Triatomíneos da Amazônia ) Encontro de três espécies naturalmente infectadas por Trypanosoma semelhante ao cruzi, no Estado do Amazonas (Hemiptera, reduviidae).

Almeida, Flávio Barbosa de

doi:10.1590/1809-43921971011089

Cited by 20 publications

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“…Of the species of triatomine found in Amazon Brazil, ten are infected with T. cruzi (Almeida 1971, Lent & Wygodzinsky 1979, Miles et al 1981, 1983, Brazil et al 1985, Barrett & Guerreiro 1991, among them R. brethesi (Coura et al 1999).…”

Section: Discussionmentioning

confidence: 99%

Morphobiological aspects of Rhodnius brethesi Matta, 1919 (Hemiptera:Reduviidae) from the Upper and Middle Negro River, Amazon region of Brazil: I - scanning electron microscopy

Santos-Mallet¹,

Junqueira

Moreira

et al. 2005

Mem. Inst. Oswaldo Cruz

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The occurrence of autochthonous cases of Chagas disease in the Amazon region of Brazil over recent decades has motivated an intensification of studies in this area. Different species of triatomines have been identified, and ten of these have be proven to be carriers of the parasite Trypanosoma cruzi or "cruzi-like" parasites. Studies conducted in the municipalities of Santa Isabel do Rio Negro and Barcelos, located on the Upper and Middle of the Negro River, microregion of Negro River, state of Amazonas have confirmed not only thatRhodnius brethesi is present in the palm tree Leopoldinia piassaba, but also that this insect was recognized by palm fiber collectors. A morphological study of eyes, inter-ocular and inter-ocellar regions, antennae, buccula, labrum, rostrum, stridulatory sulcus and feet, including the apex of the tibia, spongy fossette and ctenidium was conducted by scanning electron microscopy. The buccula and the stridulatory sulcus presented notable differences in specimens of different genera and also of different species. These data make it possible to suggest that the details presented in these structures can be included as diagnostic characteristics to be used in new dichotomous keys, thereby contributing towards studies of taxonomy and systematics and furnishing backing for comparative analysis of specimens collected from different localities.Key words: Rhodnius brethesi -external morphology -taxonomy -scanning electron microscopy -Amazon region -Brazil Over recent years, attention has been drawn to Chagas disease infection in the Amazon region of Brazil because of increased numbers of reports of acute cases and the presence of individuals who are serologically positive for this infection (Coura et al. 1995, 2002a, Fraiha Neto et al. 1995, Valente et al. 1999, Dias et al. 2002. So far, it is unclear whether these growing numbers of human cases are due to increased transmission or whether they are the result from an active search for positive cases. This latter is the case in the state of Pará, where greater numbers of small outbreaks attributed to contamination by oral transmission have been described (Valente et al. 1999).One of the epidemiological profiles discerned in the Amazon region that has received deserved attention is the one found in the Upper and Middle Negro River region, microregion of Negro River in the state of Amazonas. Initial investigations by Coura et al. (1994Coura et al. ( , 1995 indicated that the presence of human infection in areas of the Negro River were associated with extractive activities relating to the collection of fiber from the native palm tree Leopoldinia piassaba Wallace, 1853. The link in the transmission cycle was pinpointed as the contact between the fiber gatherer and the species of triatomines present in the extraction areas (Coura et al. 2002a). The data obtained though that investigation showed that two vector species were present in the extraction areas: Rhodnius brethesi Matta, 1919, and Panstrongylus geniculatus (Latreille, 1811). The first of th...

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Section: Discussionmentioning

confidence: 99%

Morphobiological aspects of Rhodnius brethesi Matta, 1919 (Hemiptera:Reduviidae) from the Upper and Middle Negro River, Amazon region of Brazil: I - scanning electron microscopy

Santos-Mallet¹,

Junqueira

Moreira

et al. 2005

Mem. Inst. Oswaldo Cruz

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“…Several authors (7,8,(17)(18)(19)12) described T. cruzilike flagellate protozoans (instead of T. cruzi) in the blood of various classes of mammals and in the feces of triatomine species from the Amazon Basin. We detected blood flagellates in 9 of 10 Didelphidae captured in backyards of houses in Paço do Lumiar county.…”

Section: Discussionmentioning

confidence: 99%

“…Nineteen sylvatic species of triatomines were identified in the Amazon Basin (7)(8)(9)(10), six in association with palm tree microhabitats ( Table 1). Eleven of these species were infected with Trypanosoma cruzi or T. cruzi-like flagellates (17,18). None of these triatomine species, with the possible exception of T. rubrofasciata, have adapted to human habitats in the Amazon Basin (19).…”

Section: Researchmentioning

confidence: 99%

“…The strategy for trapping sylvatic triatomine bugs derived from published work (12,17), as well as observations by local residents that triatomines attracted by light fly from palm trees to houses at night. A night visit to one house resulted in capturing two triatomines on the wall near a light bulb; both these specimens had protozoan flagellates in the intestinal contents.…”

Section: Trapping Triatominesmentioning

confidence: 99%

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Emerging Chagas Disease: Trophic Network and Cycle of Transmission ofTrypanosoma cruzifrom Palm Trees in the Amazon

Teixeira

Monteiro

Rebêlo

et al. 2001

Emerg. Infect. Dis.

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“…In 1971, the occurrence of T. cruzi from naturally infected triatomines, which were implicated in the transmission of the disease, was reported in the City of Manaus 15 . Since then, there have been suspected or confirmed acute and chronic CD cases in this state, occasionally [5][6][16][17][18] .…”

Section: Article/artigomentioning

confidence: 99%

Serological survey for Chagas disease in the rural areas of Manaus, Coari, and Tefé in the Western Brazilian Amazon

Magalhães

Coelho

Maciel

et al. 2011

Rev. Soc. Bras. Med. Trop.

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Introduction: Deforestation, uncontrolled forest, human population migration from endemic areas, and the large number of reservoirs and wild vectors naturally infected by Trypanosoma cruzi promote the endemicity of Chagas disease in the Amazon region. Methods: We conducted an initial serological survey (ELISA) in a sample of 1,263 persons; 1,095 (86.7%) were natives of the State of Amazonas, 666 (52.7%) were male, and 948 (75.1%) were over 20 years old. Serum samples that were found to be reactive, indeterminate, or inconclusive by indirect immunofluorescence (IFI) or positive with low titer by IFA were tested by Western blot (WB). Serologically confirmed patients (WB) were evaluated in terms of epidemiological, clinical, ECG, and echocardiography characteristics. Results: Fifteen patients had serologically confirmed T. cruzi infection, and 12 of them were autochthonous to the state of Amazonas, for an overall seroprevalence of 1.2% and 0.9% for the state of Amazonas. Five of the 15 cases were males, and the average age was 47 years old; most were farmers with low education. One patient who was not autochthonous, having originated from Alagoas, showed right bundle branch block, bundle branch block, and anterosuperior left ventricular systolic dysfunction with an ejection fraction of 54%. Conclusions: The results of this study ratify the importance of monitoring CD cases in Amazonia, particularly in the state of Amazonas. Keywords: Chagas Disease. Serological Survey. Brazilian Amazon. RESUMOIntrodução: Na Amazônia, o desmatamento desordenado da floresta, as migrações populacionais humanas de áreas endêmicas e o grande número de reservatórios e vetores silvestres naturalmente infectados por Trypanosoma cruzi, favorece a endemicidade da doença de Chagas nessa região. Métodos: Foi realizado um inquérito sorológico inicial por ensaio imunoenzimático (ELISA), em uma amostra de 1.263 pessoas, 1.095 (86,7% ) as quais eram autóctones do Estado do Amazonas, 666 (52,7%) do sexo masculino, 948 (75,1%) com idade superior a 20 anos. As amostras de soro reativas, indeterminadas ou inconclusivas por imunofluorescência indireta (IFI) positivas ou com baixo título na IFI foram submetidas ao Western blot (WB). Os pacientes com sorologia confirmada (WB) foram avaliados do ponto de vista epidemiológico, clínico, eletro e ecocardiográfico. Resultados: Quinze pacientes tiveram sorologia confirmada para infecção por T. cruzi, 12 dos quais autóctones do Estado do Amazonas, com uma prevalência sorológica geral de 1,2% e de 0,9% para o Estado do Amazonas. Entre os 15 casos com sorologia positiva, cinco eram do sexo masculino, média de idade de 47 anos, baixa escolaridade e a maioria agricultores. Um paciente não autoctone, procedente de Alagoas, apresentou bloqueio de ramo direito, bloqueio divisional ântero-superior e disfunção sistólica ventricular esquerda com fração de ejeção de 54%. Conclusões:O resultado deste estudo reforça a importância do monitoramento de casos da doença de Chagas na Amazônia, em especial no Amazonas. Pa...

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Triatomíneos da Amazônia ) Encontro de três espécies naturalmente infectadas por Trypanosoma semelhante ao cruzi, no Estado do Amazonas (Hemiptera, reduviidae).

Abstract: Triatomíneos da Amazônia n Encontro de três espécies naturalmente infectadas por Trypanosoma semelhante ao cruzi, no Estado do Amazonas (Hemiptera, reduviidae).

Cited by 20 publications

References 0 publications

Morphobiological aspects of Rhodnius brethesi Matta, 1919 (Hemiptera:Reduviidae) from the Upper and Middle Negro River, Amazon region of Brazil: I - scanning electron microscopy

Morphobiological aspects of Rhodnius brethesi Matta, 1919 (Hemiptera:Reduviidae) from the Upper and Middle Negro River, Amazon region of Brazil: I - scanning electron microscopy

Emerging Chagas Disease: Trophic Network and Cycle of Transmission ofTrypanosoma cruzifrom Palm Trees in the Amazon

Serological survey for Chagas disease in the rural areas of Manaus, Coari, and Tefé in the Western Brazilian Amazon

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