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Yannara Barbosa Nogueira Freitas, Celeste da Silva Freitas de Souza, Jamille Maia E Magalhães, Maressa Laíse Reginaldo de Sousa, Luiz Ney d'Escoffier, Tânia Zaverucha do Valle, Teresa Cristina Monte Gonçalves, Hélcio Reinaldo Gil-Santana, Thais Aaparecida Kazimoto, Sthenia Santos Albano Amora
INTRODUCTION: Chagas disease is caused by the protozoa Trypanosoma cruzi. Its main reservoir is the domestic dog, especially in rural areas with favorable characteristics for vector establishment and proliferation. The aims of this study were to collect data, survey and map the fauna, and identify T. cruzi infection in triatomines, as well as to assess the presence of anti-T. cruzi antibodies in dogs in rural areas of the municipality of Mossoró, Brazil. METHODS: An active entomologic research was conducted to identify adult specimens through an external morphology dichotomous key...
March 2018: Revista da Sociedade Brasileira de Medicina Tropical
Arduina Sofia Ortet de Barros Vasconcelos Fidalgo, Alanna Carla da Costa, José Damião da Silva Filho, Darlan da Silva Cândido, Erlane Chaves Freitas, Laíse Dos Santos Pereira, Mônica Coelho de Andrade, Kátia Cristina Morais Soares Gomes, Cláudia Mendonça Bezerra, Maria de Fátima Oliveira
INTRODUCTION: Chagas disease remains a public health problem in the rural and urban areas of 19 countries in the Americas. METHODS: The aim of the present study was to investigate the Trypanosoma cruzi infection rate of triatomines collected from both intra- and peridomiciliary areas in eleven municipalities of Southeastern Ceará, Brazil, from 2009 to 2015. RESULTS: A total of 32,364 triatomine specimens, including nymphs and adults, were collected, and 31,736 (98...
March 2018: Revista da Sociedade Brasileira de Medicina Tropical
Gabriela Cristina de Carvalho, Mauro Toledo Marrelli, André Barretto Bruno Wilke
Microsatellite loci specifically designed and optimized for secondary vectors and neglected species of mosquitoes are lacking. Cross-species transferability of microsatellite loci between close taxa has been used as a reliable option, being successfully done for Aedes taeniorhynchus Wiedemann (Diptera: Culicidae), Triatoma sordida Stål (Hemiptera: Reduviidae), and Aedes fluviatilis Lutz (Diptera: Culicidae). Nonetheless, prior to the utilization of transferred microsatellites, they must be assessed for their performance and reliability on the target species...
May 15, 2018: Journal of Medical Entomology
Jesús Martínez-Barnetche, Andrés Lavore, Melina Beliera, Juan Téllez-Sosa, Federico A Zumaya-Estrada, Victorio Palacio, Ernestina Godoy-Lozano, Rolando Rivera-Pomar, Mario Henry Rodríguez
BACKGROUND: Chagas disease is a parasitic infection caused by Trypanosoma cruzi. It is an important public health problem affecting around seven to eight million people in the Americas. A large number of hematophagous triatomine insect species, occupying diverse natural and human-modified ecological niches transmit this disease. Triatomines are long-living hemipterans that have evolved to explode different habitats to associate with their vertebrate hosts. Understanding the molecular basis of the extreme physiological conditions including starvation tolerance and longevity could provide insights for developing novel control strategies...
April 27, 2018: BMC Genomics
Sebastián Pita, Pablo Mora, Jesús Vela, Teresa Palomeque, Antonio Sánchez, Francisco Panzera, Pedro Lorite
Chagas disease or American trypanosomiasis affects six to seven million people worldwide, mostly in Latin America. This disease is transmitted by hematophagous insects known as "kissing bugs" (Hemiptera, Triatominae), with Triatoma infestans and Rhodnius prolixus being the two most important vector species. Despite the fact that both species present the same diploid chromosome number (2 n = 22), they have remarkable differences in their total DNA content, chromosome structure and genome organization...
April 24, 2018: International Journal of Molecular Sciences
Soledad Ceccarelli, Agustín Balsalobre, Paula Medone, María Eugenia Cano, Rodrigo Gurgel Gonçalves, Dora Feliciangeli, Darío Vezzani, Cristina Wisnivesky-Colli, David E Gorla, Gerardo A Marti, Jorge E Rabinovich
Trypanosoma cruzi, the causative agent of Chagas disease, is transmitted to mammals - including humans - by insect vectors of the subfamily Triatominae. We present the results of a compilation of triatomine occurrence and complementary ecological data that represents the most complete, integrated and updated database (DataTri) available on triatomine species at a continental scale. This database was assembled by collecting the records of triatomine species published from 1904 to 2017, spanning all American countries with triatomine presence...
April 24, 2018: Scientific Data
Juan Francisco Viso, Patricia Belelli, Matías Machado, Humberto González, Sergio Pantano, María Julia Amundarain, Fernando Zamarreño, Maria Marta Branda, Diego M A Guérin, Marcelo D Costabel
In this work, we assess a previously advanced hypothesis that predicts the existence of ion channels in the capsid of small and non-enveloped icosahedral viruses. With this purpose we examine Triatoma Virus (TrV) as a case study. This virus has a stable capsid under highly acidic conditions but disassembles and releases the genome in alkaline environments. Our calculations range from a subtle sub-atomic proton interchange to the dismantling of a large-scale system representing several million of atoms. Our results provide structure-based explanations for the three roles played by the capsid to enable genome release...
April 16, 2018: PLoS Computational Biology
Dhiraj Kumar Chaudhary, Jaisoo Kim
A Gram-stain-positive, non-motile, creamy-white and rod-coccus shaped actinobacterium, designated strain Ktm-20T , capable of degrading petroleum oil was isolated from oil-contaminated soil. Strain Ktm-20T was able to grow at 15-37 °C, at pH 5.5-10.0 and at 0.0-2.0 % (w/v) NaCl concentration. This strain was taxonomically characterized by a polyphasic approach. The 16S rRNA gene sequence analysis showed that strain Ktm-20T belonged to the genus Rhodococcus and is closely related to Rhodococcus triatomae DSM 44892T , Rhodococcus pedocola UC12T , Rhodococcus wratislaviensis NBRC 100605T , Rhodococcus agglutinans CFH S0262T and Rhodococcus canchipurensis MBRL 353T (98...
April 5, 2018: International Journal of Systematic and Evolutionary Microbiology
Jesus Davila-Barboza, O Karina Villanueva-Segura, Beatriz Lopez-Monroy, Gustavo Ponce-Garcia, Cristina Bobadilla-Utrera, Mayela Montes-Rincon, Zinnia J Molina-Garza, Juan I Arredondo-Jimenez, Iram P Rodriguez-Sanchez, Pablo C Manrique-Saide, Adriana E Flores
Although having five different ways of transmission the vector-borne is the principal way of transmission of Chagas disease, which involves insects of the subfamily Triatominae (Hemiptera: Reduviidae). Nineteen of the 31 species that occur in Mexico are associated with humans, and all are capable of transmitting the disease. Pyrethroids are the insecticides recommended for the control of these vectors in Mexico. We determined the susceptibility to the pyrethroids deltamethrin and permethrin of peridomestic populations of Triatoma mazzottii Usinger and two populations of Triatoma longipennis Usinger in comparison with a reference strain for each species...
April 2, 2018: Insect Science
M F Monteiro, L C O Lisboa, T M Carvalho-Costa, J C Nevoa, C J F Oliveira, J E Serrão, E A Souza
Triatoma lecticularia (Hemiptera: Reduviidae) (Stal, 1859) is a potential vector of Chagas's disease and the comprehension of its reproductive biology is an important tool to control this insect. In the reproductive tract of female insects, the spermatheca plays a crucial role storing male spermatozoa after mating. Whithin insects the spermatheca shows a wide morphological diversity and the analysis of this characteristic can contribute to understand the reproductive biology of the species. This study describes the histology and histochemistry of the spermatheca of T...
March 22, 2018: Brazilian Journal of Biology, Revista Brasleira de Biologia
A C Guerreiro, F M Cecati, C E Ardanáz, O J Donadel, C E Tonn, M E Sosa
In this research, bioactivities toward the Chagas' disease vector Triatoma infestans (Klug) (Hemiptera: Reduviidae) by the essential oil (EO) of Eupatorium buniifolium H. et A. (Asteraceae) are reported. The tests were designed in order to determine ovicidal activity as well as the response to vapor exposure (fumigant) and to topical application (contact toxicity) and as repellent. In the last three bioassays, nymphs from the 3rd and 4th instar were used. The assayed materials were obtained from aerial parts of plants collected during the months of March and December, throughout 4 years, in two locations...
March 23, 2018: Neotropical Entomology
Eric Dumonteil, Maria-Jesus Ramirez-Sierra, Silvia Pérez-Carrillo, Christian Teh-Poot, Claudia Herrera, Sébastien Gourbière, Etienne Waleckx
Trypanosoma cruzi is the agent of Chagas disease, transmitted by hematophagous triatomine vectors. Establishing transmission cycles is key to understand the epidemiology of the disease, but integrative assessments of ecological interactions shaping parasite transmission are still limited. Current approaches also lack sensitivity to assess the full extent of this ecological diversity. Here we developed a metabarcoding approach based on next-generation sequencing to identify triatomine gut microbiome, vertebrate feeding hosts, and parasite diversity and their potential interactions...
March 7, 2018: Scientific Reports
Leandro José Ramos, Janis Lunier de Souza, Cláudio Rodrigues de Souza, Jader de Oliveira, João Aristeu da Rosa, Luis Marcelo Aranha Camargo, Renildo Moura da Cunha, Dionatas Ulises de Oliveira Meneguetti
INTRODUCTION: The occurrence of Triatoma sordida in the Brazilian Western Amazon is reported for the first time. METHODS: Triatoma sordida specimens were collected from a Gallus gallus nest in a peridomiciliary area of Senador Guiomard municipality in the state of Acre. RESULTS: The number of triatomine species in Acre increased from six to seven with this first report of T. sordida in the Brazilian Western Amazon. CONCLUSIONS: The occurrence of T...
January 2018: Revista da Sociedade Brasileira de Medicina Tropical
M Constanza Mannino, M Patricia Juárez, Nicolás Pedrini
The chemical control of Triatoma infestans, the major Chagas disease vector in southern South America, has been threatened in the last years by the emergence of pyrethroid-resistant bug populations. As an alternative approach, the efficacy of the entomopathogenic fungus Beauveria bassiana to control T. infestans populations (regardless their pyrethroid susceptibility) has been demonstrated. Growing research efforts on the interaction between T. infestans and B. bassiana by molecular, ecological, biochemical and behavioral traits has allowed framing such interaction as an evolutionary arms race...
February 27, 2018: Infection, Genetics and Evolution
Mónica D Germano, María I Picollo
Triatoma infestans Klug (Hemiptera: Reduviidae) is the main vector of Chagas disease in Latin America. This insect has been controlled with pyrethroids since the 1980s, although the emergence of resistance to deltamethrin has decreased control success in some areas of the Gran Chaco ecoregion. The response of T. infestans to deltamethrin was evaluated per developmental stage. In addition, we evaluated the possible stage-dependent expression of deltamethrin resistance. The bioassays were conducted by topical application of the insecticide in acetone...
February 20, 2018: Journal of Medical Entomology
Jessica C Nevoa, Maria T Mendes, Marcos V da Silva, Siomar C Soares, Carlo J F Oliveira, José M C Ribeiro
Triatomines are hematophagous arthropod vectors of Trypanosoma cruzi, the causative agent of Chagas Disease. Panstrongylus lignarius, also known as Panstrongylus herreri, is considered one of the most versatile triatomines because it can parasitize different hosts, it is found in different habitats and countries, it has sylvatic, peridomestic and domestic behavior and it is a very important vector of Chagas disease, especially in Peru. Molecules produced and secreted by salivary glands and fat body are considered of important adaptational value for triatomines because, among other functions, they subvert the host haemostatic, inflammatory and immune systems and detoxify or protect them against environmental aggressors...
February 2018: PLoS Neglected Tropical Diseases
Jorge Espinoza Echeverria, Marinely B Bustamante Gomez, Grasielle Caldas D Ávila Pessoa, Mirko Rojas Cortez, Antonio Nogales Rodriguez, Liléia Gonçalves Diotaiuti
BACKGROUND: Chemical control with pyrethroid insecticides has been effective in reducing endemic areas of distribution of Triatoma infestans in the Southern Cone, as well as Bolivia; this had considerably reduced the infestation of households in a large part of the territory. Nowadays, areas such as the Chaco and the Inter-Andean Valleys are regions where the reach of vector control strategies is becoming limited, and infestations of insecticide-treated households are reported more often...
February 17, 2018: Parasites & Vectors
Irving J May-Concha, Leopoldo C Cruz-López, Julio C Rojas, Janine M Ramsey
BACKGROUND: The Triatoma phyllosoma complex of Trypanosoma cruzi vectors (Triatominae: Reduviidae) is distributed in both Neotropical and Nearctic bioregions of Mexico. METHODS: Volatile organic compounds emitted by disturbed Triatoma longipennis, Triatoma pallidipennis and Triatoma phyllosoma, and from their Brindley's and metasternal glands, were identified using solid-phase microextraction coupled with gas chromatography-mass spectrometry. RESULTS: Disturbed bugs and the metasternal glands from T...
February 17, 2018: Parasites & Vectors
Ana E Gutiérrez-Cabrera, Wesley F Zandberg, Edgar Zenteno, Mario H Rodríguez, Bertha Espinoza, Carl Lowenberger
Trypanosoma cruzi, the causative agent of Chagas disease, interacts with molecules in the midgut of its insect vector to multiply and reach the infective stage. Many studies suggest that the parasite binds to midgut-specific glycans. We identified several glycoproteins expressed in the intestine and perimicrovillar membrane (PMM) of Triatoma (Meccus) pallidipennis under different feeding conditions. In order to assess changes in protein-linked glycans, we performed lectin and immunoblot analyses on glycoprotein extracts from these intestinal tissues using well-characterized lectins, and an antibody, which collectively recognize a wide range of different glycans epitopes...
February 15, 2018: Insect Science
P Lobbia, J Calcagno, G Mougabure-Cueto
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...
February 12, 2018: Medical and Veterinary Entomology
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