Colonização de ecótopos artificiais pelo Panstrongylus megistus na ilha de Santa Catarina, Florianópolis, Santa Catarina, Brasil

Steindel, Mário; Toma, Helena Keiko; Pinto, C.; Grisard, Edmundo Carlos; Schlemper, Bruno Rodolfo

doi:10.1590/s0036-46651994000100008

Cited by 22 publications

(8 citation statements)

References 10 publications

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“…In spite of the low indices for natural infection with trypanosomes for this species in DF, compared with studies in different regions of Brazil [12][13][14][15][16][17] , it is important to stress that some of the triatomines were found colonizing intradomicile and feeding on human blood according to precipitin tests (unpublished data), thus evidencing the risk of human infection. Our results also show that the spatial occurrence of triatomine species is different in the 20 administrative regions studied in DF, with the highest number of records and species richness observed in Planaltina, a predominantly rural region with the highest frequency of T. sordida.…”

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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“…For example, in some situations, 13,[34][35][36] rodents and opossums show long-lasting parasitemia 37,38 and seem to play a role analogous to that of dogs in northwest Argentina. Their removal is expected to bring a decrease in bug infection rates.…”

Section: Discussionmentioning

confidence: 99%

Influence of humans and domestic animals on the household prevalence of Trypanosoma cruzi in Triatoma infestans populations in northwest Argentina.

Gürtler¹,

Cohen²,

Cecere³

et al. 1998

The American Journal of Tropical Medicine and Hygiene

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Abstract. In three rural villages of northwest Argentina, the overall proportion of domiciliary Triatoma infestans infected with Trypanosoma cruzi was 49% among 1,316 bugs individually examined for infection in March and October 1992). Most of the variation among individual households in the proportion of infected triatomines was explained by variations among houses in the proportion of bugs that fed on dogs or cats, the prevalence of infected dogs or cats, and the proportion of bugs that fed on humans, according to a logistic multiple regression analysis. The effects of human infection rates on bug infection rates were not statistically significant. After adjusting for the effects of other predictors, the presence of chickens in bedroom areas had negative and significant effects on the proportion of infected Triatoma infestans, and positive and significant effects on the number of T. cruzi-infected triatomines collected per person-hr per house. Dog or cat infection rates and the proportion of bugs that fed on dogs or cats and on chickens explained 80% of the total variance of infected-bug numbers in a linear multiple regression model. This is the first study to use detailed field data to show that variations in triatomine infection rates depend on bug host feeding patterns and dog or cat infection rates, while the presence of chickens in bedroom areas exerts opposite effects on the proportion and number of infected triatomines. Domestic animals play a crucial role in the domiciliary transmission of T. cruzi.Triatoma infestans Klug, probably the most important and widespread domiciliary vector of Trypanosoma cruzi, 1 showed one of the highest rates of infection with T. cruzi (median ϭ 34%, range ϭ 12-68%) in extensive surveys carried out when insecticidal campaigns were nil or at an early stage in several countries. 2 For young men drafted into military service from all over Argentina, the Province of Santiago del Estero (northwest Argentina) had the highest prevalence rate of seropositivity for T. cruzi among all provincewide prevalence rates in the period 1964-1969 when the first screening took place, and the third highest prevalence rate in 1981. 3 In this province, the percentage of T. cruzi-infected Triatoma infestans collected from human sleeping quarters (hereafter domiciliary areas) was high (44%) and widely variable (range ϭ 21-82%) from district to district. 4 More recently, domiciliary vector infection rates were 31% more than 10 years after the first spraying of houses with insecticides in northwest Santiago del Estero. 5 Explaining such variable infection rates of domiciliary triatomines within a given community or province may increase our understanding of the transmission dynamics of T. cruzi.Vector feeding patterns link hosts, vectors, and the transmission of parasites in either direction between hosts and vectors. Dogs, chickens, and humans are the most important host blood sources of domiciliary Triatoma infestans throughout its range. 6 In northwest Argentina, the feeding pattern of domiciliar...

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“…Aragão 46 showed that humidity followed by lower temperatures produces a greater wet surface permanence in residences, making such habitats unsuitable for these triatomines. However, the presence of P. megistus in artifi cial habitats in the States of Santa Catarina and Paraná demonstrates the species' ability to colonize this environment in the southern region of the country, even at a low intensity 50,51 . In the State of Rio Grande do Sul, the fi rst domiciliary species focus was described by Di Primio 30 in the municipality of Viamão.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of natural foci of Panstrongylus megistus in a forest fragment in Porto Alegre, State of Rio Grande do Sul, Brazil

Junior

Viola

Lorosa

et al. 2013

Rev. Soc. Bras. Med. Trop.

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Introduction:Panstrongylus megistus is commonly found in wild environments of the State of Rio Grande do Sul, Brazil. The aim of this study was to characterize the network of refuges used by triatomine in a forest fragment of Porto Alegre and to identify Trypanosoma cruzi infection, associated hosts and the epidemiological importance of both hosts and triatomines. Methods: Techniques including the spool-and-line method and active searching (transects) were used to identify natural foci. Results: The food source for each triatomine was determined using the precipitin test, and the infection of marsupials was determined by xenodiagnosis. A total of 33 adults (domestic environment) and 27 nymphs (wild environment) of P. megistus were found in addition to 43 Didelphis albiventris specimens. The infection rates of triatomine adults, triatomine nymphs and opossums with T. cruzi I were 64%, 73% and 69%, respectively. Birds, rodents and opossums were the main resources used by triatomine. Conclusions: This work presents the fi rst characterization of a natural focus of P. megistus in Rio Grande do Sul. The natural characteristics of this focus and its implication in the transmission of T. cruzi are discussed.

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Colonização de ecótopos artificiais pelo Panstrongylus megistus na ilha de Santa Catarina, Florianópolis, Santa Catarina, Brasil

Cited by 22 publications

References 10 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

Influence of humans and domestic animals on the household prevalence of Trypanosoma cruzi in Triatoma infestans populations in northwest Argentina.

Evaluation of natural foci of Panstrongylus megistus in a forest fragment in Porto Alegre, State of Rio Grande do Sul, Brazil

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