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https://www.readbyqxmd.com/read/29340461/synanthropic-triatomines-as-potential-vectors-of-trypanosoma-cruzi-in-central-brazil
#1
Thaís Tâmara Castro Minuzzi-Souza, Nadjar Nitz, César Augusto Cuba Cuba, Marcelo Santalucia, Monique Knox, Luciana Hagström, Camilla Bernardes Furtado, Tamires Emanuele Vital, Marcos Takashi Obara, Mariana Machado Hecht, Rodrigo Gurgel-Gonçalves
INTRODUCTION: Chagas disease surveillance requires current knowledge on synanthropic triatomines. We analyzed the occurrence and Trypanosoma cruzi infection rates of triatomine bugs in central Brazil, during 2012-2014. METHODS: Triatomines were collected inside or around houses, and T. cruzi infection was determined by optical microscopy and conventional/quantitative polymerase chain reaction. RESULTS: Of the 2706 triatomines collected, Triatoma sordida was the most frequent species in Goiás State, whereas Panstrongylus megistus predominated in the Federal District...
November 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/29304849/should-i-stay-or-should-i-go-movement-of-adult-triatoma-sordida-within-the-peridomestic-area-of-a-typical-brazilian-cerrado-rural-household
#2
Edson Santos Dantas, Rodrigo Gurgel-Gonçalves, Daniel Antunes Maciel Villela, Fernando Araújo Monteiro, Rafael Maciel-de-Freitas
BACKGROUND: Chagas disease, or American trypanosomiasis, is an important neglected tropical illness caused by the flagellate protozoan Trypanosoma cruzi, which is primarily transmitted to humans by hematophagous insects of the subfamily Triatominae. Although knowledge on triatomine movement capabilities at the micro-geographical scale is of fundamental importance concerning the development of effective vector control strategies, it remains a poorly understood subject. Furthermore, survival rates and size estimates of natural populations are important topics to consider when evaluating transmission intensity...
January 5, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29288089/exploring-the-molecular-complexity-of-triatoma-dimidiata-sialome
#3
Paula Beatriz Santiago, Carla Nunes de Araújo, Sébastien Charneau, Izabela Marques Dourado Bastos, Teresa Cristina F Assumpção, Rayner Myr Lauterjung Queiroz, Yanna Reis Praça, Thuany de Moura Cordeiro, Carlos Henrique Saraiva Garcia, Ionizete Garcia da Silva, Tainá Raiol, Flávia Nader Motta, João Victor de Araújo Oliveira, Marcelo Valle de Sousa, José Marcos C Ribeiro, Jaime Martins de Santana
Triatoma dimidiata, a Chagas disease vector widely distributed along Central America, has great capability for domestic adaptation as the majority of specimens caught inside human dwellings or in peridomestic areas fed human blood. Exploring the salivary compounds that overcome host haemostatic and immune responses is of great scientific interest. Here, we provide a deeper insight into its salivary gland molecules. We used high-throughput RNA sequencing to examine in depth the T. dimidiata salivary gland transcriptome...
December 26, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/29260653/hybrid-collapse-confirms-the-specific-status-of-triatoma-bahiensis-sherlock-and-serafim-1967-hemiptera-triatominae-an-endemic-species-in-brazil
#4
Kaio Cesar Chaboli Alevi, Heloisa Pinotti, Renato Freitas de Araújo, Maria Tercília Vilela de Azeredo Oliveira, João Aristeu da Rosa, Vagner José Mendonça
Six to seven million people worldwide are estimated to be infected with Trypanosoma cruzi, the etiologic agent of Chagas disease transmitted mainly by triatomines. Triatoma bahiensis was recently collected in the Brazilian state of Bahia and revalidated using different approaches. The main criterion used to define a "good" biological species is reproductive isolation, so we evaluated the cytogenetics of first-generation (F1) hybrids resulting from the experimental cross between T. bahiensis females and Triatoma lenti males to possibly characterize the postzygotic isolation associated with the hybrid breakdown...
December 18, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29260645/clock-gene-period-in-the-chagas-disease-vector-triatoma-infestans-hemiptera-reduviidae
#5
María M Stroppa, Ignacio Gimenez, Beatriz A García
To contribute to a better understanding of the molecular bases of the circadian biological rhythms in Chagas disease vectors, in this work we identified functional domains in the sequences of the clock protein PERIOD (PER) in Rhodnius prolixus and Triatoma infestans and analyzed the expression of the PER gene at mRNA level in T. infestans. The PER protein sequences comparison among these species and those from other insects revealed that the most similar regions are the PAS domains and the most variable is the COOH-terminal...
December 18, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29248626/vectors-of-diversity-genome-wide-diversity-across-the-geographic-range-of-the-chagas-disease-vector-triatoma-dimidiata-sensu-lato-hemiptera-reduviidae
#6
Silvia A Justi, Sara Cahan, Lori Stevens, Carlota Monroy, Raquel Lima, Patricia L Dorn
To date, the phylogeny of Triatoma dimidiata sensu lato (s. l.) (Hemiptera: Reduviidae: Triatominae), the epidemiologically most important Chagas disease vector in Central America and a secondary vector in Mexico and northern South America, has only been investigated by one multi-copy nuclear gene (Internal Transcribed Spacer - 2) and a few mitochondrial genes. We examined 450 specimens sampled across most of its native range from Mexico to Ecuador using reduced representation next-generation sequencing encompassing over 16,000 single nucleotide polymorphisms (SNPs)...
December 14, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/29232402/chagas-disease-vector-blood-meal-sources-identified-by-protein-mass-spectrometry
#7
Judith I Keller, Bryan A Ballif, Riley M St Clair, James J Vincent, M Carlota Monroy, Lori Stevens
Chagas disease is a complex vector borne parasitic disease involving blood feeding Triatominae (Hemiptera: Reduviidae) insects, also known as kissing bugs, and the vertebrates they feed on. This disease has tremendous impacts on millions of people and is a global health problem. The etiological agent of Chagas disease, Trypanosoma cruzi (Kinetoplastea: Trypanosomatida: Trypanosomatidae), is deposited on the mammalian host in the insect's feces during a blood meal, and enters the host's blood stream through mucous membranes or a break in the skin...
2017: PloS One
https://www.readbyqxmd.com/read/29211791/body-size-and-hosts-of-triatoma-infestans-populations-affect-the-size-of-bloodmeal-contents-and-female-fecundity-in-rural-northwestern-argentina
#8
Ricardo E Gürtler, María Del Pilar Fernández, María Carla Cecere, Joel E Cohen
Human sleeping quarters (domiciles) and chicken coops are key source habitats of Triatoma infestans-the principal vector of the infection that causes Chagas disease-in rural communities in northern Argentina. Here we investigated the links among individual bug bloodmeal contents (BMC, mg), female fecundity, body length (L, mm), host blood sources and habitats. We tested whether L, habitat and host blood conferred relative fitness advantages using generalized linear mixed-effects models and a multimodel inference approach with model averaging...
December 6, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29211106/trypanosoma-cruzi-strain-tciv-infects-raccoons-from-illinois
#9
Cailey Vandermark, Elliott Zieman, Esmarie Boyles, Clayton K Nielsen, Cheryl Davis, Francisco Agustín Jiménez
BACKGROUND: The northern limits of Trypanosoma cruzi across the territory of the United States remain unknown. The known vectors Triatoma sanguisuga and T. lecticularia find their northernmost limits in Illinois; yet, earlier screenings of those insects did not reveal the presence of the pathogen, which has not been reported in vectors or reservoir hosts in this state. OBJECTIVES: Five species of medium-sized mammals were screened for the presence of T. cruzi. METHODS: Genomic DNA was isolated from heart, spleen and skeletal muscle of bobcats (Lynx rufus, n = 60), raccoons (Procyon lotor, n = 37), nine-banded armadillos (Dasypus novemcinctus, n = 5), Virginia opossums (Didelphis virginiana, n = 3), and a red fox (Vulpes vulpes)...
January 2018: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/29211105/assessing-the-risk-zones-of-chagas-disease-in-chile-in-a-world-marked-by-global-climatic-change
#10
Valentina Tapia-Garay, Daniela P Figueroa, Ana Maldonado, Daniel Frías-Laserre, Christian R Gonzalez, Alonso Parra, Lucia Canals, Werner Apt, Sergio Alvarado, Dante Cáceres, Mauricio Canals
BACKGROUND: Vector transmission of Trypanosoma cruzi appears to be interrupted in Chile; however, data show increasing incidence of Chagas' disease, raising concerns that there may be a reemerging problem. OBJECTIVE: To estimate the actual risk in a changing world it is necessary to consider the historical vector distribution and correlate this distribution with the presence of cases and climate change. METHODS: Potential distribution models of Triatoma infestans and Chagas disease were performed using Maxent, a machine-learning method...
January 2018: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/29190728/chagas-disease-vector-control-and-taylor-s-law
#11
Joel E Cohen, Lucía I Rodríguez-Planes, María S Gaspe, María C Cecere, Marta V Cardinal, Ricardo E Gürtler
BACKGROUND: Large spatial and temporal fluctuations in the population density of living organisms have profound consequences for biodiversity conservation, food production, pest control and disease control, especially vector-borne disease control. Chagas disease vector control based on insecticide spraying could benefit from improved concepts and methods to deal with spatial variations in vector population density. METHODOLOGY/PRINCIPAL FINDINGS: We show that Taylor's law (TL) of fluctuation scaling describes accurately the mean and variance over space of relative abundance, by habitat, of four insect vectors of Chagas disease (Triatoma infestans, Triatoma guasayana, Triatoma garciabesi and Triatoma sordida) in 33,908 searches of people's dwellings and associated habitats in 79 field surveys in four districts in the Argentine Chaco region, before and after insecticide spraying...
November 30, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29176770/high-trypanosoma-spp-diversity-is-maintained-by-bats-and-triatomines-in-esp%C3%A3-rito-santo-state-brazil
#12
Maria Augusta Dario, Cristiane Varella Lisboa, Luciana M Costa, Ricardo Moratelli, Monique Pereira Nascimento, Leonora Pires Costa, Yuri Luiz Reis Leite, Martin S Llewellyn, Samanta Cristina das Chagas Xavier, André Luiz Rodrigues Roque, Ana Maria Jansen
The aim of this study was to reevaluate the ecology of an area in the Atlantic Forest, southeast Brazil, where Chagas disease (CD) has been found to occur. In a previous study, immediately after the occurrence of a CD case, we did not observe any sylvatic small mammals or dogs with Trypanosoma cruzi cruzi infections, but Triatoma vitticeps presented high T. c. cruzi infection rates. In this study, we investigated bats together with non-volant mammals, dogs, and triatomines to explore other possible T. c. cruzi reservoirs/hosts in the area...
2017: PloS One
https://www.readbyqxmd.com/read/29161488/identifying-trypanosoma-cruzi-discreet-typing-units-in-triatomines-collected-in-different-natural-regions-of-per%C3%A3%C2%BA
#13
Carlos P Padilla, Uriel Alvarado, Gladis Ventura, Deysi Luna-Caipo, Marcial Suárez, José R Tuñoque, Nancy Ruelas-Llerena, Luis A Fachín, Alina Huiza, Lizandro Gonzáles, Julio César Carranza, Gustavo Adolfo Vallejo, Gustavo Adolfo Vallejo, Abraham G Cáceres, Abraham G Cáceres
INTRODUCTION: Trypanosoma cruzi has been divided by international consensus into six discrete typing units (DTU): TcI, TcII, TcIII, TcIV, TcV y TcVI. The factors determining the dynamics of T. cruzi genotypes vector transmission of Chagas' disease in the different geographical regions of Perú are still unknown. OBJECTIVE: To detect and type T. cruzi DTUs from the faeces of seven species of triatomines (Panstrongylus chinai, P. geniculatus, P. herreri, Rhodnius robustus, R...
March 29, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/29161483/-spatio-temporal-analysis-of-the-biophysical-and-ecological-conditions-of-triatoma-dimidiata-hemiptera-reduviidae-triatominae-in-the-northeast-region-of-colombia
#14
Jaime Badel-Mogollón, Laura Rodríguez-Figueroa, Gabriel Parra-Henao
INTRODUCTION: Due to the lack of information regarding biophysical and spatio-temporal conditions (hydrometheorologic and vegetal coverage density) in areas with Triatoma dimidiata in the Colombian departments of Santander and Boyacá, there is a need to elucidate the association patterns of these variables to determine the distribution and control of this species. OBJECTIVE: To make a spatio-temporal analysis of biophysical variables related to the distribution of T...
March 29, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/29161480/-biological-parameters-of-meccus-phyllosomus-phyllosomus-burmeister-1835-triatoma-recurva-st%C3%A3-l-1868-hemiptera-reduviidae-and-their-laboratory-hybrids
#15
Lizbeth Díaz, Karen Covarrubias, Ángel Licón, Mixtli Astorga, Yaneth Moreno, José Alejandro Martínez
INTRODUCTION: Hybrids from species and subspecies of Mexican triatomines have shown outstanding biological and behavioral characteristics as compared with their parental groups. This could lead to an increasing risk of transmission of Trypanosoma cruzi to human and animal reservoir hosts. OBJECTIVE: To describe and compare biological parameters related to the life cycle of Triatoma recurva, Meccus phyllosomus phyllosomus and their laboratory hybrids and estimate their risk as transmitters of T...
March 29, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/29160509/sympatry-influence-in-the-interaction-of-trypanosoma-cruzi-with-triatomine
#16
Elaine Schultz Dworak, Silvana Marques de Araújo, Mônica Lúcia Gomes, Miyoko Massago, Érika Cristina Ferreira, Max Jean de Ornelas Toledo
INTRODUCTION: Trypanosoma cruzi, the etiologic agent of Chagas disease, is widely distributed in nature, circulating between triatomine bugs and sylvatic mammals, and has large genetic diversity. Both the vector species and the genetic lineages of T. cruzi present a varied geographical distribution. This study aimed to verify the influence of sympatry in the interaction of T. cruzi with triatomines. Methods: The behavior of the strains PR2256 (T. cruzi II) and AM14 (T. cruzi IV) was studied in Triatoma sordida (TS) and Rhodnius robustus (RR)...
September 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/29154947/16s-rrna-gene-amplicon-sequencing-reveals-dominance-of-actinobacteria-in-rhodnius-pallescens-compared-to-triatoma-maculata-midgut-microbiota-in-natural-populations-of-vector-insects-from-colombia
#17
Luisa M Montoya-Porras, Triana-Chavez Omar, F Alzate Juan, X Claudia Moreno Herrera, Gloria E Cadavid-Restrepo
Chagas disease affects more than 6 million people in Latin America, it is a parasitic disease caused by the protozoan Trypanosoma cruzi, which is transmitted mainly by bloodsucking insects of the Triatominae subfamily. Studies on microbial communities that inhabit the insect gut are important to understanding their role in the parasite transmission and development. The present work aims to evaluate the gut bacterial composition of natural populations of triatomine species from Vichada and Magdalena, administrative states called departments in Colombia, using high-throughput sequencing technologies...
November 15, 2017: Acta Tropica
https://www.readbyqxmd.com/read/29146550/temporal-variations-of-fluctuating-asymmetry-in-wing-size-and-shape-of-triatoma-infestans-populations-from-northwest-argentina
#18
Julieta Nattero, María Carla Cecere, Ricardo E Gürtler
Environmentally-induced developmental instability has frequently been assessed using fluctuating asymmetry (FA) methods. For Triatoma infestans, the major vector of Chagas disease, the combined effects of host-feeding sources and habitats affected wing developmental instability depending on sex in Figueroa villages, northwest Argentina. Here we investigated whether habitat, sex, season/year and insecticide applications affected wing developmental instability in T. infestans populations from Amamá and other rural villages of northwest Argentina over a four-year period...
November 13, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/29143212/rhodococcus-psychrotolerans-sp-nov-isolated-from-rhizosphere-of-deschampsia-antarctica
#19
Leonardo Jose Silva, Danilo Tosta Souza, Diego Bonaldo Genuario, Harold Alexander Vargas Hoyos, Suikinai Nobre Santos, Luiz Henrique Rosa, Tiago Domingues Zucchi, Itamar Soares Melo
A novel actinobacterium, designated strain CMAA 1533(T), was isolated from the rhizosphere of Deschampsia antarctica collected at King George Island, Antarctic Peninsula. Strain CMAA 1533(T) was found to grow over a wide range of temperatures (4-28 °C) and pH (4-10). Macroscopically, the colonies were observed to be circular shaped, smooth, brittle and opaque-cream on most of the culture media tested. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain CMAA 1533(T) belongs to the family Nocardiaceae and forms a distinct phyletic line within the genus Rhodococcus...
November 15, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/29141765/bionomics-and-spatial-distribution-of-triatomine-vectors-of-trypanosoma-cruzi-in-texas-and-other-southern-states-usa
#20
Rachel Curtis-Robles, Sarah A Hamer, Sage Lane, Michael Z Levy, Gabriel L Hamer
Defining spatial and temporal occurrences of triatomine vectors of Trypanosoma cruzi, the agent of Chagas disease, in the US is critical for public health protection. Through a citizen science program and field collections from 2012 to 2016, we collected 3,215 triatomines, mainly from Texas. Using morphological and molecular approaches, we identified seven Triatoma species and report sex, length, and blood engorgement status. Many citizen-collected triatomines (92.9%) were encountered indoors, in peridomestic settings, or in dog kennels and represent spillover transmission risk of T...
November 6, 2017: American Journal of Tropical Medicine and Hygiene
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