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Infectious Disease: Chagas Disease
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Total 21 results found since Jan 2013.
Integrated vector control of Chagas disease in Guatemala: a case of social innovation in health
ConclusionsWhen social innovation criteria are included in a health control initiative, the community-based research and the interdisciplinary and intersectoral participation facilitate the implementation of the control strategy, the perceived benefits by the community and its empowerment to sustain and share the strategy. The case study provided understanding of the intersectoral and interdisciplinary dynamics in particular contexts, and documented the relevance of innovation criteria in health processes.
Source: Infectious Diseases of Poverty - April 13, 2020 Category: Infectious Diseases Source Type: research
Occurrences of triatomines (Hemiptera: Reduviidae) and first reports of Panstrongylus geniculatus in urban environments in the city of Sao Paulo, Brazil.
Abstract
This note reports on occurrences of triatomine species in the city of Sao Paulo, Brazil, registered between 1988 and 2017. Records of triatomines captured in Sao Paulo are based on specimens received spontaneously from Health Surveillance Centers, Health Centers and Zoonosis Control Centers in the city as well as from citizens. Species were identified morphologically at the Public Health Entomology Laboratory, Faculty of Public Health, University of Sao Paulo, where the triatomines, which are vectors of Chagas disease, were tested for Trypanosoma cruzi infection. The first reported occurrence of triatomin...
Source: Revista do Instituto de Medicina Tropical de Sao Paulo - July 19, 2018 Category: Tropical Medicine Authors: Ceretti-Junior W, Vendrami DP, Matos-Junior MO, Rimoldi-Ribeiro A, Alvarez JV, Marques S, Duarte AN, Silva RAD, Rosa JAD, Marrelli MT Tags: Rev Inst Med Trop Sao Paulo Source Type: research
Excretion/defecation patterns in Triatoma infestans populations that are, respectively, susceptible and resistant to deltamethrin
Abstract
Pyrethroid resistance has been detected in Triatoma infestans (Klug) (Hemiptera: Reduviidae) specimens from different areas of Argentina and Bolivia. Genes conferring resistance can have a pleiotropic effect with epidemiological and evolutionary consequences. This research studied excretion/defecation patterns in deltamethrin‐resistant T. infestans in order to elucidate its biological performance, adaptive consequences and role in the transmission of Chagas' disease. One deltamethrin‐susceptible strain and two deltamethrin‐resistant strains were used. Fifth‐instar nymphs were fed ad libitum and their defe...
Source: Medical and Veterinary Entomology - February 12, 2018 Category: Veterinary Research Authors: P. Lobbia, J. Calcagno, G. Mougabure ‐Cueto Tags: Original Article Source Type: research
Behavioural and electrophysiological responses of Triatoma dimidiata nymphs to conspecific faecal volatiles
Abstract
The behavioural and electrophysiological (electroantennography) responses of the first two instars of Triatoma dimidiata (Hemiptera: Reduviidae) Latreille to fresh and dry faecal headspace volatile extracts from fifth instar conspecific nymphs and synthetic compounds were analysed in this study. Recently emerged nymphs (3–5 days) aggregated around filter paper impregnated with dry faeces and around filter paper impregnated with extracts from both fresh and dry faeces. Older first instars (10–15 days) and second instars aggregated around filter paper impregnated with fresh and dry faeces, and their respecti...
Source: Medical and Veterinary Entomology - September 1, 2017 Category: Veterinary Research Authors: Z. GALVEZ ‐MARROQUIN, L. CRUZ‐LÓPEZ, E. A. MALO, J. M. RAMSEY, J. C. ROJAS Tags: Original Article Source Type: research
Ecological and physiological thermal niches to understand distribution of Chagas disease vectors in Latin America
Abstract
In order to assess how triatomines (Hemiptera, Reduviidae), Chagas disease vectors, are distributed through Latin America, we analysed the relationship between the ecological niche and the limits of the physiological thermal niche in seven species of triatomines. We combined two methodological approaches: species distribution models, and physiological tolerances. First, we modelled the ecological niche and identified the most important abiotic factor for their distribution. Then, thermal tolerance limits were analysed by measuring maximum and minimum critical temperatures, upper lethal temperature, and ‘chill‐...
Source: Medical and Veterinary Entomology - August 30, 2017 Category: Veterinary Research Authors: G. J. DE LA VEGA, P. E. SCHILMAN Tags: Original Article Source Type: research
Diversity of Triatominae (Hemiptera: Reduviidae) in Santander, Colombia: Epidemiological implications.
CONCLUSIONS: Results revealed differences in the diversity of the two regions and the potential of wild species to occupy artificial ecotopes. Triatomines intrusion and the recent involvement of wild species in the transmission of Trypanosoma cruzi emphasize the need to further investigate the ecology of these vectors in order to guide population control strategies.
PMID: 28527247 [PubMed - in process]
Source: Biomedica : Revista del Instituto Nacional de Salud - May 21, 2017 Category: International Medicine & Public Health Tags: Biomedica Source Type: research
Demographic effects of deltamethrin resistance in the Chagas disease vector Triatoma infestans
The objectives of the present study were to describe the demographic consequences of deltamethrin resistance in T. infestans and to establish possible target stages for chemical control in susceptible and resistant colonies. A stage‐classified matrix model was constructed based on the average stage length for susceptible, resistant and reciprocal matings' progeny. The differences between colonies were analysed by prospective and retrospective analysis. The life table parameters indicated reduced fecundity, fertility and population growth in resistant insects. The retrospective analysis suggested the latter was associated...
Source: Medical and Veterinary Entomology - September 27, 2016 Category: Veterinary Research Authors: M. D. GERMANO, M. I. PICOLLO Tags: Original Article Source Type: research
A CO2-Free Synthetic Host-Odor Mixture That Attracts and Captures Triatomines: Effect of Emitted Odorant Ratios
In this study, using a trap olfactometer and an odor blend with constituents similar to those of Sweetscent (delivered from low-density polyethylene sachets) we found that the odorant ratios of the mixtures have a strong effect in the capture of triatomines. The blend with the most efficient combination of odorant ratios evoked ca. 81% capture in two relevant triatomine species. In the case of the most effective odor mixtures, we measured the odor mass emission for the three components of the mixture and therefore were able to estimate the odorant ratios emitted that were responsible for such a high capture performance. Th...
Source: Journal of Medical Entomology - June 29, 2016 Category: Biology Authors: Guidobaldi, F., Guerenstein, P. G. Tags: Behavior and Chemical Ecology Source Type: research
Life Cycle, Feeding, and Defecation Patterns of Panstrongylus chinai (Hemiptera: Reduviidae: Triatominae) Under Laboratory Conditions
The objective of this study was to describe the life cycle, feeding, and defecation patterns of P. chinai in the Loja province within southern Ecuador. To characterize its life cycle, a cohort of 70 individuals was followed from egg to adult. At each stage of development, prefeeding time, feeding time, weight of ingested meal, proportional weight increase, and the time to the first defecation were recorded. Panstrongylus chinai completed its development in 371.4 ± 22.3 d, (95% CI 355.4–387.4), which means that it is likely a univoltine species. Prefeeding time, feeding time, and weight of ingested meal increas...
Source: Journal of Medical Entomology - June 29, 2016 Category: Biology Authors: Mosquera, K. D., Villacis, A. G., Grijalva, M. J. Tags: Development, Life History Source Type: research
Geographical Variation of Deltamethrin Susceptibility of Triatoma infestans (Hemiptera: Reduviidae) in Argentina With Emphasis on a Resistant Focus in the Gran Chaco
Chagas disease is one of the most important parasitic infections in Latin America. The main vector of the protozoan Trypanosoma cruzi in America is Triatoma infestans, a blood-sucking triatomine bug who is widely distributed in the Gran Chaco ecoregion. Control programs in endemic countries are focused in the elimination of triatomine vectors with pyrethroid insecticides. However, chemical control has failed in the Gran Chaco over the last two decades because of several factors. Previous studies have reported the evolution of different levels of resistance to deltamethrin in Tri. infestans. Recently, very high resistance h...
Source: Journal of Medical Entomology - June 29, 2016 Category: Biology Authors: Fronza, G., Toloza, A. C., Picollo, M. I., Spillmann, C., Mougabure-Cueto, G. A. Tags: Vector Control, Pest Management, Resistance, Repellents Source Type: research
Trypanosoma cruzi Infection Prevalence and Bloodmeal Analysis in Triatomine Vectors of Chagas Disease From Rural Peridomestic Locations in Texas, 2013-2014
Protozoan pathogen Trypanosoma cruzi (Chagas, 1909) is the etiologic agent of Chagas disease, which affects millions of people in Latin America. Recently, the disease has been gaining attention in Texas and the southern United States. Transmission cycle of the parasite involves alternating infection between insect vectors and vertebrate hosts (including humans, wildlife, and domestic animals). To evaluate vector T. cruzi parasite burden and feeding patterns, we tested triatomine vectors from 23 central, southern, and northeastern counties of Texas. Out of the 68 submitted specimens, the majority were genetically identified...
Source: Journal of Medical Entomology - June 29, 2016 Category: Biology Authors: Gorchakov, R., Trosclair, L. P., Wozniak, E. J., Feria, P. T., Garcia, M. N., Gunter, S. M., Murray, K. O. Tags: Vector/Pathogen/Host Interaction, Transmission Source Type: research
Behavioral and Toxicological Responses of Rhodnius prolixus (Hemiptera: Reduviidae) to the Insect Repellents DEET and IR3535
This study compares the behavioral and toxicological effects of both substances in fifth-instar nymphs of the blood-sucking bug Rhodnius prolixus Stål (Hemiptera: Reduviidae), one of the main vectors of American trypanosomiasis (Chagas disease). Repellency was quantified using filter paper discs as experimental arenas. Half the discs were treated with solution of repellent in acetone, and the other half with acetone alone. The lowest observed effect level was identical for both substances, 74 µg/cm2. Nymph age (between 1–3 h and 99 d from last ecdysis) had no influence on repellency. Topical application o...
Source: Journal of Medical Entomology - March 8, 2016 Category: Biology Authors: Alzogaray, R. A. Tags: Vector Control, Pest Management, Resistance, Repellents Source Type: research
Infection Rate by Trypanosoma cruzi and Biased Vertebrate Host Selection in the Triatoma dimidiata (Hemiptera: Reduvidae) Species Complex
Chagas disease is a vector-borne disease, caused by the protozoan parasite Trypanosoma cruzi and transmitted by hematophagous insects. Triatoma dimidiata (Hemiptera: Reduvidae (Latreille 1811)) is one of the main vectors, and recent molecular studies indicate that it is a species complex, with potentially different vectorial competences. We investigated the differences in natural T. cruzi infection rate within T. dimidiata complex in Yucatan, Mexico. ITS-2 hybrid bugs had a twofold higher infection rate than ITS-2 Groups 2 and 3 bugs, and this pattern was consistent over time and in several villages. To test if T. dimidiat...
Source: Journal of Medical Entomology - January 12, 2016 Category: Biology Authors: Ramirez-Sierra, M. J., Dumonteil, E. Tags: Arthropod/Host Interaction, Immunity Source Type: research
Selective Insecticide Applications Directed Against Triatoma infestans (Hemiptera: Reduviidae) Affected a Nontarget Secondary Vector of Chagas Disease, Triatoma garciabesi
The control of nondomiciliated triatomine species adapted to peridomestic habitats represents a challenge because they are connected to sylvatic colonies, and pyrethroid insecticides have limited effects outdoors. The effects of residual insecticide spraying have rarely been assessed on secondary triatomines. Triatoma garciabesi (Carcavallo, Martinez, Cichero, Prosen & Ronderos, 1967) is a nontarget vector that inhabits the dry western Chaco region, and a member of the Triatoma sordida Stål 1859 complex. Little is known on the capacity of T. garciabesi to invade and establish viable domestic or peridomestic colon...
Source: Journal of Medical Entomology - January 12, 2016 Category: Biology Authors: Rodriguez-Planes, L. I., Vazquez-Prokopec, G. M., Cecere, M. C., Canale, D. M., Gürtler, R. E. Tags: Vector Control, Pest Management, Resistance, Repellents Source Type: research
