Aspectos ecológicos da tripanossomíase americana: XIV - Persistência e potencial de domiciliação de populações triatomínicas silvestres em região de intensa atividade agropecuária

Forattini, Oswaldo Paulo; Ferreira, Octávio Alves; Silva, Eduardo Olavo da Rocha e; Rabello, Ernesto Xavier

doi:10.1590/s0034-89101979000200009

Cited by 23 publications

(19 citation statements)

References 9 publications

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“…Na casuística amazônica, nos casos isolados de suposta transmissão silvestre, as condições de moradia, especialmente casas da zona rural construídas em madeira e telha em áreas de várzea, demonstram a provável exposição dos indivíduos estudados ao contato com vetores peridomiciliares, já relatados na Amazônia 29 . Em área periurbana e urbana, as mesmas condições habitacionais se repetiram, embora a exposição ao vetor se tornasse menos provável, ainda que não descartada, se considerarmos o comportamento até hoje pouco estudado de triatomíneos vetores de Trypanosoma cruzi que habitam o peridomicílio e invadem casas pelo vôo 19 . Ou ainda, pelo transporte de insetos em lenha, madeira, etc, já relatado anteriormente na Amazônia 8 .…”

Section: Discussionunclassified

Fase aguda da doença de Chagas na Amazônia brasileira: estudo de 233 casos do Pará, Amapá e Maranhão observados entre 1988 e 2005

Pinto

Valente

et al. 2008

Rev. Soc. Bras. Med. Trop.

162

102

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Foram estudados 233 casos de fase aguda da doença de Chagas, oriundos do Pará, Amapá e Maranhão, observados no período de 1988 a 2005, cento e sessenta deles retrospectivamente de 1988 a 2002 e setenta e três prospectivamente de 2003 a 2005. Entre os casos estudados 78,5% (183/233) faziam parte de surtos provavelmente por transmissão oral, acometendo em média 4 pessoas e 21,5% (50/233) eram casos isolados. Foram considerados casos agudos aqueles que apresentaram exames parasitológicos diretos (a fresco, gota espessa ou Quantitative Buffy Coat - QBC) e/ou IgM anti-Trypanosoma cruzi positivos. Foram feitos ainda xenodiagnósticos em 224 pacientes e hemoculturas em 213. Todos foram avaliados clinica e epidemiologicamente. As manifestações clínicas mais freqüentes foram febre (100%), cefaléia (92,3%), mialgia (84,1%), palidez (67%), dispnéia (58,4%), edema de membros inferiores (57,9%), edema de face (57,5%) dor abdominal (44,2%), miocardite (39,9%) e exantema (27%). O eletrocardiograma mostrou alterações de repolarização ventricular em 38,5% dos casos, baixa voltagem de QRS em 15,4% e desvio de SAQRS em 11,5%, extra-sístoles ventriculares em 5,8%, bradicardia em 5,8% e taquicardia em 5,8%, bloqueio de ramo direito em 4,8% e fibrilação atrial em 4,8%. A alteração mais freqüente vista no ecocardiograma foi o derrame pericárdico em 46,2% dos casos. Treze (5,6%) pacientes evoluíram para o óbito, 10 (76,9%) dos quais por comprometimento cardiovascular, dois por complicações de origem digestiva e um de causa mal definida.

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Section: Discussionunclassified

Fase aguda da doença de Chagas na Amazônia brasileira: estudo de 233 casos do Pará, Amapá e Maranhão observados entre 1988 e 2005

Pinto

Valente

et al. 2008

Rev. Soc. Bras. Med. Trop.

162

102

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“…Triatominae used: The domiciliated T. infestans, T. dimidiata and R. prolixus, T .sordida, T. pseudomaculata, T.brasiliensis, P.megistus, all essentially sylvatic but some like T. sordida and P.megistus in process of adaptation to human dwellings, in areas maintained under control following insecticidal elimination of T.infestans, as stated by Barreto 4 and Forattini et al 5 ; T.rubrovaria and R.neglectus considered completely wild bugs although, the latter tends to colonize human homes in areas of intensive agricultural and cattle breeding activities as reported by Forattini et al 6 and by Silveira et al 17 .…”

Section: Protozoamentioning

confidence: 90%

Studies in search of a suitable experimental insect model for xenodiagnosis of hosts with Chagas' disease: 3 - On the interaction of vector species and parasite strain in the reaction of bugs to infection by Trypanosoma cruzi

Perlowagora-Szumlewicz¹,

Müller²,

Moreira³

1988

Rev. Saúde Pública

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ABSTRACT:The reaction of nine vector species of Chagas' disease to infection by seven different Trypanosoma cruzi strains; Berenice, Y, FL, CL, S. Felipe, Colombiana and Gávea, are examined and compared. On the basis of the insects' ability to establish and maintain the infection, vector species could be divided into two distinct groups which differ in their reaction to an acute infection by T. cruzi. While the proportion of positive bugs was found to be low in Triatoma infestans and Triatoma dimidiata it was high, ranging from 96.9% to 100% in the group of wild (Rhodnius neglectus, Triatoma rubrovaria)and essentially sylvatic vectors in process of adaptation to human dwellings, maintained under control following successful insecticidal elimination of Triatoma infestans (Panstrongylus megistus, Triatoma sordida and Triatoma pseudomaculata). An intermediate position is held by Triatoma brasiliensis and Rhodnius prolixus. This latter has been found to interchange between domestic and sylvatic environments. The most important finding is the strikingly good reaction between each species of the sylvatic bugs and practically all T. cruzi strains herein studied, thus indicating that the factors responsible for the excellent reaction of P.megistus to infection by Y strain, as previously reported also come into operation in the reaction of the same vector species to acute infections by five of the remaining T.cruzi strains. Comparison or data reported by other investigators with those herein described form the basis of the discussion of Dipetalogaster maximus as regards its superiority as a xenodiagnostic agent.

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“…Thus, the persistent T. sordida infestation in Triângulo Mineiro may be because of the following: 1) environmental degradation that facilitate the dispersion of T. sordida, allowing colonization in artifi cial ecotopes (5) (19) (20) ; 2) operational failures (9) ; and 3) complexity of the peridomicile in the Triângulo Mineiro region (18) . Regarding environmental degradation, studies have shown that profound modifi cations to the natural environment of the Triângulo Mineiro region to promote agriculture and increase livestock caused displacement or disappearance of the refuges and natural food sources of T. sordida, which then sought these in the alternative artifi cial environment in order to survive.…”

Section: Ethical Considerationsmentioning

confidence: 99%

“…It seems the change in vegetable coverage, hair least to some extent, provide T. sordida dispersion. High infestation in houses closest to the wild environment suggests recolonization of triatomines (nymphs to adults) in the artifi cial environment from their natural ecotopes (5) (19) (20) , contributing to the persistent infestation in the region.…”

Section: Ethical Considerationsmentioning

confidence: 99%

“…A recent ecological niche modeling study revealed the possibility that the T. sordida distribution area could be larger than that initially known, i.e., this triatomine could also inhabit other biomes such as Caatinga and Pantanal (4) . Such biological characteristics, including their ability to resist fasting, ease of adapting to different hosts, and relative mobility (mainly the adults) facilitate dispersion and colonization in artifi cial ecotopes (5) . This, T. sordida can be considered a semidomicile species, given the frequency with which it has been found in peridomicile and intradomicile environments (6) .…”

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confidence: 99%

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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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Aspectos ecológicos da tripanossomíase americana: XIV - Persistência e potencial de domiciliação de populações triatomínicas silvestres em região de intensa atividade agropecuária

Cited by 23 publications

References 9 publications

Fase aguda da doença de Chagas na Amazônia brasileira: estudo de 233 casos do Pará, Amapá e Maranhão observados entre 1988 e 2005

Fase aguda da doença de Chagas na Amazônia brasileira: estudo de 233 casos do Pará, Amapá e Maranhão observados entre 1988 e 2005

Studies in search of a suitable experimental insect model for xenodiagnosis of hosts with Chagas' disease: 3 - On the interaction of vector species and parasite strain in the reaction of bugs to infection by Trypanosoma cruzi

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

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