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https://www.readbyqxmd.com/read/28533956/toxicity-repellency-and-flushing-out-in-triatoma-infestans-hemiptera-reduviidae-exposed-to-the-repellents-deet-and-ir3535
#1
Mercedes M N Reynoso, Emilia A Seccacini, Javier A Calcagno, Eduardo N Zerba, Raúl A Alzogaray
DEET and IR3535 are insect repellents present worldwide in commercial products; their efficacy has been mainly evaluated in mosquitoes. This study compares the toxicological effects and the behavioral responses induced by both repellents on the blood-sucking bug Triatoma infestans Klug (Hemiptera: Reduviidae), one of the main vectors of Chagas disease. When applied topically, the Median Lethal Dose (72 h) for DEET was 220.8 µg/insect. Using IR3535, topical application of 500 µg/insect killed no nymphs. The minimum concentration that produced repellency was the same for both compounds: 1,15 µg/cm(2)...
2017: PeerJ
https://www.readbyqxmd.com/read/28530845/temporal-variation-in-the-abundance-and-timing-of-daily-activity-of-chagas-disease-vector-triatoma-gerstaeckeri-st%C3%A3-l-1859-in-a-natural-habitat-in-the-lower-rio-grande-valley-south-texas
#2
Alfredo Flores, Christopher Vitek, Teresa Feria Arroyo, Brian Lund Fredensborg
Chagas disease caused by Trypanosoma cruzi is a burden to millions of people in South and Central America. A sylvatic life cycle of the parasite exists in the Southern United States, but recent studies indicate an active peri-domestic life cycle of T. cruzi in Texas. The USA-Mexico border region in Texas displays areas of high poverty and sub-standard housing conditions which are important risk factors for a potential spill-over transmission to a domestic life cycle including humans. The objectives of the study were to examine short- and longterm temporal variation in vector activity, and to evaluate the effect of different combinations of attractants on the capture of potential triatomine vectors...
May 22, 2017: Journal of Parasitology
https://www.readbyqxmd.com/read/28527292/-triatoma-dimidiata-in-colombia-distribution-ecology-and-epidemiological-importance
#3
Óscar Quirós-Gómez, Nicolás Jaramillo, Víctor Angulo, Gabriel Parra-Henao
Triatoma dimidiata is an important vector of Chagas disease in Central America and countries of northern South America. In Colombia, it has a wide geographical distribution with reported presence in 14 departments in the Andean, Caribbean, Eastern plains and Upper Magdalena regions, where it occupies different natural and artificial ecotopes. The species is considered a secondary vector in the transmission of Trypanosoma cruzi. Its presence in wild, peridomestic and intradomiciliary habitats in the Andean region, coupled with its ability to move between them, has allowed it to escape the control based on pyrethroids spraying, highlighting its importance in maintaining transmission of the parasite through the potential reinfestation of homes...
June 1, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/28527247/-diversity-of-triatominae-hemiptera-reduviidae-in-santander-colombia-epidemiological-implications
#4
Lyda Esteban, José Mauricio Montes, Víctor Manuel Angulo
INTRODUCTION: Domestic and wild triatomines in the department of Santander have an epidemiological impact, as recently they have been linked to outbreaks of acute Chagas disease. The analysis of their diversity and temporal variation contributes to the understanding of their biology and ecology in one of the most endemic areas of the country. OBJECTIVES: To analyze triatominae diversity in two regions of Santander. MATERIALS AND METHODS: We analyzed the triatomine records for Santander contained in the CINTROP-UIS entomology lab database...
January 24, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/28443980/chagas-disease-national-survey-of-seroprevalence-in-children-under-five-years-of-age-conducted-in-2008
#5
Graciela Russomando, Blanca Cousiño, Zunilda Sanchez, Laura X Franco, Eva M Nara, Lilian Chena, Magaly Martínez, María E Galeano, Lucio Benitez
BACKGROUND: Since the early 1990s, programs to control Chagas disease in South America have focused on eradicating domiciliary Triatoma infestans, the main vector. Seroprevalence studies of the chagasic infection are included as part of the vector control programs; they are essential to assess the impact of vector control measures and to monitor the prevention of vector transmission. OBJECTIVE: To assess the interruption of domiciliary vector transmission of Chagas disease by T...
May 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/28442446/proteomic-and-transcriptomic-analysis-of-saliva-components-from-the-hematophagous-reduviid-triatoma-pallidipennis
#6
María J Hernández-Vargas, Jeovanis Gil, Luis Lozano, Martha Pedraza-Escalona, Ernesto Ortiz, Sergio Encarnación-Guevara, Alejandro Alagón, Gerardo Corzo
Species belonging to the Triatominae subfamily are commonly associated with Chagas disease, as they are potential vectors of the parasite Trypanosoma cruzi. However, their saliva contains a cocktail of diverse anti-hemostatic proteins that prevent blood coagulation, vasodilation and platelet aggregation of blood; components with indisputable therapeutic potential. We performed a transcriptomic and proteomic analyses of salivary glands and protein spots from 2DE gels of milked saliva, respectively, from the Mexican Triatoma pallidipennis...
April 22, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28435013/modeling-chagas-disease-in-chile-from-vector-to-congenital-transmission
#7
Mauricio Canals, Dante Cáceres, Sergio Alvarado, Andrea Canals, Pedro E Cattan
Chagaś disease is a human health problem in Latin America. It is highly prevalent in northern Chile between the Arica-Parinacota and Coquimbo regions, with reported incidence of 3-11/100000 inhabitants and mortality of 0.3-0.4/100000. The interruption of vector transmission was reported in 1999 by means of the elimination of the primary vector, Triatoma infestans, from human dwellings, thus the epidemiologic dynamics of this disease should be modified. Here we model the dynamics of Chagaś disease based on previous models for vector and congenital transmission, propose a model that includes both transmission forms and perform simulations...
April 20, 2017: Bio Systems
https://www.readbyqxmd.com/read/28413725/trypanosoma-cruzi-reservoir-triatomine-vector-co-occurrence-networks-reveal-meta-community-effects-by-synanthropic-mammals-on-geographic-dispersal
#8
Carlos N Ibarra-Cerdeña, Leopoldo Valiente-Banuet, Víctor Sánchez-Cordero, Christopher R Stephens, Janine M Ramsey
Contemporary patterns of land use and global climate change are modifying regional pools of parasite host species. The impact of host community changes on human disease risk, however, is difficult to assess due to a lack of information about zoonotic parasite host assemblages. We have used a recently developed method to infer parasite-host interactions for Chagas Disease (CD) from vector-host co-occurrence networks. Vector-host networks were constructed to analyze topological characteristics of the network and ecological traits of species' nodes, which could provide information regarding parasite regional dispersal in Mexico...
2017: PeerJ
https://www.readbyqxmd.com/read/28407782/triatoma-vitticeps-subcomplex-hemiptera-reduviidae-triatominae-a-new-grouping-of-chagas-disease-vectors-from-south-america
#9
Kaio Cesar Chaboli Alevi, Jader de Oliveira, Maria Tercília Vilela de Azeredo-Oliveira, João Aristeu da Rosa
BACKGROUND: Triatomines have been grouped into complexes and subcomplexes based largely on morphological and geographical distribution. Although these groupings are not formally recognised as taxonomic ranks, they are likely monophyletic. However, recent studies have demonstrated that some subcomplexes from South America did not form monophyletic groups, and reorganisations have been suggested. One suggested reorganisation is to exclude Triatoma vitticeps, T. melanocephala, and T. tibiamaculata from the T...
April 13, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28399279/the-botanical-monoterpenes-linalool-and-eugenol-flush-out-nymphs-of-triatoma-infestans-hemiptera-reduviidae
#10
A N Moretti, E A Seccacini, E N Zerba, D Canale, R A Alzogaray
Monoterpenes are the main components of essential oils. Some members of this chemical family present insecticidal activity. Triatoma infestans (Klug) is the main vector of Chagas disease in Argentina, Bolivia, Paraguay, and Perú. The objective of this work was to evaluate the effect of six monoterpenes (1,8-cineole, eugenol, linalool, menthol, α-terpineol, and thymol) on the locomotor and flushing out activity of T. infestans. A video tracking technique was used to evaluate the locomotor activity of nymphs exposed to different concentrations of these chemicals applied as films on filter paper...
March 29, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28399226/biology-of-triatoma-sherlocki-hemiptera-reduviidae-under-laboratory-conditions-biological-cycle-and-resistance-to-starvation
#11
Vanessa Lima-Neiva, Teresa C M Gonçalves, Leonardo S Bastos, Marcia Gumiel, Nathália C Correia, Catia C Silva, Carlos E Almeida, Jane Costa
Triatoma sherlocki Papa, Jurberg, Carcavallo, Cerqueira & Barata was described in 2002, based on specimens caught in the wild in the municipality of Gentio do Ouro, Bahia, Brazil. In 2009, nymphs and adults were detected inside homes and sylvatic specimens were positive for Trypanosoma cruzi (Chagas). No information on the bionomics of T. sherlocki exists, although such data are considered essential to estimate its vector and colonization potential in domestic environments. Herein, the biological cycle of T...
March 30, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28399199/house-reinfestation-with-triatoma-infestans-hemiptera-reduviidae-after-community-wide-spraying-with-insecticides-in-the-argentine-chaco-a-multifactorial-process
#12
Yael M Provecho, M Sol Gaspe, M Del Pilar Fernández, Ricardo E Gürtler
We investigated the dynamics and underlying causes of house (re)infestation with Triatoma infestans (Klug 1834) after a community-wide residual spraying with pyrethroids in a well-defined rural section of Pampa del Indio municipality (northeastern Argentina) over a 4-yr period. House infestation was assessed by timed manual searches, during insecticide applications, and by opportunistic householders' bug collections. All reinfested houses were selectively re-sprayed with insecticides. The resident population comprised Qom (66...
May 1, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28366189/ictv-virus-taxonomy-profile-dicistroviridae
#13
S M Valles, Y Chen, A E Firth, D M A Guérin, Y Hashimoto, S Herrero, J R de Miranda, E Ryabov, Ictv Report Consortium
Dicistroviridae is a family of small non-enveloped viruses with monopartite, linear, positive-sense RNA genomes of approximately 8-10 kb. Viruses of all classified species infect arthropod hosts, with some having devastating economic consequences, such as acute bee paralysis virus in domesticated honeybees and taura syndrome virus in shrimp farming. Conversely, the host specificity and other desirable traits exhibited by several members of this group make them potential natural enemies for intentional use against arthropod pests, such as triatoma virus against triatomine bugs that vector Chagas disease...
March 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28327800/trypanosoma-cruzi-i-genotype-among-isolates-from-patients-with-chronic-chagas-disease-followed-at-the-evandro-chagas-national-institute-of-infectious-diseases-fiocruz-brazil
#14
Tatiana da Silva Fonseca de Oliveira, Barbara Neves Dos Santos, Tainah Silva Galdino, Alejandro Marcel Hasslocher-Moreno, Otilio Machado Pereira Bastos, Maria Auxiliadora de Sousa
INTRODUCTION: Trypanosoma cruzi is the etiologic agent of Chagas disease in humans, mainly in Latin America. Trypanosome stocks were isolated by hemoculture from patients followed at Evandro Chagas National Institute of Infectious Diseases (FIOCRUZ) and studied using different approaches. METHODS: For species and genotype identification, the stocks were analyzed by parasitological techniques, polymerase chain reaction assays targeted to specific DNA sequences, isoenzyme patterns, besides sequencing of a polymorphic locus of TcSC5D gene (one stock)...
January 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28260529/implementing-a-vector-surveillance-response-system-for-chagas-disease-control-a-4-year-field-trial-in-nicaragua
#15
Kota Yoshioka, Doribel Tercero, Byron Pérez, Jiro Nakamura, Lenin Pérez
BACKGROUND: Chagas disease is one of the neglected tropical diseases (NTDs). International goals for its control involve elimination of vector-borne transmission. Central American countries face challenges in establishing sustainable vector control programmes, since the main vector, Triatoma dimidiata, cannot be eliminated. In 2012, the Ministry of Health in Nicaragua started a field test of a vector surveillance-response system to control domestic vector infestation. This paper reports the main findings from this pilot study...
March 6, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28219669/combined-phylogenetic-and-morphometric-information-to-delimit-and-unify-the-triatoma-brasiliensis-species-complex-and-the-brasiliensis-subcomplex
#16
Jader Oliveira, Paula L Marcet, Daniela M Takiya, Vagner J Mendonça, Tiago Belintani, Maria D Bargues, Lucia Mateo, Vivian Chagas, Elaine Folly-Ramos, Pedro Cordeiro-Estrela, Rodrigo Gurgel-Gonçalves, Jane Costa, João A da Rosa, Carlos E Almeida
"Triatoma brasiliensis species complex" was defined as a monophyletic group of the species: T. brasiliensis, T. juazeirensis, T. melanica, and T. sherlocki. An alternative grouping scheme proposed the concept of "Brasiliensis subcomplex" which included the former species together with T. melanocephala, T. petrocchiae, T. lenti, T. tibiamaculata, and T. vitticeps. To evaluate the relationship among these taxa we combined the results obtained with four mitochondrial genes (12S, 16S, COI and Cytb, adding to 1811bp) and geometric morphometric analysis of wings and heads...
June 2017: Acta Tropica
https://www.readbyqxmd.com/read/28199333/comparative-and-functional-triatomine-genomics-reveals-reductions-and-expansions-in-insecticide-resistance-related-gene-families
#17
Lucila Traverso, Andrés Lavore, Ivana Sierra, Victorio Palacio, Jesús Martinez-Barnetche, José Manuel Latorre-Estivalis, Gaston Mougabure-Cueto, Flavio Francini, Marcelo G Lorenzo, Mario Henry Rodríguez, Sheila Ons, Rolando V Rivera-Pomar
BACKGROUND: Triatomine insects are vectors of Trypanosoma cruzi, a protozoan parasite that is the causative agent of Chagas' disease. This is a neglected disease affecting approximately 8 million people in Latin America. The existence of diverse pyrethroid resistant populations of at least two species demonstrates the potential of triatomines to develop high levels of insecticide resistance. Therefore, the incorporation of strategies for resistance management is a main concern for vector control programs...
February 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28179034/hosts-and-vectors-of-trypanosoma-cruzi-discrete-typing-units-in-the-chagas-disease-endemic-region-of-the-paraguayan-chaco
#18
Nidia Acosta, Elsa López, Michael D Lewis, Martin S Llewellyn, Ana Gómez, Fabiola Román, Michael A Miles, Matthew Yeo
Active Trypanosoma cruzi transmission persists in the Gran Chaco region, which is considered hyperendemic for Chagas disease. Understanding domestic and sylvatic transmission cycles and therefore the relationship between vectors and mammalian hosts is crucial to designing and implementing improved effective control strategies. Here we describe the species of triatomine vectors and the sylvatic mammal reservoirs of T. cruzi, in different localities of the Paraguayan and Bolivian Chaco. We identify the T. cruzi genotypes discrete typing units (DTUs) and provide a map of their geographical distribution...
February 9, 2017: Parasitology
https://www.readbyqxmd.com/read/28167589/trypanosoma-cruzi-agent-of-chagas-disease-in-sympatric-human-and-dog-populations-in-colonias-of-the-lower-rio-grande-valley-of-texas
#19
Rachel Curtis-Robles, Italo B Zecca, Valery Roman-Cruz, Ester S Carbajal, Lisa D Auckland, Isidore Flores, Ann V Millard, Sarah A Hamer
AbstractThe zoonotic, vector-borne parasite Trypanosoma cruzi causes Chagas disease throughout the Americas, but human and veterinary health burdens in the United States are unknown. We conducted a cross-sectional prevalence study in indigent, medically underserved human and cohabiting canine populations of seven south Texas border communities, known as colonias. Defining positivity as those samples that were positive on two or more independent tests, we found 1.3% seroprevalence in 233 humans, including one child born in the United States with only short-duration travel to Mexico...
April 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28148283/spatial-and-temporal-distribution-of-house-infestation-by-triatoma-infestans-in-the-toro-toro-municipality-potosi-bolivia
#20
Jorge Espinoza Echeverria, Antonio Nogales Rodriguez, Mirko Rojas Cortez, Liléia Gonçalves Diotaiuti, David E Gorla
BACKGROUND: Triatoma infestans is the main vector of Trypanosoma cruzi in Bolivia. The species is present both in domestic and peridomestic structures of rural areas, and in wild ecotopes of the Andean valleys and the Great Chaco. The identification of areas persistently showing low and high house infestation by the vector is important for the management of vector control programs. This study aimed at analyzing the temporal and spatial distribution of house infestation by T. infestans in the Toro Toro municipality (Potosi, Bolivia) between 2009 and 2014, and its association with environmental variables...
February 2, 2017: Parasites & Vectors
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