scholarly journals Geographic Distribution of Chagas Disease Vectors in Brazil Based on Ecological Niche Modeling

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Rodrigo Gurgel-Gonçalves ◽  
Cléber Galvão ◽  
Jane Costa ◽  
A. Townsend Peterson
Keyword(s):  
Chagas Disease ◽  
Geographic Distribution ◽  
Disease Transmission ◽  
Ecological Niche Modeling ◽  
Transmission Risk ◽  
Triatoma Infestans ◽  
Ecological Niches ◽  
Triatoma Sordida ◽  
Triatomine Species ◽  
Chagas Disease Vectors

Although Brazil was declared free from Chagas disease transmission by the domestic vectorTriatoma infestans, human acute cases are still being registered based on transmission by native triatomine species. For a better understanding of transmission risk, the geographic distribution of Brazilian triatomines was analyzed. Sixteen out of 62 Brazilian species that both occur in>20 municipalities and present synanthropic tendencies were modeled based on their ecological niches.Panstrongylus geniculatusandP. megistusshowed broad ecological ranges, but most of the species sort out by the biome in which they are distributed:Rhodnius pictipesandR. robustusin the Amazon;R. neglectus,Triatoma sordida, andT. costalimaiin the Cerrado;R. nasutus,P. lutzi,T. brasiliensis,T. pseudomaculata,T. melanocephala, andT. petrocchiaein the Caatinga;T. rubrovariain the southern pampas;T. tibiamaculataandT. vitticepsin the Atlantic Forest. Although most occurrences were recorded in open areas (Cerrado and Caatinga), our results show that all environmental conditions in the country are favorable to one or more of the species analyzed, such that almost nowhere is Chagas transmission risk negligible.

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 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.

Chagas Disease Vectors of Paraguay: Entomoepidemiological Aspects of Triatoma sordida (Stål, 1859) and Development of an Identification Key for Paraguayan Triatomines Based on Cytogenetics Data

2021 ◽  
Author(s):  
Nilsa Elizabeth Gonzalez Britez ◽  
Kaio Cesar Chaboli Alevi ◽  
Ariane Cristina Caris Garcia ◽  
Clara Elena Martínez Purroy ◽  
Cleber Galvão ◽  
...  
Keyword(s):  
Vector Control ◽  
Chagas Disease ◽  
Natural Infection ◽  
Identification Key ◽  
Triatoma Infestans ◽  
Eastern Region ◽  
Control Programs ◽  
Cytogenetic Data ◽  
Triatoma Sordida ◽  
Chagas Disease Vectors

Approximately 150,000 people are living with Chagas disease in Paraguay. Although the country has been since 2008 considered as one of the countries that succeeded in interrupted the vector transmission of Chagas by Triatoma infestans in houses of the eastern region, there are nine other species notified in the country that are potential vectors and also deserve attention from vector control programs. Thus, we carried out an entomoepidemiological study of T. sordida in the eastern and western regions of the country and we developed an identification key for Paraguay's triatomines based on cytogenetic data. Between the years 2003 to 2004, 271 specimens of T. sordida were captured in domestic, peridomestic, and wild ecotopes, with 131 insects caught in the eastern (Alto Paraguay, Boquerón and Pte. Hayes) and 140 in the western region of Paraguay (Guairá and Paraguarí). High rates of peridomicillary infestation were observed for both regions. Besides that, the natural infection of the captured insects was detected by optical microscopy in 12% and 10%, and by PCR in 21% and 20% in the eastern and western regions, respectively. Based on cytogenetic data from nine of ten species notified in Paraguay, an identification key was developed to differentiate all taxa. Thus, given the vectorial importance of T. sordida, we highlight the need for continued attention from Paraguay's vector control programs for this species. Further, we provide a taxonomic key that assists in the correct classification of Paraguayan triatomines.

scholarly journals Evaluation of the impact of chemical control measures and entomological surveillance on Chagas' disease in the counties of Mambaí and Buritinópolis, Goiás State, Brazil

2001 ◽  
Vol 34 (6) ◽  
pp. 549-557 ◽  
Author(s):  
Antonio Carlos Silveira ◽  
Rosaura Peñaranda-Carrillo ◽  
Elias Seixas Lorosa ◽  
João Leite ◽  
Márcio Costa Vinhaes ◽  
...  
Keyword(s):  
Chagas Disease ◽  
Disease Transmission ◽  
Stomach Contents ◽  
Control Measures ◽  
Triatoma Infestans ◽  
Food Sources ◽  
Epidemiological Surveillance ◽  
Entomological Surveillance ◽  
Triatoma Sordida ◽  
The Impact

Epidemiological surveillance activities were implemented in 1980 in Mambaí and Buritinópolis counties, Goiás State. Twenty years later the authors evaluated the impact of these vector control measures on Chagas' disease transmission, based on entomological indicators. Entomological investigation was conducted using the man-hour technique and covering all domiciles. In order to study vector food sources the stomach contents of triatomines were analyzed using the modified precipitins technique. Triatomines were shown to be present in 48 (71.6%) of the 67 locations. Peridomiciliary infestation rates in Mambaí and Buritinópolis were 8.7% and 12.1%, respectively, while intradomiciliary rates were 0.7% and 1.2%. Triatoma sordida was the species identified in 97.3% of all captured specimens. It was also the only species found to be naturally infected with Trypanosoma cruzi. Birds were the most frequent food source (45%) for Triatoma sordida. The most significant result was the complete absence of Triatoma infestans in the two counties.

scholarly journals The impact of climate change on the geographical distribution of two vectors of Chagas disease: implications for the force of infection

2015 ◽  
Vol 370 (1665) ◽  
pp. 20130560 ◽  
Author(s):  
Paula Medone ◽  
Soledad Ceccarelli ◽  
Paul E. Parham ◽  
Andreína Figuera ◽  
Jorge E. Rabinovich
Keyword(s):  
Chagas Disease ◽  
Transmission Risk ◽  
Triatoma Infestans ◽  
Tropical Species ◽  
Climatic Niche ◽  
Force Of Infection ◽  
Chagas Disease Vectors ◽  
Vector Borne ◽  
Human Infections ◽  
The Impact

Chagas disease, caused by the parasite Trypanosoma cruzi , is the most important vector-borne disease in Latin America. The vectors are insects belonging to the Triatominae (Hemiptera, Reduviidae), and are widely distributed in the Americas. Here, we assess the implications of climatic projections for 2050 on the geographical footprint of two of the main Chagas disease vectors: Rhodnius prolixus (tropical species) and Triatoma infestans (temperate species). We estimated the epidemiological implications of current to future transitions in the climatic niche in terms of changes in the force of infection (FOI) on the rural population of two countries: Venezuela (tropical) and Argentina (temperate). The climatic projections for 2050 showed heterogeneous impact on the climatic niches of both vector species, with a decreasing trend of suitability of areas that are currently at high-to-moderate transmission risk. Consequently, climatic projections affected differently the FOI for Chagas disease in Venezuela and Argentina. Despite the heterogeneous results, our main conclusions point out a decreasing trend in the number of new cases of Tr. cruzi human infections per year between current and future conditions using a climatic niche approach.

scholarly journals Structure Determination of Juvenile Hormone from Chagas Disease Vectors, Rhodnius prolixus and Triatoma infestans

2020 ◽  
Vol 49 (5) ◽  
pp. 538-541
Author(s):  
Keiji Matsumoto ◽  
Yoko Yasuno ◽  
Kohei Yasuda ◽  
Tsuyoshi Hayashi ◽  
Shin G. Goto ◽  
...  
Keyword(s):  
Juvenile Hormone ◽  
Chagas Disease ◽  
Structure Determination ◽  
Rhodnius Prolixus ◽  
Triatoma Infestans ◽  
Disease Vectors ◽  
Chagas Disease Vectors

The Triatominae (Hemiptera: Heteroptera: Reduviidae) of Veracruz, Mexico: geographic distribution, taxonomic redescriptions, and a key

Zootaxa ◽  
2012 ◽  
Vol 3487 (1) ◽  
pp. 1 ◽  
Author(s):  
CÉSAR ANTONIO SANDOVAL-RUIZ ◽  
LUIS CERVANTESPEREDO ◽  
FREDY SEVERO MENDOZA-PALMERO ◽  
SERGIO IBÁÑEZ-BERNAL
Keyword(s):  
Literature Review ◽  
Chagas Disease ◽  
Geographic Distribution ◽  
The State ◽  
Triatoma Infestans ◽  
Museum Collections ◽  
Key To Species ◽  
Distribution Maps ◽  
Annotated List ◽  
Triatomine Bugs

An annotated list of the triatomine bugs from Veracruz, Mexico, is presented. The list is mainly based on field collections, but also on literature review and museum collections. Ten species in five genera and two tribes are known in the state. Two species, Triatoma dimidiata (Latreille), the most common and widely distributed, and Triatoma gerstaeckeri (Stål), are the most important vectors of Chagas disease in the region. Panstrongylus rufotuberculatus (Champion), Belminus costarricensis Herrer, Lent & Wygodzinsky, and Eratyrus cuspidatus (Stål) are confined to sylvan habitats in the south of the state. Triatoma rubida (Uhler) probably represent a misidentification. The presence of Meccus pallidipennis Stål, Panstrogylus geniculatus (Latrielle), Triatoma barberi Usinger, and Triatoma infestans (Klug) are fortuitous. GARP distribution maps are provided for T. dimidiata and T. gerstaeckeri. A key to species and photographs of the adults of the ten species are also included.

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.

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