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https://www.readbyqxmd.com/read/28766724/a-methodology-based-on-insecticide-impregnated-filter-paper-for-monitoring-resistance-to-deltamethrin-in-triatoma-infestans-field-populations
#1
C Remón, P Lobbia, E Zerba, G Mougabure-Cueto
The domiciliary presence of Triatoma infestans (Klug) (Hemiptera: Reduviidae) after control interventions was reported in recent years. Toxicological studies showed high levels of resistance to pyrethroids suggesting resistance as one of the main causes of deficient control. The aim of the present study was to develop a protocol to test resistance to deltamethrin in T. infestans collected from the field by discriminate concentration. To evaluate field insects, the effect of age (early vs. later) and nutritional state (starved vs...
August 2, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28724448/systemic-insecticide-treatment-of-the-canine-reservoir-of-trypanosoma-cruzi-induces-high-levels-of-lethality-in-triatoma-infestans-a-principal-vector-of-chagas-disease
#2
Ariel Loza, Adrianna Talaga, Gladys Herbas, Ruben Jair Canaviri, Thalia Cahuasiri, Laura Luck, Alvaro Guibarra, Raquel Goncalves, Juan Antonio Pereira, Sonia A Gomez, Albert Picado, Louisa Alexandra Messenger, Caryn Bern, Orin Courtenay
BACKGROUND: Despite large-scale reductions in Chagas disease prevalence across Central and South America, Trypanosoma cruzi infection remains a considerable public health problem in the Gran Chaco region where vector-borne transmission persists. In these communities, peridomestic animals are major blood-meal sources for triatomines, and household presence of infected dogs increases T. cruzi transmission risk for humans. To address the pressing need for field-friendly, complementary methods to reduce triatomine infestation and interrupt T...
July 19, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28723933/comparative-repeatome-analysis-on-triatoma-infestans-andean-and-non-andean-lineages-main-vector-of-chagas-disease
#3
Sebastián Pita, Francisco Panzera, Pablo Mora, Jesús Vela, Ángeles Cuadrado, Antonio Sánchez, Teresa Palomeque, Pedro Lorite
Triatoma infestans is the most important Chagas disease vector in South America. Two main evolutionary lineages, named Andean and non-Andean, have been recognized by geographical distribution, phenetic and genetic characteristics. One of the main differences is the genomic size, varying over 30% in their haploid DNA content. Here we realize a genome wide analysis to compare the repetitive genome fraction (repeatome) between both lineages in order to identify the main repetitive DNA changes occurred during T...
2017: PloS One
https://www.readbyqxmd.com/read/28722589/silencing-of-two-vitellogenin-genes-inhibits-oviposition-in-the-chagas-disease-vector-triatoma-infestans-hemiptera-reduviidae
#4
María J Blariza, Carla G Grosso, Beatriz A García
RNA interference caused by exogenous double-stranded RNA (dsRNA) is used to downregulate crucial genes to control insects. The reproductive success of all oviparous species depends on vitellogenin (Vg) biosynthesis and its accumulation in the developing oocytes. Adult females of Triatoma infestans were independently injected with two Vg dsRNAs (Vg1 dsRNA or Vg2 dsRNA) or nuclease-free water (control) 24 hours before feeding, and a group of adult females not injected was also analyzed (control). Vg1 and Vg2 messenger RNA silencing was verified by reverse transcription quantitative polymerase chain reaction...
May 30, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28719275/high-triatoma-brasiliensis-densities-and-trypanosoma-cruzi-prevalence-in-domestic-and-peridomestic-habitats-in-the-state-of-rio-grande-do-norte-brazil-the-source-for-chagas-disease-outbreaks
#5
Mauricio Lilioso, Elaine Folly-Ramos, Fabiana Lopes Rocha, Jorge Rabinovich, Claire Capdevielle-Dulac, Myriam Harry, Paula L Marcet, Jane Costa, Carlos Eduardo Almeida
AbstractA total of 2,431 Triatoma brasiliensis were collected from 39 populations of Paraíba (PB) and Rio Grande do Norte (RN) states, Brazil. In PB, Trypanosoma cruzi infection was not detected in either peridomestic or domestic vector populations. In contrast, in RN, T. brasiliensis was detected with high parasite prevalence in these ecotopes (30.7-40.0%). Moreover, peridomicile insect population densities were more than double the average densities of all other settings evaluated (19.17 versus < 8.94 triatomine/man-hour)...
June 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28690145/salivary-gland-transcripts-of-the-kissing-bug-panstrongylus-chinai-a-vector-of-chagas-disease
#6
Hirotomo Kato, Ryan C Jochim, Eduardo A Gomez, Shunsuke Tsunekawa, Jesus G Valenzuela, Yoshihisa Hashiguchi
The saliva of hematophagous arthropods injected during blood feeding contains potent pharmacologically active components to counteract the host hemostatic and inflammatory systems. In the present study, dominant salivary gland transcripts of Panstrongylus chinai, a vector of Chagas disease, were analyzed by sequencing randomly selected clones of the salivary gland cDNA library. This analysis showed that 56.5% of the isolated transcripts coded for putative secreted proteins, of which 73.7% coded for proteins belonging to the lipocalin family...
July 6, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28684375/complete-mitochondrial-genome-of-triatoma-infestans-hemiptera-reduviidae-triatominae-main-vector-of-chagas-disease
#7
Sebastián Pita, Francisco Panzera, Jesús Vela, Pablo Mora, Teresa Palomeque, Pedro Lorite
The complete mitogenome of Triatoma infestans, the main vector of Chagas disease in South America, was obtained by combining Illumina and Sanger sequencing sequence data. The 17,301bp long genome contains 13 protein-coding genes, 22 transfer RNAs, 2 ribosomal RNAs, and a control region. The number, order and orientation of mitochondrial genes are the same as in T. dimidiata, the only Triatominae mt genome published so far. The main differences between both mitogenomes are found in the control region and in the intergenic spacer between the nd1 gene and the tRNA-Ser...
July 3, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28638403/jaburetox-update-on-a-urease-derived-peptide
#8
REVIEW
Arlete Beatriz Becker-Ritt, Camila Saretta Portugal, Célia Regina Carlini
Urease from Canavalia ensiformis seeds was the first enzyme ever to be crystallized, in 1926. These proteins, found in plants, bacteria and fungi, present different biological properties including catalytic hydrolysis of urea, and also enzyme-independent activities, such as induction of exocytosis, pro-inflammatory effects, neurotoxicity, antifungal and insecticidal properties. Urease is toxic to insects and fungi per se but part of this toxicity relies on an internal peptide (~11 kDa), which is released upon digestion of the protein by insect enzymes...
2017: Journal of Venomous Animals and Toxins Including Tropical Diseases
https://www.readbyqxmd.com/read/28636880/behavioral-evidence-of-oxidative-stress-by-hematophagy-in-the-ocellar-system-of-rhodnius-prolixus-st%C3%A3-l-1859-red-eyed-mutants
#9
Carlos Alberto Vija-Suarez, Mario Iván Ortiz, Jorge Molina
The photonegative response to light stimulation in Rhodnius prolixus (Reduviidae, Triatominae) is modulated by compound eyes and ocelli. Screening pigments in the visual system have been shown to protect the cellular structures from the oxidative stress damage produced by blood ingestion and light stimulation. Red-eyed mutants of Rhodnius prolixus lack screening pigments in their compound eyes and ocelli and are exposed to more oxidative stress. Experiments with Rhodnius prolixus and Triatoma infestans red-eyed mutants reared from the first nymphal stage show damage in the retinas of the compound eyes and a decrease in photonegative responses due to light stimulation...
June 19, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28605522/seasonality-and-temperature-dependent-flight-dispersal-of-triatoma-infestans-hemiptera-reduviidae-and-other-vectors-of-chagas-disease-in-western-argentina
#10
Osvaldo Di Iorio, Ricardo E Gürtler
Flight dispersal of Triatominae is affected by climatic conditions and determines the spatiotemporal patterns of house invasion and transmission of Trypanosoma cruzi Chagas (Kinetoplastida: Trypanosomatidae). We investigated the detailed time structure and temperature dependencies of flight occurrence of Triatoma infestans Klug (Hemiptera: Reduviidae) and other triatomine species in a rural village of western Argentina by taking advantage of the attraction of adult triatomines to artificial light sources. Most of the village's streetlight posts were systematically inspected for triatomines twice between sunset and midnight over 425 nights in the spring-summer seasons of 1999-2002, an unprecedented light-trap sampling effort for any triatomine species...
June 9, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28591407/insights-from-tissue-specific-transcriptome-sequencing-analysis-of-triatoma-infestans
#11
Leilane O Gonçalves, de Oliveira Luciana M, C D'Ávila Pessoa Grasielle, Aline Cl Rosa, Marinely G Bustamante, Carlota J Belisário, Daniela M Resende, Lileia G Diotaiuti, Jeronimo C Ruiz
Triatoma infestans is an insect of subfamily Triatominae (Hemiptera: Reduviidae) and an important vector of Trypanosoma cruzi, the etiologic agent of human Chagas disease. In this work we reported a transcriptome assembly and annotation of T. infestans heads obtained by Next Generation Sequencing (NGS) technologies.
June 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/28591255/entomological-survey-in-the-state-of-piau%C3%A3-northeastern-brazil-reveals-intradomiciliary-colonization-of-triatoma-brasiliensis-macromelasoma
#12
Silvia Menezes Dos Santos, Danielle Misael de Sousa, Jessica Pereira Dos Santos, José Felipe Pinheiro do Nascimento Vieira, Teresa Cristina Monte Gonçalves, Jacenir Reis Dos Santos-Mallet, Filipe Anibal Carvalho-Costa
This survey aimed to assess the presence of triatomine vectors of Chagas disease within the rural communities of São João do Piauí, Northeast Brazil. Intradomiciliary and peridomiciliary collection strategies were implemented wherein 279 specimens of Triatoma brasiliensis macromelasoma, both nymph and adult were found in 15 (50%) of the studied homes. Of the intradomiciliary insects, 73 (67.6%) were identified as nymph instars (1st instar [N1]= 6, N2= 14, N3= 28, N4= 7 and N5= 18). In the studied communities, a continuous interaction between triatomine bugs and humans could be shown...
June 1, 2017: Revista do Instituto de Medicina Tropical de São Paulo
https://www.readbyqxmd.com/read/28533956/toxicity-repellency-and-flushing-out-in-triatoma-infestans-hemiptera-reduviidae-exposed-to-the-repellents-deet-and-ir3535
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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