Impacts of residual insecticide spraying on the abundance and habitat occupancy of Triatoma sordida and co-occurrence with Triatoma infestans: A three-year follow-up in northeastern Argentina

Rodríguez-Planes, Lucía I.; Gaspe, María Sol; Enriquez, Gustavo Fabián; Gürtler, Ricardo E.

doi:10.1016/j.actatropica.2019.105251

Cited by 11 publications

(14 citation statements)

References 67 publications

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“…Some sylvatic triatomine species may colonize peridomestic habitats and contributed to domestic transmission of T. cruzi elsewhere, as with Triatoma eratyrusiformis in sub-Andean Argentina [65] and T. sordida, T. pseudomaculata, and T. brasiliensis in Bahia, Brazil [66]. In our study area, however, householders' surveillance efforts revealed the occasional invasion of domiciles by adult T. sordida, and more rarely by Panstrongylus geniculatus [27,67]. Their role as secondary vectors of T. cruzi to humans in Pampa del Indio appears to be marginal, if any.…”

Section: Plos Neglected Tropical Diseasesmentioning

confidence: 66%

“…In our study area, however, householders’ surveillance efforts revealed the occasional invasion of domiciles by adult T . sordida , and more rarely by Panstrongylus geniculatus [ 27 , 67 ]. Their role as secondary vectors of T .…”

Section: Discussionmentioning

confidence: 99%

“…The local T . sordida populations (member of a species complex differing in several traits relevant to tendency toward domesticity and transmission) were tightly associated with chickens in peridomestic habitats and failed to colonize human sleeping quarters before or after interventions in Area I and III [ 27 , 67 ]. The baseline prevalence of T .…”

Section: Discussionmentioning

confidence: 99%

“…Their role as secondary vectors of T. cruzi to humans in Pampa del Indio appears to be marginal, if any. The local T. sordida populations (member of a species complex differing in several traits relevant to tendency toward domesticity and transmission) were tightly associated with chickens in peridomestic habitats and failed to colonize human sleeping quarters before or after interventions in Area I and III [27,67]. The baseline prevalence of T. cruzi infection in peridomestic T. sordida in Area I (2% by optic microscopy and 6% by kDNA-PCR) remained unchanged slightly after community-wide insecticide spraying [58].…”

Section: Plos Neglected Tropical Diseasesmentioning

confidence: 99%

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Long-term impact of a ten-year intervention program on human and canine Trypanosoma cruzi infection in the Argentine Chaco

et al. 2021

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Background Interruption of domestic vector-borne transmission of Trypanosoma cruzi is still an unmet goal in several American countries. In 2007 we launched a long-term intervention program aimed to suppress house infestation with the main domestic vector in southern South America (Triatoma infestans) and domestic transmission in Pampa del Indio, a resource-constrained, hyperendemic municipality with 1446 rural houses inhabited by Creole and indigenous people, in the Argentine Chaco ecoregion. Here, we assessed whether the 10-year insecticide-based program combined with community mobilization blocked vector-borne domestic transmission of T. cruzi to humans and dogs. Methods We carried out two municipality-wide, cross-sectional serosurveys of humans and dogs (considered sentinel animals) during 2016–2017 to compare with baseline data. We used a risk-stratified random sampling design to select 273 study houses; 410 people from 180 households and 492 dogs from 151 houses were examined for antibodies to T. cruzi using at least two serological methods. Results The seroprevalence of T. cruzi in children aged <16 years was 2.5% in 2017 (i.e., 4- to 11-fold lower than before interventions). The mean annual force of child infection (λ) sharply decreased from 2.18 to 0.34 per 100 person-years in 2017. One of 102 children born after interventions was seropositive for T. cruzi; he had lifetime residence in an apparently uninfested house, no outside travel history, and his mother was T. cruzi-seropositive. No incident case was detected among 114 seronegative people of all ages re-examined serologically. Dog seroprevalence was 3.05%. Among native dogs, λ in 2016 (1.21 per 100 dog-years) was 5 times lower than at program onset. Six native adult dogs born after interventions and with stable lifetime residence were T. cruzi-seropositive: three had exposure to T. infestans at their houses and one was an incident case. Conclusions These results support the interruption of vector-borne transmission of T. cruzi to humans in rural Pampa del Indio. Congenital transmission was the most likely source of the only seropositive child born after interventions. Residual transmission to dogs was likely related to transient infestations and other transmission routes. Sustained vector control supplemented with human chemotherapy can lead to a substantial reduction of Chagas disease transmission in the Argentine Chaco.

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Section: Plos Neglected Tropical Diseasesmentioning

confidence: 66%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Plos Neglected Tropical Diseasesmentioning

confidence: 99%

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Long-term impact of a ten-year intervention program on human and canine Trypanosoma cruzi infection in the Argentine Chaco

et al. 2021

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“…In this study, no differences in the death odds-ratios were identified. All odds-ratios were combined to a single value and tested using the Cochran-Mantel-Haenszel (CMH) test statistic for comparing the odds of death for homozygous and heterozygous resistant genotypes [23,24]. The impact of the factors, area, genotype, distance and cage on the probability of survival of the mosquitoes was assessed through a logistic regression model.…”

Section: Statistical Analysesmentioning

confidence: 99%

Detection of the Nav channel kdr-like mutation and modeling of factors affecting survivorship of Culex quinquefasciatus mosquitoes from six areas of Harris County (Houston), Texas, after permethrin field-cage tests

et al. 2020

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Culex quinquefasciatus is one of the most important mosquito vectors of arboviruses. Currently, the fastest approach to control disease transmission is the application of synthetic adulticide insecticides. However, in highly populated urban centers the development of insecticide resistance in mosquito populations could impair insecticide efficacy and therefore, disease control. To assess the effect of resistance on vector control, females of Cx. quinquefasciatus collected from six mosquito control operational areas in Harris County, Texas, were treated in field cage tests at three different distances with the pyrethroid Permanone® 31–66 applied at the operational rate. Females were analyzed by sequencing and/or diagnostic PCR using de novo designed primers for detecting the kdr-like mutation in the voltage-gated sodium channel (L982F; TTA to TTT) (house fly kdr canonical mutation L1014F). Females from the Cx. quinquefasciatus susceptible Sebring strain and those from the six operational areas placed at 30.4 m from the treatment source were killed in the tests, while 14% of field-collected mosquitoes survived at 60.8 m, and 35% at 91.2 m from the source. The diagnostic PCR had a with 97.5% accuracy to detect the kdr-like mutation. Pyrethroid resistant mosquitoes carrying the L982F mutation were broadly distributed in Harris County at high frequency. Among mosquitoes analyzed (n = 1,028), the kdr-kdr genotype was prevalent (81.2%), the kdr-s genotype was 18%, and s-s mosquitoes were less than 1% (n = 8). A logistic regression model estimated an equal probability of survival for the genotypes kdr-kdr and kdr-s in all areas analyzed. Altogether, our results point to a high-risk situation for the pyrethroid-based arboviral disease control in Harris County.

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Eco-Epidemiology of Vector-Borne Transmission of Trypanosoma cruzi in Domestic Habitats

Gürtler

Fernández

Cardinal

2021

Entomology in Focus

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Impacts of residual insecticide spraying on the abundance and habitat occupancy of Triatoma sordida and co-occurrence with Triatoma infestans: A three-year follow-up in northeastern Argentina

Cited by 11 publications

References 67 publications

Long-term impact of a ten-year intervention program on human and canine Trypanosoma cruzi infection in the Argentine Chaco

Long-term impact of a ten-year intervention program on human and canine Trypanosoma cruzi infection in the Argentine Chaco

Detection of the Nav channel kdr-like mutation and modeling of factors affecting survivorship of Culex quinquefasciatus mosquitoes from six areas of Harris County (Houston), Texas, after permethrin field-cage tests

Eco-Epidemiology of Vector-Borne Transmission of Trypanosoma cruzi in Domestic Habitats

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