Susceptibility characterization of residual Brazilian populations of Triatoma infestans Klug, 1834 (Hemiptera: Reduviidae) to deltamethrin pyrethroid

Pessoa, Grasielle Caldas D’Ávila; Rosa, Aline Cristine Luiz; Bedin, Cleonara; Wilhelms, Tania Stasiak; Mello, Fernanda Bastos de; Coutinho, Helder Silveira; Fonseca, Eduardo Oyama Lins; Santos, Roberto Fonseca dos; Diotaiuti, Liléia

doi:10.1590/0037-8682-0011-2015

Cited by 12 publications

(11 citation statements)

References 33 publications

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“…We observed house-invading P. megistus in few residences, and T. infestans occurred in one municipality in our study (Novo Horizonte); T. infestans were also recorded in other two municipalities in Bahia in the last years (Ibipeba and Tremedal) [15, 30, 31]. These results show the success in controlling domestic triatomines with the virtual elimination of T. infestans in Bahia municipalities [32, 33].…”

Section: Discussionsupporting

confidence: 60%

Wide distribution of Trypanosoma cruzi-infected triatomines in the State of Bahia, Brazil

et al. 2019

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BackgroundThe identification of Trypanosoma cruzi and blood-meal sources in synanthropic triatomines is important to assess the potential risk of Chagas disease transmission. We identified T. cruzi infection and blood-meal sources of triatomines caught in and around houses in the state of Bahia, northeastern Brazil, and mapped the occurrence of infected triatomines that fed on humans and domestic animals.MethodsTriatominae bugs were manually captured by trained agents from the Epidemiologic Surveillance team of Bahia State Health Service between 2013 and 2014. We applied conventional PCR to detect T. cruzi and blood-meal sources (dog, cat, human and bird) in a randomized sample of triatomines. We mapped triatomine distribution and analyzed vector hotspots with kernel density spatial analysis.ResultsIn total, 5906 triatomines comprising 15 species were collected from 127 out of 417 municipalities in Bahia. The molecular analyses of 695 triatomines revealed a ~10% T. cruzi infection rate, which was highest in the T. brasiliensis species complex. Most bugs were found to have fed on birds (74.2%), and other blood-meal sources included dogs (6%), cats (0.6%) and humans (1%). Trypanosoma cruzi-infected triatomines that fed on humans were detected inside houses. Spatial analysis showed a wide distribution of T. cruzi-infected triatomines throughout Bahia; triatomines that fed on dogs, humans, and cats were observed mainly in the northeast region.ConclusionsSynanthropic triatomines have a wide distribution and maintain the potential risk of T. cruzi transmission to humans and domestic animals in Bahia. Ten species were recorded inside houses, mainly Triatoma sordida, T. pseudomaculata, and the T. brasiliensis species complex. Molecular and spatial analysis are useful to reveal T. cruzi infection and blood-meal sources in synanthropic triatomines, identifying areas with ongoing threat for parasite transmission and improving entomological surveillance strategies.

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Section: Discussionsupporting

confidence: 60%

Wide distribution of Trypanosoma cruzi-infected triatomines in the State of Bahia, Brazil

et al. 2019

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“…With respect to spraying, it has been reported that insect resistance to the chemical treatment employed (pyrethroid insecticides such as alpha-cypermethrin and deltamethrin) was not observed. In addition, Pessoa et al (2015) 14 and Belisário et al (2017) 15 demonstrated that the specimens of T. infestans strong genetic structure and little to no gene flow among populations, from the states of Bahia and RS, collected precisely in Santa Rosa and Doutor Maurício Cardoso. These municipalities, together with Santo Cristo, exhibited the last foci of T. infestans in this investigation and were susceptible to pyrethroid insecticide deltamethrin in laboratory tests, corroborating our field observations.…”

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confidence: 99%

Residual foci of Triatoma infestans infestation: Surveillance and control in Rio Grande do Sul, Brazil, 2001-2018

Bedin

Wilhelms

Villela

et al. 2021

Rev. Soc. Bras. Med. Trop.

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Introduction: This retrospective study conducted from 2001 to 2018 investigated the residual foci of Triatoma infestans infestation in Rio Grande do Sul, Brazil. Methods: The data were obtained via entomological surveillance and the distribution of vector occurrence. The coverage of active research was mapped. Results: The largest coverage rate for active research was observed in the northwest region of the total of 515,081 domiciles researched. Most T. infestans specimens were captured in the peridomicile. Conclusions: Infestation has decreased significantly since 2008, and T. infestans has not been captured since 2015.

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“…However, the different toxicological profi les of deltamethrin in T. sordida populations from distinct locations in the same municipality (e.g., Frutal/Guilherme F. Correa and Frutal/ Aureliano N. Cruz), showed the complexity of the resistance phenotype, at both macro-and microgeographical levels, as observed by Pessoa et al (16) in their studies of Brazilian T. infestans populations from Rio Grande do Sul. They observed that deltamethrin does not present homogenous effects over different populations from the same locality, suggesting independent selection pressure.…”

Section: Ethical Considerationsmentioning

confidence: 77%

Variability of susceptibility to deltamethrin in peridomestic Triatoma sordida from Triângulo Mineiro, State of Minas Gerais, Brazil

Pessoa

Santos

Salazar

et al. 2015

Rev. Soc. Bras. Med. Trop.

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Introduction: Despite chemical and physical vector control strategies, persistent infestations of Triatoma sordida have been reported in a large part of Minas Gerais, Brazil, and the cause for this is little investigated. We aimed to characterize the deltamethrin toxicological profi le in peridomestic T. sordida populations from Triângulo Mineiro area of Minas Gerais. Methods: Susceptibility to deltamethrin was assessed in seventeen peridomestic T. sordida populations. Serial dilutions of deltamethrin in acetone (0.2µL) were topically applied on the fi rst instar nymphs (F1; fi ve days old; fasting weight, 1.2 ± 0.2mg). Dose response results were analyzed using Probit software, and the lethal doses, slope and resistance ratios were determined. Qualitative tests were also performed. Results: The deltamethrin susceptibility profi le of T. sordida populations revealed resistance ratios ranging from 0.84 to 2.8. The percentage mortality in response to a diagnostic dose was 100.0% in all populations. Conclusions: From our results, the lack of resistance to insecticides but persistent T. sordida infestations in the Triângulo Mineiro area may be because of: 1) environmental degradation facilitating dispersion of T. sordida, allowing colonization in artifi cial ecotopes; 2) operational failures; and 3) complexity of the peridomicile in the study area.These variables are being investigated.

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Susceptibility characterization of residual Brazilian populations of Triatoma infestans Klug, 1834 (Hemiptera: Reduviidae) to deltamethrin pyrethroid

Cited by 12 publications

References 33 publications

Wide distribution of Trypanosoma cruzi-infected triatomines in the State of Bahia, Brazil

Wide distribution of Trypanosoma cruzi-infected triatomines in the State of Bahia, Brazil

Residual foci of Triatoma infestans infestation: Surveillance and control in Rio Grande do Sul, Brazil, 2001-2018

Variability of susceptibility to deltamethrin in peridomestic Triatoma sordida from Triângulo Mineiro, State of Minas Gerais, Brazil

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