scholarly journals Comparison of feeding and defecation patterns between fifth-instar nymphs of Triatoma patagonica (Del Ponte, 1929) and Triatoma infestans (Klug, 1934) under laboratory conditions

2008 ◽  
Vol 41 (4) ◽  
pp. 330-333 ◽  
Author(s):  
Claudia Susana Rodríguez ◽  
Silvia Alejandra Carrizo ◽  
Liliana Beatriz Crocco
Keyword(s):  
Chagas Disease ◽  
Vector Competence ◽  
Triatoma Infestans ◽  
Feeding Pattern ◽  
Human Environment ◽  
Laboratory Conditions ◽  
Ad Libitum

Among the vectors of Chagas disease, Triatoma patagonica is a species in the process of adaptation to the human environment. However, its vector competence is not well known. This study had the aim of evaluating and comparing feeding and defecation patterns among fifth-instar nymphs of Triatoma patagonica and Triatoma infestans that were fed ad libitum. The results showed that nymphs of Triatoma patagonica had a feeding pattern similar to that of Triatoma infestans. Sixty nine percent and 58% of nymphs of Triatoma patagonica and Triatoma infestans, respectively, produced their first defecation within five minutes after being fed. Triatoma patagonica defecated during feeding, with an average time until first defecation that was shorter than that of Triatoma infestans (3.4 and 6.2 min, respectively). The nymphs of Triatoma patagonica were capable of defecating during or immediately after feeding.

Effects of the infection with Trypanosoma cruzi on the feeding and excretion/defecation patterns of Triatoma infestans

2019 ◽  
Vol 110 (1) ◽  
pp. 169-176 ◽  
Author(s):  
N. Pereyra ◽  
P.A. Lobbia ◽  
G. Mougabure-Cueto
Keyword(s):  
Trypanosoma Cruzi ◽  
Feeding Behavior ◽  
Vector Competence ◽  
Triatoma Infestans ◽  
Feeding Pattern ◽  
Mammalian Host ◽  
Mucous Membranes ◽  
Ad Libitum ◽  
First Time

AbstractTransmission of Trypanosma cruzi (Kinetoplastida: Trypanosomatidae) occurs when feces/urine of infected triatomines come into contact with mucous membranes or damaged skin, and this occurs mainly when insects defecate while feeding on the host. Thus, the vector competence of the triatomines is associated with their feeding and excretion/defecation behavior. This work studied for the first time the effect of T. cruzi infection on feeding and excretion/defecation patterns of Triatoma infestans (Hemiptera: Reduviidae). Uninfected and infected fifth-instar nymphs were fed ad libitum and their feeding behavior and defecations were registered during and after feeding. The feeding pattern did not show differences between the experimental groups. However, the infected nymphs began to defecate earlier, defecated in greater quantity and there was a greater proportion of defecating individuals compared to uninfected nymphs. These results show that T. cruzi affected the excretion/defecation pattern of T. infestans in a way that would increase the probability of contact between infective feces and the mammalian host.

scholarly journals Experimental control of Triatoma infestans in poor rural villages of Bolivia through community participation

2015 ◽  
Vol 109 (2) ◽  
pp. 150-158 ◽  
Author(s):  
Frédéric Lardeux ◽  
Stéphanie Depickère ◽  
Claudia Aliaga ◽  
Tamara Chavez ◽  
Lilian Zambrana
Keyword(s):  
Community Participation ◽  
Chagas Disease ◽  
Disease Transmission ◽  
Control Strategies ◽  
Low Cost ◽  
Health Intervention ◽  
Triatoma Infestans ◽  
Human Environment ◽  
Chaco Region ◽  
House Infestation

Abstract Background Triatoma infestans is the main vector of Chagas disease in the southern cone countries. Present control strategies based on indoor and outdoor residual insecticide spraying are not sufficient to control disease transmission, particularly in Bolivia. Techniques based on the management of the human environment may be good alternatives or supplements. Methods Social and entomological surveys were carried out in four villages of Bolivia situated in the dry inter-Andean Valleys and the Chaco region. Risk factors for house infestation by T. infestans were identified, and an eco-health intervention based on education and community participation was carried out to reduce the risks of house infestation. It consisted of implementing simple and low cost vector control techniques such as coating of mud walls, cleaning activities and removal of poultry that enter rooms to lay eggs. Results The eco-health intervention significantly reduced the number of infested bedrooms, the mean abundance of T. infestans in bedrooms and beds, especially in the Chaco region. Mud wall coating was well accepted and could be proposed as a supplementary tool to the National Program of Chagas Disease Control to enhance the effects of insecticide sprayings. Conclusions Even if cleaning activities were still neglected, community participation proved to be effective in reducing house infestation.

Improving houses in the Bolivian Chaco increases effectiveness of residual insecticide spraying against infestation with Triatoma infestans, vector of Chagas disease

2021 ◽  
Author(s):  
Raquel Gonçalves ◽  
Daniel Landivar ◽  
Edson Grover Sañez Liendo ◽  
Janet Mamani Fernandez ◽  
Hanafy M. Ismail ◽  
...  
Keyword(s):  
Chagas Disease ◽  
Triatoma Infestans

scholarly journals Molecular Population Genetics and Evolution of the Chagas’ Disease Vector Triatoma infestans (Hemiptera: Reduviidae)

2013 ◽  
Vol 14 (5) ◽  
pp. 316-323 ◽  
Author(s):  
Beatriz García ◽  
Alicia R. Pérez Rosas ◽  
María Blariza ◽  
Carla Grosso ◽  
Cintia Fernández ◽  
...  
Keyword(s):  
Population Genetics ◽  
Chagas Disease ◽  
Triatoma Infestans ◽  
Disease Vector ◽  
Molecular Population Genetics

scholarly journals Intensified Surveillance and Insecticide-based Control of the Chagas Disease Vector Triatoma infestans in the Argentinean Chaco

2013 ◽  
Vol 7 (4) ◽  
pp. e2158 ◽  
Author(s):  
Juan M. Gurevitz ◽  
María Sol Gaspe ◽  
Gustavo F. Enriquez ◽  
Yael M. Provecho ◽  
Uriel Kitron ◽  
...  
Keyword(s):  
Chagas Disease ◽  
Triatoma Infestans ◽  
Disease Vector

scholarly journals The initial success of the Chagas' Disease Control Program: factors contributing to Triatomine infestation

1992 ◽  
Vol 8 (4) ◽  
pp. 391-403 ◽  
Author(s):  
Millicent Fleming-Moran
Keyword(s):  
Chagas Disease ◽  
Control Program ◽  
Triatoma Infestans ◽  
Linear Regression Models ◽  
Disease Vector ◽  
Disease Control Program ◽  
Household Crowding ◽  
Favorable Conditions ◽  
House Infestation ◽  
Regional Comparisons

While the control of the major Chagas' disease vector Triatoma infestans has been achieved in many endemic areas of Brazil, data from the inception of the control program in the Triângulo Mineiro (1976-79) suggest that re-infestation by triatomines occurs under certain favorable conditions. The percentage of houses infested in 500 communities of the Triângulo Mineiro region is compared for two years: 1976 and 1979, using linear regression models. Controlling for three major triatomine vectors, household crowding, house demolition and construction, and infested out-buildings are all independent covariates of house infestation in these communities. While several household factors have been suggested as correlates of infestation, the control program focuses on community-level reductions in infestation, but intra-community or regional comparisons have heretofore been unfeasible. Computerized data are becoming available to identify communities at high risk for re-infestation, and for targeting control-program activities.

scholarly journals Identifying Current and Missing Knowledge in the Control of Pyrethroid-Resistant Triatoma infestans, Vector of Chagas Disease

2017 ◽  
Vol 9 (7) ◽  
pp. 47
Author(s):  
Gonzalo Roca Acevedo ◽  
María Inés Picollo
Keyword(s):  
Chagas Disease ◽  
Chemical Control ◽  
Rational Design ◽  
Pyrethroid Resistance ◽  
Triatoma Infestans ◽  
Vector Transmission ◽  
Pyrethroid Insecticides ◽  
Blood Sucking ◽  
Deltamethrin Resistance ◽  
Metabolic Detoxification

Triatomines are blood-sucking bugs that occur mainly in Latin America. They are vectors of Trypanosoma cruzi, the parasite that causes Chagas disease. Chemical control of Chagas disease´s vectors by using pyrethroid insecticides has been highly successful for the elimination of domestic infestation and consequently the reduction of the vector transmission. However, at the beginning of the 2000s a decrease in the effectiveness of the chemical control of triatomines was detected in several areas from Argentina and Bolivia, particularly in the Gran Chaco eco-region.During the last 15 years, several studies demonstrated the evolution of insecticide resistance in Triatoma infestans and established the presence of different toxicological profiles, the autosomal inherence of resistance, the biological costs of deltamethrin resistance, the expression of deltamethrin resistance thorough the embryonic development, and the main mechanisms of resistance (target-site insensitivity and metabolic detoxification of insecticides).The emergence of pyrethroid resistance coupled with the usual difficulties in sustaining adequate rates of insecticide applications emphasize the need of incorporating other tools for integrated vector and disease control, such as the proposal of the organo-phosphorus insecticide fenitrothion as an alternative chemical strategy for the management of the resistance because it was effective against pyrethroid-resistant populations in laboratory and semi-field trials.New studies on the current situation of presence and spread of resistant populations of triatomines and the acceptance of the use of alternative insecticides are critical requirements in the implementation of strategies for the management of resistance and for the rational design of campaigns oriented to reducing the vector transmission of Chagas’ disease.

scholarly journals Urban infestation by Triatoma infestans (Hemiptera: Reduviidae), an overlooked phenomena for Chagas disease in Argentina

2021 ◽  
Vol 116 ◽  
Author(s):  
Yael Mariana Provecho ◽  
María del Pilar Fernández ◽  
Liliana Salvá ◽  
Sergio Meli ◽  
Florencia Cano ◽  
...  
Keyword(s):  
Chagas Disease ◽  
Triatoma Infestans
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