New structures for goat corrals to control peridomestic populations of Triatoma infestans (Hemiptera: Reduviidae) in the Gran Chaco of Argentina

Gorla, David Eladio; Abrahan, Luciana Beatriz; Hernández, María Laura; Porcasi, Ximena; Hrellac, H.; Carrizo, Hugo A.; Catalá, Silvia

doi:10.1590/s0074-02762013000300014

Cited by 24 publications

(17 citation statements)

References 17 publications

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“…For elimination purposes in high-risk areas such as the Gran Chaco, improved vector control at present should include full-coverage, professional application of a double dose of suspension concentrate pyrethroid insecticides to main peridomestic ecotopes and single (standard) doses to domiciles and other lower-quality habitats [13] , with additional re-treatment of key ecotopes at defined time intervals. For more sustainable vector and disease control, however, improved vector control needs to be combined with long-term investment in improved housing and appropriate animal husbandry [4] , [6] , [73] , [75] in the frame of broad social participation and education.…”

Section: Discussionmentioning

confidence: 99%

Key Source Habitats and Potential Dispersal of Triatoma infestans Populations in Northwestern Argentina: Implications for Vector Control

et al. 2014

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Background Triatoma infestans —the principal vector of the infection that causes Chagas disease— defies elimination efforts in the Gran Chaco region. This study identifies the types of human-made or -used structures that are key sources of these bugs in the initial stages of house reinfestation after an insecticide spraying campaign.Methodology and Principal FindingsWe measured demographic and blood-feeding parameters at two geographic scales in 11 rural communities in Figueroa, northwest Argentina. Of 1,297 sites searched in spring, 279 (21.5%) were infested. Bug abundance per site and female fecundity differed significantly among habitat types (ecotopes) and were highly aggregated. Domiciles (human sleeping quarters) had maximum infestation prevalence (38.7%), human-feeding bugs and total egg production, with submaximal values for other demographic and blood-feeding attributes. Taken collectively peridomestic sites were three times more often infested than domiciles. Chicken coops had greater bug abundance, blood-feeding rates, engorgement status, and female fecundity than pig and goat corrals. The host-feeding patterns were spatially structured yet there was strong evidence of active dispersal of late-stage bugs between ecotopes. Two flight indices predicted that female fliers were more likely to originate from kitchens and domiciles, rejecting our initial hypothesis that goat and pig corrals would dominate.Conclusions and SignificanceChicken coops and domiciles were key source habitats fueling rapid house reinfestation. Focusing control efforts on ecotopes with human-fed bugs (domiciles, storerooms, goat corrals) would neither eliminate the substantial contributions to bug population growth from kitchens, chicken coops, and pig corrals nor stop dispersal of adult female bugs from kitchens. Rather, comprehensive control of the linked network of ecotopes is required to prevent feeding on humans, bug population growth, and bug dispersal simultaneously. Our study illustrates a demographic approach that may be applied to other regions and triatomine species for the design of innovative, improved vector control strategies.

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Section: Discussionmentioning

confidence: 99%

Key Source Habitats and Potential Dispersal of Triatoma infestans Populations in Northwestern Argentina: Implications for Vector Control

et al. 2014

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“…Regarding (i), the presence of residual foci of T. infestans can be inferred from the coincidence of sites persistently infested before and after insecticide sprays, mainly occurring in large, structurally complex peridomestic structures such as goat corrals 27,30 . Some of the residual foci detected indoors may likely be due to insufficient mobilization of household goods, bags and other objects at the time of insecticide application.…”

Section: Discussionmentioning

confidence: 99%

“…Searches for improved control strategies of triatomines included biological 42 , socio-cultural 43 , environmental management 30 , and technical aspects of insecticide applications 44,45 . The VMS was slightly faster than MCS indoors and was not affected by some limitations (sensu 12 ) of the MCS, such as the imprecision of the manometer, and the need to pump several times during spraying to maintain the pressure between 40 and 60kPa.…”

Section: Discussionmentioning

confidence: 99%

A motorized vehicle-mounted sprayer as a new tool for Chagas disease vector control

Carbajal-de-la-Fuente

Lencina

Spillmann

et al. 2017

Cad. Saúde Pública

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Residual insecticide spraying still is the main tool used to suppress house infestations with Chagas disease vectors. While manual compression sprayers (MCS) have traditionally been used in Latin America, Mendoza's vector control program from Argentina introduced the use of a modified motorized vehicle-mounted sprayer (VMS) with apparent advantages over MCS. We conducted a randomized intervention trial to evaluate the effectiveness and selected components of the performance of MCS and VMS. We assessed house infestation by Triatoma infestans in 76 previously-infested houses at 0, 1, 4 and 12 months postintervention. Infestations were reduced substantially, with no significant differences between treatments. End-point infestations were restricted to peridomiciles. Although VMS required less time to complete the house spraying than MCS, both treatments had similar performance and did not suppress infestations completely. The main relative advantages of VMS were a reduced physical effort, especially under harsh field conditions, and potential gains in spray coverage per unit of time.

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“…Rural areas within the Gran Chaco have been the target of several studies related to the identification of these risk factors, such as houses with adobe and/or cracked walls, dirt fl oors, thatched roofs, precarious hygienic conditions, easy access to food supplies, and dogs and chickens sleeping inside or near the house. The presence of these factors increases the risk of triatomine infestation in these rural areas 11,12 . In addition, several studies indicate that the structural characteristics of the peridomiciliary annexes, such as the materials used for construction 13,14 , as well as housing proximity 15 , pose different risk levels of re-infestation of houses 16,17 , which make control actions more difficult to complete. The persistence of T. infestans in this region might be caused by the important role of peridomiciles as the main source of indoor re-infestation 6,18,19 .…”

Section: Introductionmentioning

confidence: 99%

Factors associated with the presence of triatomines in rural areas of south Argentine Chaco

Crocco

Nattero

López

et al. 2019

Rev. Soc. Bras. Med. Trop.

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Introduction: The domestic and peridomestic presence of Triatoma infestans depends on several factors, such as human behavior, vector behavior, ecology, and the environment. Methods: This work was conducted in 139 domiciliary units, where triatomines were captured and risk factors in domiciles and peridomicilies were recorded. Household dwellers were interviewed to obtain information about practices regarding this disease and entomological indicators were calculated. Results: Infestation indices were 59.7% for house compounds, 4.3% for domestic areas and 58.3% for the peridomestic areas. Intradomicile infestation was significantly associated with housing characteristics. The presence of chicken coops in peridomicilies was associated with an increased risk of infestation. Of the respondents, 80% did not recognize the importance of the peridomiciliary structures for triatomine control and had infested peridomicilies. Conclusions: The results show the importance of peridomiciles as refuge sites for Triatominae bugs; however, household dwellers do not perceive peridomiciles as areas that favor the presence of vectors. Actions for raising awareness about factors that favor the presence of triatomines are needed to improve the conditions of peridomiciliary environments.

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New structures for goat corrals to control peridomestic populations of Triatoma infestans (Hemiptera: Reduviidae) in the Gran Chaco of Argentina

Abstract: Goat production is an important economic activity for rural communities in the Gran

Cited by 24 publications

References 17 publications

Key Source Habitats and Potential Dispersal of Triatoma infestans Populations in Northwestern Argentina: Implications for Vector Control

Key Source Habitats and Potential Dispersal of Triatoma infestans Populations in Northwestern Argentina: Implications for Vector Control

A motorized vehicle-mounted sprayer as a new tool for Chagas disease vector control

Factors associated with the presence of triatomines in rural areas of south Argentine Chaco

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