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https://www.readbyqxmd.com/read/28199333/comparative-and-functional-triatomine-genomics-reveals-reductions-and-expansions-in-insecticide-resistance-related-gene-families
#1
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
#2
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
#3
Rachel Curtis-Robles, Italo B Zecca, Valery Roman-Cruz, Ester S Carbajal, Lisa D Auckland, Isidore Flores, Ann V Millard, Sarah A Hamer
The 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...
February 6, 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
#4
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
https://www.readbyqxmd.com/read/28145576/differences-in-competitive-ability-for-the-occupancy-of-shelters-in-triatomines
#5
C A Zacharias, S A Minoli, G Manrique
Triatomines (Hemiptera: Reduviidae: Triatominae) are nocturnal blood-sucking insects. During daylight hours they remain in an akinetic state inside their shelters, whereas at dusk they become active and move outside. When they are outside their shelters during the photophase, triatomines are vulnerable to diurnal predators and the period just before dawn is critical to their survival. This work analyses the existence of competitive interactions involved in the occupancy of shelters by triatomines. Behavioural assays were performed in which nymphs of different stages, nutritional status or species were released in an experimental arena containing a space-limited artificial shelter...
February 1, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28143573/the-modern-morphometric-approach-to-identify-eggs-of-triatominae
#6
Soledad Santillán-Guayasamín, Anita G Villacís, Mario J Grijalva, Jean-Pierre Dujardin
BACKGROUND: Egg morphometrics in the Triatominae has proved to be informative for distinguishing tribes or genera, and has been based generally on traditional morphometrics. However, more resolution is required, allowing species or even population recognition, because the presence of eggs in the domicile could be related to the species ability to colonize human dwellings, suggesting its importance as a vector. RESULTS: We explored the resolution of modern morphometric methods to distinguish not only tribes and genera, but also species or geographic populations in some important Triatominae...
January 31, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28125121/a-motorized-vehicle-mounted-sprayer-as-a-new-tool-for-chagas-disease-vector-control
#7
Ana Laura Carbajal-de-la-Fuente, Patricia Lencina, Cynthia Spillmann, Ricardo Esteban Gürtler
Residual insecticide spraying still is the main tool used to suppress house infestations with Chagas disease vectors. While manual compression sprayers (MCS) have traditionally been used in Latin America, Mendoza's vector control program from Argentina introduced the use of a modified motorized vehicle-mounted sprayer (VMS) with apparent advantages over MCS. We conducted a randomized intervention trial to evaluate the effectiveness and selected components of the performance of MCS and VMS. We assessed house infestation by Triatoma infestans in 76 previously-infested houses at 0, 1, 4 and 12 months postintervention...
January 23, 2017: Cadernos de Saúde Pública
https://www.readbyqxmd.com/read/28120213/genetic-characterization-of-residual-triatoma-infestans-populations-from-brazil-by-microsatellite
#8
Carlota Josefovicz Belisário, Grasielle Caldas D'Avila Pessoa, Eduardo Melos Silva, Aline Cristine Luiz Rosa, Rafaela Elias Ferreira, Cleonara Bedin, Tania Wilhelms, Fernanda de Mello, Helder Silveira Coutinho, Eduardo Lins Oyama Fonseca, Roberto Fonseca Dos Santos, Vera Lucia Cortiço Corrêa Rodrigues, João Carlos Pinto Dias, Liléia Diotaiuti
In spite of long-term efforts to eliminate Triatoma infestans (Klug 1834) from Brazil, residual foci still persist in the states of Bahia and Rio Grande do Sul. Data on the genetic variability and structuring of these populations are however lacking. Using nine microsatellite loci, we characterized one residual T. infestans population from Bahia and four from Rio Grande do Sul, and compared them with bugs originally from an older focus in São Paulo; 224 bugs were genotyped. The number of alleles per locus ranged from 5 to 11...
January 24, 2017: Genetica
https://www.readbyqxmd.com/read/28117911/sperm-dimorphism-in-the-triatoma-brasiliensis-species-complex-and-its-applications
#9
A F Baffa, D C P Camara, J R Santos-Mallet, E R Dasilva, J Costa, S P C Freitas
Morphological and structural features of the sperm of the Triatoma brasiliensis Neiva, 1911 (Hemiptera: Reduviidae) species complex were examined in this first study investigating the sperm of Heteroptera and the genus Triatoma. Males were dissected and their seminal vesicles removed. For measurement, seminal vesicles were squashed on glass slides, spread, fixed and observed under a photomicroscope. The images were analysed and measures of sperm were made. Data were analysed using one-way analysis of variance and Tukey's test to detect differentiation among taxa...
January 24, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28115670/application-of-inter-simple-sequence-repeat-markers-in-the-analysis-of-populations-of-the-chagas-disease-vector-triatoma-infestans-hemiptera-reduviidae
#10
Alicia R Pérez de Rosas, María F Restelli, Cintia J Fernández, María J Blariza, Beatriz A García
Here we apply inter-simple sequence repeat (ISSR) markers to explore the fine-scale genetic structure and dispersal in populations of Triatoma infestans Five selected primers from 30 primers were used to amplify ISSRs by polymerase chain reaction. A total of 90 polymorphic bands were detected across 134 individuals captured from 11 peridomestic sites from the locality of San Martín (Capayán Department, Catamarca Province, Argentina). Significant levels of genetic differentiation suggest limited gene flow among sampling sites...
January 23, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28103294/community-based-entomological-surveillance-reveals-urban-foci-of-chagas-disease-vectors-in-sobral-state-of-cear%C3%A3-northeastern-brazil
#11
Cynara Carvalho Parente, Fernando S M Bezerra, Plutarco I Parente, Raimundo V Dias-Neto, Samanta C C Xavier, Alberto N Ramos, Filipe A Carvalho-Costa, Marli M Lima
BACKGROUND: The aim of this work was to explore the potential risk of vector-borne Chagas disease in urban districts in northeastern Brazil, by analyzing the spatiotemporal distributions and natural infection rates with Trypanosoma cruzi of triatomine species captured in recent years. The main motivation of this work was an acute human case of Chagas disease reported in 2008 in the municipality of Sobral. METHODOLOGY/PRINCIPAL FINDINGS: We analyzed data from community-based entomological surveillance carried out from 2010 to 2014...
2017: PloS One
https://www.readbyqxmd.com/read/28095511/epidemiology-and-molecular-typing-of-trypanosoma-cruzi-in-naturally-infected-hound-dogs-and-associated-triatomine-vectors-in-texas-usa
#12
Rachel Curtis-Robles, Karen F Snowden, Brandon Dominguez, Lewis Dinges, Sandy Rodgers, Glennon Mays, Sarah A Hamer
BACKGROUND: Trypanosoma cruzi is the etiologic agent of Chagas disease throughout the Americas. Few population-level studies have examined the epidemiology of canine infection and strain types of T. cruzi that infect canines in the USA. We conducted a cross-sectional study of T. cruzi infection in working hound dogs in south central Texas, including analysis of triatomine vectors collected within kennel environments. METHODOLOGY/PRINCIPLE FINDINGS: Paired IFA and Chagas Stat-Pak serological testing showed an overall seroprevalence of 57...
January 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28091763/the-prevalence-of-trypanosoma-cruzi-the-causal-agent-of-chagas-disease-in-texas-rodent-populations
#13
Adriana Aleman, Trina Guerra, Troy J Maikis, Matthew T Milholland, Ivan Castro-Arellano, Michael R J Forstner, Dittmar Hahn
Rodent species were assessed as potential hosts of Trypanosoma cruzi, the etiologic agent of Chagas disease, from five sites throughout Texas in sylvan and disturbed habitats. A total of 592 rodents were captured, resulting in a wide taxonomic representation of 11 genera and 15 species. Heart samples of 543 individuals were successfully analyzed by SybrGreen-based quantitative PCR (qPCR) targeting a 166 bp fragment of satellite DNA of T. cruzi. Eight rodents representing six species from six genera and two families were infected with T...
January 13, 2017: EcoHealth
https://www.readbyqxmd.com/read/28077635/virion-structure-of-black-queen-cell-virus-a-common-honeybee-pathogen
#14
Radovan Spurny, Antonín Přidal, Lenka Pálková, Hoa Khanh Tran Kiem, Joachim R de Miranda, Pavel Plevka
: Viral diseases are a major threat to honeybee (Apis mellifera) populations world-wide and therefore an important factor in reliable crop pollination and food security. Black queen cell virus (BQCV) is the etiological agent of a fatal disease of honeybee queen larvae and pupae. The virus belongs to the genus Triatovirus from the family Dicistroviridae that is part of the order Picornavirales Here we present a crystal structure of BQCV determined to a resolution of 3.4 Å. The virion is formed by sixty copies of each of the major capsid proteins VP1, VP2, and VP3, however there is no density corresponding to a 75-residue-long minor capsid protein VP4 encoded by the BQCV genome...
January 11, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28040563/wing-geometry-of-triatoma-sordida-hemiptera-reduviidae-populations-from-brazil
#15
Daniel Pagotto Vendrami, Marcos Takashi Obara, Rodrigo Gurgel-Gonçalves, Walter Ceretti-Junior, Mauro Toledo Marrelli
Triatoma sordida has a widespread distribution in Argentina, Bolivia, Brazil, Paraguay, and Uruguay and is frequently found in peridomestic environments. We investigated size and shape variability of T. sordida wings across Brazil. Field-collected adults from twelve populations were studied. For each individual female, seven landmarks on the right wing were digitalized. Shape variables derived from Procrustes superimposition were used in Principal Component Analysis (PCA). Wing size and shape variations among populations was explored by means of ANOVA...
December 28, 2016: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28011736/toxicological-enzymatic-and-molecular-assessment-of-the-insecticide-susceptibility-profile-of-triatoma-infestans-hemiptera-reduviidae-triatominae-populations-from-rural-communities-of-santa-cruz-bolivia
#16
Pablo L Santo-Orihuela, Claudia V Vassena, Guillermo Carvajal, Eva Clark, Silvio Menacho, Ricardo Bozo, Robert H Gilman, Caryn Bern, Paula L Marcet
A wide range of insecticide resistance profiles has been reported across Bolivian domestic and sylvatic populations of Triatoma infestans (Klug, 1834) (Hemiptera, Reduviidae), including some with levels proven to be a threat for vector control. In this work, the insecticide profile of domestic T. infestans was studied with standardized toxicological bioassays, in an area that has not undergone consistent vector control. F1 first-instar nymphs hatched in laboratory from bugs captured in three communities from the Santa Cruz Department were evaluated with different insecticides...
December 22, 2016: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28005972/morphological-and-genetic-differentiation-within-the-southernmost-vector-of-chagas-disease-triatoma-patagonica-hemiptera-reduviidae
#17
Julieta Nattero, Sebastián Pita, Lucía Calleros, Liliana Crocco, Yanina Panzera, Claudia S Rodríguez, Francisco Panzera
The epidemiological importance of Chagas disease vectors largely depends on their spreading ability and adaptation to domestic habitats. Triatoma patagonica is a secondary vector of Chagas disease endemic of Argentina, and it has been found colonizing domiciles and most commonly peridomiciliary structures in several Argentine provinces and morphological variation along its distribution range have been described. To asses if population differentiation represents geographic variants or true biological species, multiple genetic and phenotypic approaches and laboratory cross-breeding were performed in T...
2016: PloS One
https://www.readbyqxmd.com/read/27993629/neuropeptidomics-in-triatoma-infestans-comparative-transcriptomic-analysis-among-triatomines
#18
Lucila Traverso, Ivana Sierra, Marcos Sterkel, Flavio Francini, Sheila Ons
Chagas' disease, affecting up to 6-7 million people worldwide, is transmitted to humans through the feces of triatomine kissing bugs. From these, Rhodnius prolixus, Triatoma dimidiata, Triatoma infestans and Triatoma pallidipennis are important vectors distributed throughout the Latin American subcontinent. Resistance to pyrethroids has been developed by some triatomine populations, especially T. infestans, obstructing their control. Given their role in the regulation of physiological processes, neuroendocrine-derived factors have been proposed as a source of molecular targets for new-generation insecticides...
December 18, 2016: Journal of Physiology, Paris
https://www.readbyqxmd.com/read/27938415/triatomine-bugs-their-microbiota-and-trypanosoma-cruzi-asymmetric-responses-of-bacteria-to-an-infected-blood-meal
#19
Sebastián Díaz, Bianca Villavicencio, Nathália Correia, Jane Costa, Karen L Haag
BACKGROUND: Triatomine bugs (Hemiptera: Reduviidae) are vectors of the flagellate Trypanosoma cruzi, the causative agent of Chagas disease. The study of triatomine gut microbiota has gained relevance in the last years due to its possible role in vector competence and prospective use in control strategies. The objective of this study is to examine changes in the gut microbiota composition of triatomines in response to a T. cruzi-infected blood meal and identifying key factors determining those changes...
December 9, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27938380/effect-of-the-saliva-from-different-triatomine-species-on-the-biology-and-immunity-of-tlr-4-ligand-and-trypanosoma-cruzi-stimulated-dendritic-cells
#20
Maria Tays Mendes, Tamires Marielem Carvalho-Costa, Marcos Vinicius da Silva, Ana Carolina Borella Marfil Anhê, Rafaela Mano Guimarães, Thiago Alvares da Costa, Luis Eduardo Ramirez, Virmondes Rodrigues, Carlo Jose Freire Oliveira
BACKGROUND: Triatomines are blood-sucking vectors of Trypanosoma cruzi, the causative agent of Chagas disease. During feeding, triatomines surpass the skin host response through biomolecules present in their saliva. Dendritic cells (DCs) play a crucial role in the induction of the protection to aggressive agents, including blood-sucking arthropods. Here, we evaluated if salivary components of triatomines from different genera evade the host immunity by modulating the biology and the function of LPS- or T...
December 9, 2016: Parasites & Vectors
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