scholarly journals Comprehensive Survey of Domiciliary Triatomine Species Capable of Transmitting Chagas Disease in Southern Ecuador

2015 ◽  
Vol 9 (10) ◽  
pp. e0004142 ◽  
Author(s):  
Mario J. Grijalva ◽  
Anita G. Villacis ◽  
Sofia Ocaña-Mayorga ◽  
Cesar A. Yumiseva ◽  
Ana L. Moncayo ◽  
...  
Keyword(s):  
Chagas Disease ◽  
Triatomine Species ◽  
Southern Ecuador ◽  
Comprehensive Survey

scholarly journals Potential Distribution of Chagas Disease Vectors (Hemiptera, Reduviidae, Triatominae) in Colombia, Based on Ecological Niche Modeling

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Gabriel Parra-Henao ◽  
Laura C. Suárez-Escudero ◽  
Sebastián González-Caro
Keyword(s):  
Chagas Disease ◽  
Sierra Nevada ◽  
Geographic Distribution ◽  
Ecological Niche ◽  
Ecological Niche Modeling ◽  
Climatic Factors ◽  
Niche Modeling ◽  
Triatomine Species ◽  
Local Risk ◽  
And Control

Ecological niche modeling of Triatominae bugs allow us to establish the local risk of transmission of the parasiteTrypanosoma cruzi,which causes Chagas disease.This information could help to guide health authority recommendations on infection monitoring, prevention, and control. In this study, we estimated the geographic distribution of triatomine species in Colombia and identified the relationship between landscape structure and climatic factors influencing their occurrence. A total of 2451 records of 4 triatomine species (Panstrongylus geniculatus,Rhodnius pallescens,R. prolixus, andTriatoma maculata) were analyzed.The variables that provided more information to explain the ecologic niche of these vectors were related to precipitation, altitude, and temperature. We found that the species with the broadest potential geographic distribution wereP. geniculatus,R. pallescens, andR. prolixus. In general, the models predicted the highest occurrence probability of these vectors in the eastern slope of the Eastern Cordillera, the southern region of the Magdalena valley, and the Sierra Nevada of Santa Marta.

scholarly journals Using the health belief model to identify communication opportunities to prevent Chagas disease in Southern Ecuador

2018 ◽  
Vol 12 (9) ◽  
pp. e0006841 ◽  
Author(s):  
Nelson M. Patterson ◽  
Benjamin R. Bates ◽  
Amy E. Chadwick ◽  
Claudia Nieto-Sanchez ◽  
Mario J. Grijalva
Keyword(s):  
Health Belief Model ◽  
Chagas Disease ◽  
Health Belief ◽  
Southern Ecuador ◽  
Belief Model ◽  
The Health Belief Model

scholarly journals Positive deviance study to inform a Chagas disease control program in southern Ecuador

2015 ◽  
Vol 110 (3) ◽  
pp. 299-309 ◽  
Author(s):  
Claudia Nieto-Sanchez ◽  
Esteban G Baus ◽  
Darwin Guerrero ◽  
Mario J Grijalva
Keyword(s):  
Disease Control ◽  
Chagas Disease ◽  
Control Program ◽  
Positive Deviance ◽  
Disease Control Program ◽  
Southern Ecuador

scholarly journals First Report ofAprostocetus asthenogmus(Hymenoptera: Eulophidae) in South America and Parasitizing Eggs of Triatominae Vectors of Chagas Disease

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Claudiney Biral dos Santos ◽  
Marcelo Teixeira Tavares ◽  
Gustavo Rocha Leite ◽  
Adelson Luiz Ferreira ◽  
Leonardo de Souza Rocha ◽  
...  
Keyword(s):  
South America ◽  
Chagas Disease ◽  
Biological Control Agent ◽  
Control Agent ◽  
Triatoma Infestans ◽  
Disease Vectors ◽  
Parasitoid Species ◽  
Triatomine Species ◽  
Chagas Disease Vectors ◽  
First Time

We report for the first time the parasitism of eggs of two triatomine Chagas disease vectors,Triatoma infestansandT. vitticeps, by the microhymenopterous parasitoidAprostocetus asthenogmus. We also describe the first identification of this parasitoid in South America.A. asthenogmuswere captured near unparasitized triatomine colonies in the municipality of Vitória, state of Espírito Santo, Brazil, and placed into pots with recently laid triatomine eggs. After 24 days, we observed wasps emerging fromT. infestansandT. vitticepseggs. Several characteristics of this parasitoid species suggest that it could be a potential biological control agent of triatomine species.

scholarly journals The occurrence of synanthropic triatomines in Bahia, Brazil: what changed after 40 years of the vector-control program?

2020 ◽  
Author(s):  
Gilmar Ribeiro ◽  
Cristiane Medeiros Moraes de Carvalho ◽  
Renato Freitas de Araújo ◽  
Fernanda Cardoso Lanza ◽  
Diego Lopes Paim Miranda ◽  
...  
Keyword(s):  
Vector Control ◽  
Chagas Disease ◽  
Relative Abundance ◽  
Disease Transmission ◽  
Control Program ◽  
The State ◽  
Triatoma Infestans ◽  
Entomological Surveillance ◽  
Triatomine Species ◽  
Vector Control Program

Abstract Background: This study presents a descriptive analysis of the occurrence of synanthropic triatomine species in the state of Bahia, before and after the implementation of the vector control program. Methods: Occurrence and number of collected specimens in the municipalities were analyzed in two periods: (A) 1957 to 1971, before systematic vector control actions; and (B) 2006 to 2019, after the certification of interruption of Chagas disease transmission by Triatoma infestans. Results: In total, 17 species were recorded during period A and 21 during period B. Panstrongylus megistus was the most frequent species in period A (42%), while Triatoma pseudomaculata (42%) and T. sordida (38%) were more frequent in period B. In period A, T. infestans was found in 26 (9%) municipalities, and in period B it was found in 7 (2%). During period B, most triatomines (88%) were captured at the peridomestic habitats, with a predominance of T. sordida (85%). Species with greatest relative abundance within the household were T. sordida (49%), T. brasiliensis (27%), and T. pseudomaculata (15%). Conclusions: We have observed a clear reduction in the occurrence of P. megistus and T. infestans and an increase in the relative abundance and geographical distribution of T. sordida and T. pseudomaculata after 40 years of the vector-control program. High frequency of other triatomine species in the municipalities of the state of Bahia and a great abundance of T. sordida in recent years, highlight the need to reinforce permanent entomological surveillance actions for Chagas disease.

scholarly journals Trends in Taxonomy of Chagas Disease Vectors (Hemiptera, Reduviidae, Triatominae): From Linnaean to Integrative Taxonomy

Pathogens ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1627
Author(s):  
Kaio Cesar Chaboli Alevi ◽  
Jader de Oliveira ◽  
Dayse da Silva Rocha ◽  
Cleber Galvão
Keyword(s):  
Chagas Disease ◽  
State Of The Art ◽  
Integrative Taxonomy ◽  
Disease Vectors ◽  
Neglected Tropical Disease ◽  
Cryptic Speciation ◽  
Triatomine Species ◽  
Chagas Disease Vectors ◽  
First Time ◽  
Five Tribes

Chagas disease is a neglected tropical disease caused by the protozoan Trypanosoma cruzi and transmitted mainly by members of the subfamily Triatominae. There are currently 157 species, grouped into 18 genera and five tribes. Most descriptions of triatomine species are based on classical taxonomy. Facing evolutionary (cryptic speciation and phenotypic plasticity) and taxonomic (more than 190 synonymizations) problems, it is evident that integrative taxonomy studies are an important and necessary trend for this group of vectors. Almost two-and-a-half centuries after the description of the first species, we present for the first time the state-of-the-art taxonomy of the whole subfamily, covering from the initial classic studies to the use of integrative taxonomy.

scholarly journals Do the new triatomine species pose new challenges or strategies for monitoring Chagas disease? An overview from 1979-2021

2021 ◽  
Vol 116 ◽  
Author(s):  
Jane Costa ◽  
Carolina Dale ◽  
Cleber Galvão ◽  
Carlos Eduardo Almeida ◽  
Jean Pierre Dujardin
Keyword(s):  
Chagas Disease ◽  
Triatomine Species ◽  
New Challenges

scholarly journals Lethality of triatomines (Hemiptera: Reduviiae), vectors of Chagas' disease, feeding on blood baits containing synthetic insecticides, under laboratory conditions

1991 ◽  
Vol 33 (6) ◽  
pp. 427-433 ◽  
Author(s):  
Marli Maria Lima ◽  
Luis Rey ◽  
Rubens Pinto de Mello
Keyword(s):  
Chagas Disease ◽  
Laboratory Study ◽  
Room Temperature ◽  
Oral Route ◽  
Triatoma Infestans ◽  
Active Principle ◽  
Defibrinated Sheep Blood ◽  
Panstrongylus Megistus ◽  
Killing Rate ◽  
Triatomine Species

A laboratory study was conducted to test the toxicity of synthetic insecticides added to defibrinated sheep blood kept at room temperature and offered as food to the following triatomine species: Triatoma infestans, Panstrongylus megistus, Triatoma vitticeps, Triatoma pseudomaculata, Triatoma brasiliensis and Rhodnius prolixus. The insecticides used, at a concentration of 1g/l, were: HCH, DDT, Malathion and Trichlorfon, and the lethalithy observed at the end of a 7-day period varied according to the active principle of each. HCH was the most effective by the oral route, killing 100% of the insects, except P. megistus (95.7%) and T. pseudomaculata (94.1%). Trichlorfon killed the insects at rates ranging from 71.8% (T. vitticeps) to 98% (R. prolixus). Malathion was slightly less efficient, killing the insects at rates from 56.8% (T. vitticeps) to 97% (T.brasiliensis). DDT was the least effective, with a killing rate of 10% (T. vitticeps) to 75% (T.brasiliensis). Since the tests were performed at room temperature, we suggest that baits of this type should be tried for the control of triatomines in the field.

scholarly journals Chromosome homogeneity in populations of Triatoma brasiliensis Neiva 1911 (Hemiptera - Reduviidae - Triatominae)

2000 ◽  
Vol 16 (suppl 2) ◽  
pp. S83-S88 ◽  
Author(s):  
Francisco Panzera ◽  
Ruben Pérez ◽  
Paula Nicolini ◽  
Sonia Hornos ◽  
Jane Costa ◽  
...  
Keyword(s):  
Chagas Disease ◽  
Genetic Differences ◽  
Chromosome Behavior ◽  
Specific Chromosome ◽  
Chromosomal Organization ◽  
Meiotic Process ◽  
Chromosome Differentiation ◽  
Semiarid Zone ◽  
Triatomine Species

Triatoma brasiliensis is the most important vector of Chagas disease in the semiarid zone of the Northeast of Brazil. Several authors have reported the occurrence of four chromatic patterns with morphological, ecological, and genetic differences. In order to determine the existence of cytogenetic differentiation between these chromatic forms, we analyzed their karyotypes and the chromosome behavior during the male meiotic process. Triatoma brasiliensis shows distinct and specific chromosome characteristics, which differ from those observed in all other triatomine species. However, no cytogenetic differences were observed between the four chromatic forms of T. brasiliensis. The lack of chromosome differentiation among them could indicate that the populations of this species are in a process of differentiation that does not involve their chromosomal organization.

scholarly journals Epidemiologic studies of chagas' disease in the urban zone of Teresina. State of Piauí, northeastern Brazil

1984 ◽  
Vol 17 (4) ◽  
pp. 199-203 ◽  
Author(s):  
Dalva N. da C. Bento ◽  
Ana Z. C. L Branco ◽  
Marise R. Freitas ◽  
Artur da S. Pinto
Keyword(s):  
Chagas Disease ◽  
Epidemiologic Studies ◽  
Northeastern Brazil ◽  
Palm Tree ◽  
Natural Focus ◽  
Predominant Species ◽  
Palm Trees ◽  
Urban Zone ◽  
Triatomine Species ◽  
Infection Index

The triatomine species Rhodnius nasutus and Triatoma pseudomaculata were captured on palm trees Orbignya martiana "babaçu ", in the urban zone of Teresina. This kind of palm tree is largely distributed in Piauí State. The predominant species was R. nasutus; the young in stars predominated. The infestation index of palm trees and the infection index of triatomines by flagellates were 96.0 ana 29.1%, respectively. Marsupiais, bats and a rodent were captured in palm trees. The flagellates found in both triatomines ana marsupiais were morphologically and biologically indistinguishable from Trypanosoma cruzi. Forty seven percent (481/1,025) of triatomines were found concentrated in six palm trees where marsupiais circulated. Of the total of 1,025 triatomines 230 (22%) were infected by flagellates and 53.0% (123/230) of these infected triatomines were present in the same six palm trees. No evidence of triatomine domiciliation or human transmission was observed in the houses in the vicinity of palm trees. The results suggest that marsupiais play an important role in the life-cycle of T. cruzi in this region. The natural focus of Chagas' disease, demonstrated in the present study could represent a potential epidemiological threat.

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