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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
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
https://www.readbyqxmd.com/read/27792774/under-expression-of-chemosensory-genes-in-domiciliary-bugs-of-the-chagas-disease-vector-triatoma-brasiliensis
#11
Axelle Marchant, Florence Mougel, Emmanuelle Jacquin-Joly, Jane Costa, Carlos Eduardo Almeida, Myriam Harry
BACKGROUND: In Latin America, the bloodsucking bugs Triatominae are vectors of Trypanosoma cruzi, the parasite that causes Chagas disease. Chemical elimination programs have been launched to control Chagas disease vectors. However, the disease persists because native vectors from sylvatic habitats are able to (re)colonize houses-a process called domiciliation. Triatoma brasiliensis is one example. Because the chemosensory system allows insects to interact with their environment and plays a key role in insect adaption, we conducted a descriptive and comparative study of the chemosensory transcriptome of T...
October 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27770761/pre-exposure-to-faeces-or-saliva-of-triatoma-dimidiata-decreases-parasitemia-in-mice-challenged-with-trypanosoma-cruzi-a-description-of-the-inflammatory-reaction-at-the-inoculation-site
#12
Victor Monteon, Enrique Quen-Rámirez, Veronica Macedo-Reyes, Ruth Lopez, Karla Acosta-Viana, Pamela Pennigton, Angel Ramos-Ligonio
Under natural conditions, Trypanosoma cruzi infection is transmitted to mammals when faeces contaminated with metacyclic trypomastigotes gain access through skin lesions, mucosa or bite wounds. Natural infection of bugs with T. cruzi can vary greatly from less than 1% up to 70%, depending on triatomine species: in the case of Triatoma dimidiata, the percentage of infection is around 30%. In this work uses biological fluids (saliva and faeces) from Triatoma dimidiata to inoculate experimental animals once or multiple times, before inoculation with faeces contaminated with metacyclic trypomastigotes discrete type unit Ia (TcI)...
October 1, 2016: Annals of Parasitology
https://www.readbyqxmd.com/read/27759767/triatoma-maculata-colonises-urban-domicilies-in-boa-vista-roraima-brazil
#13
Alice Ricardo-Silva, Teresa Cristina Monte Gonçalves, José Francisco Luitgards-Moura, Catarina Macedo Lopes, Silvano Pedrosa da Silva, Amanda Queiroz Bastos, Nathalia Coelho Vargas, Maria-Rosa Goreti Freitas
During a medical entomology course in Boa Vista, Roraima, colonies of Triatoma maculata closely associated with pigeon nests were observed in concrete air-conditioner box located on the external plastered and cemented walls of a modern brick-built apartment block. In only one eight-hole ceramic brick, located inside one air-conditioner box, 127 specimens of T. maculata were collected. T. maculata is a recognised vector of Trypanosoma cruzi in the surrounding area and its domiciliation increases the risk of Chagas disease transmission...
November 2016: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/27758973/evolution-of-chagas-disease-in-brazil-epidemiological-perspective-and-challenges-for-the-future-a-critical-review
#14
Rafael Bello Corassa, Carmen Aceijas, Paula Aryane Brito Alves, Hemda Garelick
AIMS: This article aimed to provide a critical review of the evolution of Chagas' disease (ChD) in Brazil, its magnitude, historical development and management, and challenges for the future. METHODS: A literature search was performed using PubMed, SciELO and Google Scholar and throughout collected articles' references. Narrative analysis was structured around five main themes identified: vector transmission, control programme, transfusion, oral and congenital transmission...
October 10, 2016: Perspectives in Public Health
https://www.readbyqxmd.com/read/27753118/relationships-between-altitude-triatomine-triatoma-dimidiata-immune-response-and-virulence-of-trypanosoma-cruzi-the-causal-agent-of-chagas-disease
#15
J A DE Fuentes-Vicente, M Cabrera-Bravo, J N Enríquez-Vara, M I Bucio-Torres, A E Gutiérrez-Cabrera, D G Vidal-López, J A Martínez-Ibarra, P M Salazar-Schettino, A Córdoba-Aguilar
Little is known about how the virulence of a human pathogen varies in the environment it shares with its vector. This study focused on whether the virulence of Trypanosoma cruzi (Trypanosomatida: Trypanosomatidae), the causal agent of Chagas' disease, is related to altitude. Accordingly, Triatoma dimidiata (Hemiptera: Reduviidae) specimens were collected at three different altitudes (300, 700 and 1400 m a.s.l.) in Chiapas, Mexico. The parasite was then isolated to infect uninfected T. dimidiata from the same altitudes, as well as female CD-1 mice...
October 18, 2016: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/27706620/new-chromosomal-evidence-for-the-origin-of-triatoma-infestans-populations-from-brazil
#16
N P Pereira, K C C Alevi, J A Rosa, M T V Azeredo-Oliveira
In this study, the karyometry of different Triatoma infestans populations from different states of Brazil was analyzed and compared with those of a population from Cochabamba. No significant differences were found between the population from Cochabamba and those from Brazil. These results are consistent with the origin of the T. infestans populations of Brazil by a founder effect from Cochabamba. Moreover, these findings also confirm that a founder effect occurred during the dispersal of T. infestans populations in different Brazilian states...
August 26, 2016: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/27706376/on-triatomines-cockroaches-and-haemolymphagy-under-laboratory-conditions-new-discoveries
#17
Pamela Durán, Edda Siñani, Stéphanie Depickère
For a long time, haematophagy was considered an obligate condition for triatomines (Hemiptera: Reduviidae) to complete their life cycle. Today, the ability to use haemolymphagy is suggested to represent an important survival strategy for some species, especially those in genus Belminus. As Eratyrus mucronatus and Triatoma boliviana are found with cockroaches in the Blaberinae subfamily in Bolivia, their developmental cycle from egg to adult under a "cockroach diet" was studied. The results suggested that having only cockroach haemolymph as a food source compromised development cycle completion in both species...
October 2016: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/27677531/demographic-effects-of-deltamethrin-resistance-in-the-chagas-disease-vector-triatoma-infestans
#18
M D Germano, M I Picollo
Triatoma infestans (Heteroptera: Reduviidae) Klug is the main vector of Chagas disease in Latin America. Resistance to deltamethrin was reported in Argentina and recently associated with reproductive and longevity trade-offs. The objectives of the present study were to describe the demographic consequences of deltamethrin resistance in T. infestans and to establish possible target stages for chemical control in susceptible and resistant colonies. A stage-classified matrix model was constructed based on the average stage length for susceptible, resistant and reciprocal matings' progeny...
September 28, 2016: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/27601526/a-case-of-cardboard-boxes-likely-facilitating-the-biting-of-a-patient-by-trypanosoma-cruzi-infected-triatomine-bugs
#19
Eduardo P Dolhun, Andrew W Antes
Chagas disease is a vector-borne and potentially fatal parasitic disease that is transmitted by the triatomine bug, a nocturnal feeding, flying arthropod, often referred to by its colloquial name, the "kissing bug." Vector-borne transmission is considered the most important means of spreading Chagas disease in endemic and nonendemic areas. Corrugated cardboard boxes may accelerate the spread of these insect vectors to nonendemic areas through their ability to harbor and transport small terrestrial arthropods such as silverfish, termites, and cockroaches...
September 6, 2016: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/27598640/occurrence-and-distribution-of-triatomines-hemiptera-reduviidae-in-municipalities-of-the-northeastern-region-of-minas-gerais-state-brazil
#20
João Victor Leite Dias, Eduardo Geraldo Fernandes, Herton Helder Rocha Pires, João Carlos Pinto Dias
INTRODUCTION: Triatomines are targeted for the control of Chagas disease in endemic areas of Brazil. METHODS: Data regarding triatomines captured during 2001-2008 in 34 municipalities in the Northeast of Minas Gerais were analyzed. RESULTS: In total, 11,187 triatomines from eight species were captured, mostly in henhouses and bedrooms. Trypanosomes were found in 203 samples. Main species were Triatoma sordida, Panstrongylus megistus, and Triatoma vitticeps...
July 2016: Revista da Sociedade Brasileira de Medicina Tropical
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