Encontro de Panstrongylus megistus em ecótopo artificial: domiciliação ou mera visitação?

Nascimento, Carlos; Marassá, Ana Maria; Curado, Izilda; Piazza, Roxane M. F.

doi:10.1590/s0037-86821997000400010

Cited by 12 publications

(7 citation statements)

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“…In the south of Brazil it occurs mainly in wild ecotopes 16,22 , unlike in the southeast and northeast regions where P. megistus has greater epidemiological importance for occupying artificial ecotopes 15,17,[23][24][25] . Specimens of P. megistus prefer tree hollows in arboreal habitats 26,27 , and they feed on marsupials (Didelphis spp.…”

Section: Discussionmentioning

confidence: 99%

Occurrence of synanthropic triatomines (Hemiptera: Reduviidae) in the Federal District of Brazil

Maeda

Knox

Gurgel-Gonçalves

2012

Rev. Soc. Bras. Med. Trop.

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This retrospective analysis considered the number of adults and nymphs of each species collected and infected in both intradomicile and peridomicile. Results: A total of 754 triatomines were collected in 252 reported domiciles. Panstrongylus megistus was the most frequent species (65%), followed by T. pseudomaculata (14%). Of the 309 examined insects, only 3 (1%) specimens of P. megistus were infected with flagellates morphologically similar to Trypanosoma cruzi. The spatial occurrence indicated a higher diversity of triatomines and frequency of T. sordida in rural areas. Moreover, there was a predominance of P. megistus in urban areas. The number of records of P. megistus in the rainy season was two times higher than that during the dry season. The largest number of triatomines was collected in November. Conclusions: The presence of P. megistus specimens infected with trypanosomes in domiciles, shows the potential risk of human infection in DF. Thus, it is essential to continue entomological surveillance, intensifying it in the rainy season and in regions of greater occurrence. Keywords: Chagas disease control. Entomological surveillance. Synanthropic triatomines. Federal District. Brazil. triatomines. Furthermore, the invasion and/or colonization of infected triatomines from wild ecotopes may represent the risk of vectorial transmission with the installation of peridomiciliary and domiciliary cycles of T. cruzi 6,7 . In this context, the objective of this paper is to analyze the spatial and temporal occurrence of triatomine species collected in DF, as well as their indices of natural infection with trypanosomes to direct actions of entomological surveillance of Chagas disease coordinated by SES-DF. RESUMO 72 METHODS RESULTS Maeda MH et al -Occurrence of triatomines in DF Study areaThe Federal District of Brazil is geographically located between the parallels 15º30' and 16º03' south latitude, and between meridians 47°25' and 48°12' west longitude, in Central Brazil, one of the highest areas of the region, the Central Plateau. According to 2010 Census results, the population comprises 2,563,963 people in an area of 5,787,784km 2 divided into 30 administrative regions 8 . The area is filled with plateaus over 1,000m in altitude. The average annual rainfall is around 1,600mm, and the average annual temperature ranges between 18°C and 20°C with two distinct seasons, the dry season from May to September and the rainy season from October to April, the latter season with the highest temperature records 9 . Triatomine collection and natural infectionThe insects were collected in intradomiciliary and peridomiciliary environments by residents and then taken to the PITs. Each PIT receives a kit with materials for insect storage, a notepad to keep notes containing the address and location of collection, and tweezers for the handling of specimens.After notification, the SES-DF public health agents did active searches in these houses and their annexes. The materials used for triatomine collection were metal tweezers and fl...

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Section: Discussionmentioning

confidence: 99%

Occurrence of synanthropic triatomines (Hemiptera: Reduviidae) in the Federal District of Brazil

Maeda

Knox

Gurgel-Gonçalves

2012

Rev. Soc. Bras. Med. Trop.

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“…Sabe-se que apenas a utilização do inseticida sem a participação dos moradores não seria suficiente para manter as UDS livres da infestação, lembrando que o peridomicílio foi o local mais infestado e que a participação da comunidade foi efetiva dando maior atenção à limpeza deste. O inseticida usado em anexos mais expostos às adversidades do meio ambiente com maior grau de exposição solar, ventos e chuvas, pode ter seu tempo de ação reduzido (Nascimento et al, 1997). Dias & Garcia (1978), em Bambuí, Minas Gerais, demonstraram que a população responde de forma efetiva às ações de seus interesses na medida em que compreende os processos e os problemas que lhe afetam de modo direto.…”

Section: Discussionunclassified

Atividades educativas para o controle de triatomíneos em área de vigilância epidemiológica do Estado do Paraná, Brasil

et al. 2002

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This paper describes a health education project targeting a rural community and health professionals from counties undergoing epidemiological surveillance for Chagas disease vectors in the State of Paraná, Brazil. A group of technicians from the Brazilian National Health Foundation (FUNASA) was trained, together with teachers, workers, and students from the State University of Maringá, who prepared an instructions manual and drew up guidelines for reporting presence of triatomines or suspected cases of Trypanosoma cruziinfection. From June 1996 through February 2000, the activities reached 742 families, 2,300 schoolchildren, and 27 teachers from 18 elementary schools, and included a meeting between FUNASA members and 40 participants, 21 meetings in health centers, and provision of a set of preserved triatomine specimens for use in vector surveillance and identification. After three years of health education activities and insecticide treatment (cipermetrina 125 mg i.a./m2), there was a reduction of 80.6% in households infested with triatomines and increased awareness among rural residents and health workers. The authors discuss the need to train professionals committed to changing Brazil's prevailing health model.

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“…, 2007). According to Nascimento et al. (1997), the degradation of natural habitat and subsequent occupation of deforested areas by humans and their domestic animals are factors facilitating such adaptation.…”

Section: Introductionmentioning

confidence: 99%

“…At least five of the described 143 triatomine species have acquired the ability to colonize and sustain populations in human dwellings, resulting in domiciliary transmission of T. cruzi (Dias, 1994;WHO, 2002;Galvão et al, 2003;Costa et al, 2006;Galvão & Angulo, 2006;Bérenger & Blanchet, 2007;Costa & Felix, 2007;Martinez et al, 2007;Sandoval et al, 2007). According to Nascimento et al (1997), the degradation of natural habitat and subsequent occupation of deforested areas by humans and their domestic animals are factors facilitating such adaptation.…”

Section: Introductionmentioning

confidence: 99%

Influence of the landscape on dispersal of sylvatic triatomines to anthropic habitats in the Atlantic Forest

Leite¹,

Santos

Falqueto

2010

Journal of Biogeography

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Aim The aim of this study was to test the hypothesis that the dispersal of sylvatic triatomines to anthropic habitats is stimulated by degradation of their natural habitat.Location State of Espírito Santo, south-eastern Brazil.Methods We georeferenced records of domiciliary captures of sylvatic triatomines (1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005) obtained from the database of the entomological surveillance programme of the Brazilian National Health Foundation. We partitioned the study area into 543 equal hexagons and attributed information on the presence/absence of triatomines and climatic, topographic and biological variables to each. Using generalized additive models (GAMs), we defined the determinant variables for triatomine presence/absence and demarcated the potential areas in which they might occur. We then subjected the hexagons with a high probability of triatomine presence to a second analysis, adding information on the number of domiciliary captures of triatomines and landscape indices that measured quantitative and spatial patterns of forest fragments. We used GAMs to determine the indices that influenced the number of domiciliary captures of triatomines. ResultsThe presence of triatomines was characterized by a strong positive correlation with variability of terrain slope. This variable was used to demarcate the areas where triatomines were likely to occur. Landscape indices associated with the number of domiciliary captures of triatomines were the number of patches, the fractal dimension index, the total core area and the clumpiness index. Main conclusionsOur results do not support the hypothesis that domiciliary invasion by sylvatic triatomines is stimulated by environmental degradation. Instead, the results suggest that less degraded areas maintain larger populations of triatomines and consequently present higher indices of dispersal and domiciliary invasion. Particular landscape patterns and dispositions of human dwellings, however, may enhance the probability of triatomines being attracted to the artificial light of dwellings. Initiation of flight and consequent dispersal is a naturally occurring process that allows triatomines to find and colonize areas that favour the survival of their offspring.

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Encontro de Panstrongylus megistus em ecótopo artificial: domiciliação ou mera visitação?

Cited by 12 publications

References 1 publication

Occurrence of synanthropic triatomines (Hemiptera: Reduviidae) in the Federal District of Brazil

Occurrence of synanthropic triatomines (Hemiptera: Reduviidae) in the Federal District of Brazil

Atividades educativas para o controle de triatomíneos em área de vigilância epidemiológica do Estado do Paraná, Brasil

Influence of the landscape on dispersal of sylvatic triatomines to anthropic habitats in the Atlantic Forest

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