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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
#1
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
#2
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 17, 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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
https://www.readbyqxmd.com/read/27903288/untangling-the-transmission-dynamics-of-primary-and-secondary-vectors-of-trypanosoma-cruzi-in-colombia-parasite-infection-feeding-sources-and-discrete-typing-units
#11
Carolina Hernández, Camilo Salazar, Helena Brochero, Aníbal Teherán, Luz Stella Buitrago, Mauricio Vera, Hugo Soto, Zulibeth Florez-Rivadeneira, Sussane Ardila, Gabriel Parra-Henao, Juan David Ramírez
BACKGROUND: Trypanosoma cruzi is the causative agent of Chagas disease. Due to its genetic diversity has been classified into six Discrete Typing Units (DTUs) in association with transmission cycles. In Colombia, natural T. cruzi infection has been detected in 15 triatomine species. There is scarce information regarding the infection rates, DTUs and feeding preferences of secondary vectors. Therefore, the aim of this study was to determine T. cruzi infection rates, parasite DTU, ecotopes, insect stages, geographical location and bug feeding preferences across six different triatomine species...
December 1, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27895277/triatoma-infestans-calreticulin-gene-cloning-and-expression-of-a-main-domain-that-interacts-with-the-host-complement-system
#12
Katherine Weinberger, Norberto Collazo, Juan Carlos Aguillón, María Carmen Molina, Carlos Rosas, Jaime Peña, Javier Pizarro, Ismael Maldonado, Pedro E Cattan, Werner Apt, Arturo Ferreira
Triatoma infestans is an important hematophagous vector of Chagas disease, a neglected chronic illness affecting approximately 6 million people in Latin America. Hematophagous insects possess several molecules in their saliva that counteract host defensive responses. Calreticulin (CRT), a multifunctional protein secreted in saliva, contributes to the feeding process in some insects. Human CRT (HuCRT) and Trypanosoma cruzi CRT (TcCRT) inhibit the classical pathway of complement activation, mainly by interacting through their central S domain with complement component C1...
November 28, 2016: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/27869382/-description-of-external-cuticular-setae-of-head-thorax-legs-abdomen-and-genitalia-of-four-triatominae-species
#13
Francys Avendaño-Rangel, Claudia Magaly Sandoval, Elis José Aldana
The classification of the cuticular extensions of insects has been proposed as a taxonomic tool; however, the internal and external processes of the cuticular extensions of the Triatominae subfamily have not been fully analyzed and categorized. Objective: To describe the setae from different regions of the outer cuticle of several triatomine species by scanning electron microscopy. Materials and methods: Triatomines were washed and dried, after which different regions of the body from Eratyrus mucronatus, Triatoma maculata, Panstrongylus geniculatus and Belminus ferroae specimens were dissected, mounted on graphite double-sided adhesive tape over metal supports, metalized with gold and micrographed for further analysis...
September 1, 2016: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/27862092/assessment-of-the-anti-feeding-and-insecticidal-effects-of-the-combination-of-dinotefuran-permethrin-and-pyriproxyfen-vectra-%C3%A2-3d-against-triatoma-infestans-on-rats
#14
D Tahir, B Davoust, M Varloud, J-M Berenger, D Raoult, L Almeras, P Parola
This study, based on the rat model, was designed to explore the anti-feeding and insecticidal efficacy of a topical ectoparasiticide, dinotefuran-permethrin-pyriproxyfen (DPP), against Triatoma infestans (Hemiptera: Reduviidae), a vector of Trypanosoma cruzi (Trypanosomatida: Trypanosomatidae), for which dogs are domestic reservoir hosts. Twenty rats were divided into two equal groups: untreated and treated. Each rat was exposed under sedation to 16 T. infestans of mixed life stages for 1 h on days 1, 7, 14, 21 and 28 post-treatment...
November 9, 2016: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/27860015/bias-due-to-methods-of-parasite-detection-when-estimating-prevalence-of-infection-of-triatoma-infestans-by-trypanosoma-cruzi
#15
Frédéric Lardeux, Claudia Aliaga, Stéphanie Depickère
The study aimed to quantify the bias from parasite detection methods in the estimation of the prevalence of infection of Triatoma infestans by Trypanosoma cruzi, the agent of Chagas disease. Three common protocols that detect T. cruzi in a sample of 640 wild-caught T. infestans were compared: (1) the microscopic observation of insect fecal droplets, (2) a PCR protocol targeting mini-exon genes of T. cruzi (MeM-PCR), and (3) a PCR protocol targeting a satellite repeated unit of the parasite. Agreement among protocols was computed using Krippendorff Kα...
December 2016: Journal of Vector Ecology: Journal of the Society for Vector Ecology
https://www.readbyqxmd.com/read/27832063/one-health-interactions-of-chagas-disease-vectors-canid-hosts-and-human-residents-along-the-texas-mexico-border
#16
Melissa N Garcia, Sarah O'Day, Susan Fisher-Hoch, Rodion Gorchakov, Ramiro Patino, Teresa P Feria Arroyo, Susan T Laing, Job E Lopez, Alexandra Ingber, Kathryn M Jones, Kristy O Murray
BACKGROUND: Chagas disease (Trypanosoma cruzi infection) is the leading cause of non-ischemic dilated cardiomyopathy in Latin America. Texas, particularly the southern region, has compounding factors that could contribute to T. cruzi transmission; however, epidemiologic studies are lacking. The aim of this study was to ascertain the prevalence of T. cruzi in three different mammalian species (coyotes, stray domestic dogs, and humans) and vectors (Triatoma species) to understand the burden of Chagas disease among sylvatic, peridomestic, and domestic cycles...
November 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27830050/the-presence-of-the-ancestral-insect-telomeric-motif-in-kissing-bugs-triatominae-rules-out-the-hypothesis-of-its-loss-in-evolutionarily-advanced-heteroptera-cimicomorpha
#17
Sebastián Pita, Francisco Panzera, Pablo Mora, Jesús Vela, Teresa Palomeque, Pedro Lorite
Next-generation sequencing data analysis on Triatoma infestans Klug, 1834 (Heteroptera, Cimicomorpha, Reduviidae) revealed the presence of the ancestral insect (TTAGG)n telomeric motif in its genome. Fluorescence in situ hybridization confirms that chromosomes bear this telomeric sequence in their chromosomal ends. Furthermore, motif amount estimation was about 0.03% of the total genome, so that the average telomere length in each chromosomal end is almost 18 kb long. We also detected the presence of (TTAGG)n telomeric repeat in mitotic and meiotic chromosomes in other three species of Triatominae: Triatoma dimidiata Latreille, 1811, Dipetalogaster maxima Uhler, 1894, and Rhodnius prolixus Ståhl, 1859...
2016: Comparative Cytogenetics
https://www.readbyqxmd.com/read/27828620/prevalence-of-american-trypanosomiasis-and-leishmaniases-in-domestic-dogs-in-a-rural-area-of-the-municipality-of-s%C3%A3-o-jo%C3%A3-o-do-piau%C3%A3-piau%C3%A3-state-brazil
#18
Taliha Dias Perez, Fabiano Borges Figueiredo, Artur Augusto Mendes Velho Junior, Valmir Laurentino Silva, Maria de Fátima Madeira, Reginaldo Peçanha Brazil, José Rodrigues Coura
Chagas disease and the leishmaniases are endemic zoonoses of great importance to public health in the state of Piauí, Brazil. The domestic dog (Canis familiaris) is a major reservoir, host of Trypanosoma cruzi and Leishmania spp. in both urban and rural areas, playing an important role in the transmission of these parasites. The present study evaluated the prevalence of both infectious diseases in dogs of a rural area in the municipality of São João do Piauí, Piauí State. One hundred twenty-nine blood samples were collected for serological assessment: for the leishmaniases, 49 (38%) animals tested positive by the Dual-Path Platform technology (DPP), nine (6%) by the Enzyme-linked Immunosorbent Assay (ELISA), and 19 (14...
November 3, 2016: Revista do Instituto de Medicina Tropical de São Paulo
https://www.readbyqxmd.com/read/27821685/mitochondrial-gene-confirms-the-specific-status-of-triatoma-pintodiasi-jurberg-cunha-and-rocha-2013-hemiptera-triatominae-an-endemic-species-in-brazil
#19
Kaio Cesar Chaboli Alevi, Ana Letícia Guerra, Carlos Henrique Lima Imperador, José Jurberg, Felipe Ferraz Figueiredo Moreira, Maria Tercília Vilela de Azeredo Oliveira
Chagas disease is most frequently transmitted to humans through contact with feces of insects from the Triatominae subfamily. In Brazil, there are 65 species of triatomines distributed throughout the country's 27 states. Among the species in the state of Rio Grande do Sul, Triatoma rubrovaria, Triatoma oliveirai, Triatoma pintodiasi, Triatoma klugi, Triatoma carcavalloi, and Triatoma circummaculata (with the addition Triatoma limai, which is endemic to Argentina) form the T. rubrovaria subcomplex. The last species described and grouped into this subcomplex was T...
November 7, 2016: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/27809930/sleeping-habits-affect-access-to-host-by-chagas-disease-vector-triatoma-dimidiata
#20
Etienne Waleckx, Rafael Pasos-Alquicira, María Jesús Ramírez-Sierra, Eric Dumonteil
BACKGROUND: Chagas disease, caused by the parasite Trypanosoma cruzi, is mainly transmitted by blood-sucking bugs called triatomines. In the Yucatán Peninsula, Mexico, the main vector of T. cruzi is Triatoma dimidiata. While this species may colonize houses in other regions, it is mostly intrusive in Yucatán: it generally lives in sylvan and peridomestic areas, and frequently enters inside homes, likely attracted by potential vertebrate hosts, without establishing colonies. Bugs collected inside homes have a low nutritional status, suggesting that they cannot efficiently feed inside these houses...
November 3, 2016: Parasites & Vectors
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