Aspectos ecológicos da Tripanossomíase americana: VIII - Domiciliação de Panstrongylus megistus e sua presença extradomiciliar

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

doi:10.1590/s0034-89101977000100007

Cited by 42 publications

(21 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Specimens of P. megistus prefer tree hollows in arboreal habitats 26,27 , and they feed on marsupials (Didelphis spp. ), which are frequently infected with T. cruzi, thus justifying high infection indices when compared with other species of triatomines 26,28,29 . A study on T. cruzi reservoirs in DF showed that specimens of D. albiventris are responsible for maintaining enzootic circulation of the parasite in the region, where 33% of these mammals were infected 5 .…”

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.

View full text Add to dashboard Cite

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...

show abstract

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.

View full text Add to dashboard Cite

show abstract

“…Three replicates were carried out for each insect density (20,40,60,80, or 100 insects) and for each species. We applied two-way analysis of variance (ANOVA) (species versus density) to compare the mean proportion of insects outside the shelter.…”

Section: Methodsmentioning

confidence: 99%

“…19 After the introduction of T. infestans into Brazil, domiciliary colonization by P. megistus was reduced, suggesting that T. infestans expelled P. megistus from domiciliary ecotopes. 20 The elimination of T. infestans 20 by insecticide spraying in southeastern states [21][22][23] apparently facilitated the process of domiciliary colonization by sylvatic P. megistus. A drastic decrease in T. infestans detection inside households led to a concomitant increase in the number of P. megistus captured at these ecotopes.…”

Section: Introductionmentioning

confidence: 99%

“…27 Dias 18 reported that during 1943-1953, 877 domiciles with mixed infestations of P. megistus and T. infestans were identified in Brazil. Thus, the spatial isolation observed for these species 5,7,[20][21][22][23]49 is probably caused by competition processes. 5,24,26,50 Differences in dispersal rates may represent an additional dimension that could interfere in the house infestation capacity of these species.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Lack of Segregation between Two Species of Chagas Disease Vectors

Mota¹,

Lorenzo²

2012

The American Journal of Tropical Medicine and Hygiene

View full text Add to dashboard Cite

Abstract. Triatoma infestans and Panstrongylus megistus are relevant Chagas disease vectors. An apparent segregation among these triatomine species inside human households was suggested to rely on mutual repellence between them. However, P. megistus and T. infestans show aggregation responses to chemical signals emitted by the other species. These findings do not rule out the possibility that stimuli other than chemical signals could mediate repellence when these species exploit shelters simultaneously. In the present study, we investigated how P. megistus and T. infestans exploit shelters in controlled laboratory conditions and how insect density and environmental illumination modulate this behavior. We evaluated whether these species aggregate inside shelters or mutually repel each other. Panstrongylus megistus and T. infestans show specific patterns of shelter exploitation, which are differentially affected by insect density and environment illumination. In particular, P. megistus is more sensitive to insect density than T. infestans, whereas T. infestans shows higher sensitivity to illumination than P. megistus. Nevertheless, these species exploit shelters randomly without any apparent repellence.

show abstract

“…We conclude that an active surveillance program is necessary to contain household infestations. (Leal et al 1961, Schlempler-Jr et al 1985, Grisard et al 2000; 3: state of São Paulo (hollow trees, anfractuosities, bromeliads, palms and rock shelters) (Barretto et al 1964, Barretto 1967, Forattini et al 1970, 1977; 4: state of Rio de Janeiro (hollow trees) (Miles et al 1982); 5: state of Minas Gerais (hollow trees, tree holes, palms and burrows in the floor) (Barretto et al 1978, Neves 1979, Santos-Júnior et al 2011, the present paper).…”

mentioning

confidence: 99%

First report of Panstrongylus megistus sylvatic focus in municipality of Bambuí, state of Minas Gerais, Brazil

Júnior

Diotaiuti

Dias

2011

Mem. Inst. Oswaldo Cruz

View full text Add to dashboard Cite

In 1943, the Center for the Study and Prophylaxis of Chagas Disease, Oswaldo Cruz Foundation, state of Minas Gerais (MG), was created in the municipality of Bambuí to carry out studies related to Chagas disease in the mid-western region of MG. Since that time, several investigations have been conducted to determine the natural habitat of triatomines, but Panstrongylus megistus colonies have never been found in this region. This paper records the first finding of a P. megistus sylvatic colony in 69 years of research. The characteristics of this ecotope and its implications for the epidemiology of Chagas disease are discussed

show abstract

Aspectos ecológicos da Tripanossomíase americana: VIII - Domiciliação de Panstrongylus megistus e sua presença extradomiciliar

Cited by 42 publications

References 5 publications

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

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

Lack of Segregation between Two Species of Chagas Disease Vectors

First report of Panstrongylus megistus sylvatic focus in municipality of Bambuí, state of Minas Gerais, Brazil

Contact Info

Product

Resources

About