Hábitos alimentares, infecção natural e distribuição de triatomíneos domiciliados na região central do Brasil

Forattini, Oswaldo Paulo; Barata, José Maria Soares; Santos, Jair Lício Ferreira; Silveira, Antônio Carlos

doi:10.1590/s0034-89101982000400001

Cited by 40 publications

(37 citation statements)

References 9 publications

(1 reference statement)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Various reports of T. sordida and T. guasayana in human environments in Southern Cone countries (Forattini et al 1982, Carcavallo et al 1988, Noireau et al 1997 make them vector candidates and this should encourage more studies on these species. With regard to the vectorial control of Chagas disease, the peridomicile vectors have a special importance due to their role in these processes and the re-infestation of housing during entomological surveillance.…”

Section: Discussionmentioning

confidence: 99%

Vectorial capacity of Triatoma guasayana (Wygodzinsky & Abalos) (Hemiptera: Reduviidae) compared with two other species of epidemic importance

Loza-Murguia¹,

Noireau²

2010

Neotrop. entomol.

View full text Add to dashboard Cite

-Triatoma guasayana (Wygodzinsky & Abalos) is a peridomestic triatomine with epidemiological importance in Bolivia, that may play an important role in the transmission of Trypanosoma cruzi (Chagas). In this study, two parameters of vectorial capacity were evaluated: the interval of feeding-defecation time and metacyclogenesis, in adult males and females and nymphal instars II to V of T. guasayana with comparisons with Triatoma infestans (Klug) and T. sordida (Stal). The results showed a close relationship between ingestion of blood and beginning of defecation. Values were negative in T. infestans, and T. sordida for instars II, III, IV, and V and also males and females but were positive in female T. sordida. Triatoma guasayana showed only negative values for instar II. Adults and nymphs began defecation as soon as they had finished feeding and required an average of 29.8 min. The analysis of metacyclogenesis showed that T. guasayana was superior to T. infestans and T. sordida. However, the vectorial effectiveness of T. guasayana was significantly affected regarding the percentage of metacyclic trypomastigotes during instars III to V and showed a progressive increase. Females had higher proportions despite their ingestion being half that of T. infestans. The different instars of T. guasayana had a higher parasitic load than those of T. sordida and, although ingestion was 1/3 of that of female T. infestans, there was a progressive increase in metacyclic trypomastigotes in the different nymphal stages of T. guasayana that decreased in adults.

show abstract

Section: Discussionmentioning

confidence: 99%

Vectorial capacity of Triatoma guasayana (Wygodzinsky & Abalos) (Hemiptera: Reduviidae) compared with two other species of epidemic importance

Loza-Murguia¹,

Noireau²

2010

Neotrop. entomol.

View full text Add to dashboard Cite

show abstract

“…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 . However, P. megistus has varied feeding habits, also feeding on birds, dogs, cats, rodents, cattle, goats, pigs, and humans 17,27,30 . Compared with other species such as T. sordida, P. megistus presents higher preferences for human blood, increasing the risk of transmission of T. cruzi by this vector 30 .…”

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

“…Triatoma dimidiata and Rhodnius prolixus, traced to exchange between natural and artificial biotopes by Gamboa 14 (1963) and Gomez-Nunez 16 (1969 26 , Barreto 4 and Forattini et al 9,11,12 .…”

Section: Methodsmentioning

confidence: 99%

“…Instead, greater emphasis is here given to the use of completely wild or essentially sylvatic bugs in the process of invading human homes. These insects found in human dwellings over the last 2-3 decades have not so far settled there for good (Forattini et al,11,12 ) and will probably continue to have the characteristics of sylvatic insects for many years to come, depending mostly on the intensity of the industrialization occurring in the endemic regions under control. This is also the reason for the use of the term "essentially sylvatic" when analyzing the responsiveness of these vector species to infections by T. cruzi stocks.…”

Section: Introductionmentioning

confidence: 99%

Studies in search of a suitable experimental insect model for xenodiagnosis of hosts with Chagas' disease: 4 - The reflection of parasite stock in the responsiveness of different vector species to chronic infection with different Trypanosoma cruzi stocks

Perlowagora-Szumlewicz¹,

Müller²,

Moreira³

1990

Rev. Saúde Pública

View full text Add to dashboard Cite

Previous studies (1982,1987) have emphasized the superiority of sylvatic vector species over domestic species as xenodiagnostic agents in testing hosts with acute or chronic infections by T. cruzi "Y" stock. The present study, which is unique in that it contains data on both infectivity rates produced by the same stock in 11 different vector species and also the reaction of the same vector species to seven different parasite stocks, establishes the general validity of linking efficiency of xenodiagnosis to the biotope of its agent. For example, infectivity rates produced by "São Felipe" stock varied from 82.5% to 98.3% in sylvatic vectors but decreased to 42.5% to 71.3% in domestic species. "Colombiana" stock produced in the same sylvatic vectors infectivity rates ranging from 12.5% to 45%. These shrank to 5%-22.5% in domestic bugs. The functional role of the biotope in the vector-parasite interaction has not been eluddated. But since this phenomenon has been observed to be stable and easy to reproduce, it leads us to believe that the results obtained are valid. Data presented also provide increasing evidence that the infectivity rates exhibited by bugs from xenodiagnosis in chronic hosts, are parasite stock specific. For example, infectivity rates produced by "Berenice", "Y", "FL" and "CL" varied in R. neglectus from 26.3% to 75%; in P. megistus from 56.3% to 83.8%; in T. sordida from 28.8% to 58.8% in T. pseudomaculata from 41.3% to 66.3% and in T. rubrovaria from 48.8% to 85%. Data from xenodiagnosis in the same hosts, carrying acute infections by the same parasite stocks, gave the five sylvatic vectors a positive rating of approximately 100%, thus suggesting that the heavy loads of parasites circulating in the acute hosts obscured the characteristic interspecific differences for the parasite stock. Nonetheless these latter were revealed in the same hosts with chronic infections stimulated by very low numbers of the same parasite stocks. Certain observations here described lead us to speculate as to the possibility of further results from other parasite stocks, allowing the association of the infectivity rates produced in bugs by different parasite stocks with the isoenzymic patterns revealed by these stocks.

show abstract

Hábitos alimentares, infecção natural e distribuição de triatomíneos domiciliados na região central do Brasil

Cited by 40 publications

References 9 publications

Vectorial capacity of Triatoma guasayana (Wygodzinsky & Abalos) (Hemiptera: Reduviidae) compared with two other species of epidemic importance

Vectorial capacity of Triatoma guasayana (Wygodzinsky & Abalos) (Hemiptera: Reduviidae) compared with two other species of epidemic importance

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

Studies in search of a suitable experimental insect model for xenodiagnosis of hosts with Chagas' disease: 4 - The reflection of parasite stock in the responsiveness of different vector species to chronic infection with different Trypanosoma cruzi stocks

Contact Info

Product

Resources

About