (2011) |
op_relation |
https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22039559/?tool=EBI https://doaj.org/toc/1935-2727 https://doaj.org/toc/1935-2735 1935-2727 1935-2735 doi:10.1371/journal.pntd.0001365 https://doaj.org/article/1c0406ed63b048ab99a0de52317a7c97 |
op_doi |
https://doi.org/10.1371/journal.pntd.0001365 |
container_title |
PLoS Neglected Tropical Diseases |
container_volume |
5 |
container_issue |
10 |
container_start_page |
e1365 |
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1766345596298330112 |