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https://www.readbyqxmd.com/read/28413725/trypanosoma-cruzi-reservoir-triatomine-vector-co-occurrence-networks-reveal-meta-community-effects-by-synanthropic-mammals-on-geographic-dispersal
#1
Carlos N Ibarra-Cerdeña, Leopoldo Valiente-Banuet, Víctor Sánchez-Cordero, Christopher R Stephens, Janine M Ramsey
Contemporary patterns of land use and global climate change are modifying regional pools of parasite host species. The impact of host community changes on human disease risk, however, is difficult to assess due to a lack of information about zoonotic parasite host assemblages. We have used a recently developed method to infer parasite-host interactions for Chagas Disease (CD) from vector-host co-occurrence networks. Vector-host networks were constructed to analyze topological characteristics of the network and ecological traits of species' nodes, which could provide information regarding parasite regional dispersal in Mexico...
2017: PeerJ
https://www.readbyqxmd.com/read/28407782/triatoma-vitticeps-subcomplex-hemiptera-reduviidae-triatominae-a-new-grouping-of-chagas-disease-vectors-from-south-america
#2
Kaio Cesar Chaboli Alevi, Jader de Oliveira, Maria Tercília Vilela de Azeredo-Oliveira, João Aristeu da Rosa
BACKGROUND: Triatomines have been grouped into complexes and subcomplexes based largely on morphological and geographical distribution. Although these groupings are not formally recognised as taxonomic ranks, they are likely monophyletic. However, recent studies have demonstrated that some subcomplexes from South America did not form monophyletic groups, and reorganisations have been suggested. One suggested reorganisation is to exclude Triatoma vitticeps, T. melanocephala, and T. tibiamaculata from the T...
April 13, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28399279/the-botanical-monoterpenes-linalool-and-eugenol-flush-out-nymphs-of-triatoma-infestans-hemiptera-reduviidae
#3
A N Moretti, E A Seccacini, E N Zerba, D Canale, R A Alzogaray
Monoterpenes are the main components of essential oils. Some members of this chemical family present insecticidal activity. Triatoma infestans (Klug) is the main vector of Chagas disease in Argentina, Bolivia, Paraguay, and Perú. The objective of this work was to evaluate the effect of six monoterpenes (1,8-cineole, eugenol, linalool, menthol, α-terpineol, and thymol) on the locomotor and flushing out activity of T. infestans. A video tracking technique was used to evaluate the locomotor activity of nymphs exposed to different concentrations of these chemicals applied as films on filter paper...
March 29, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28399226/biology-of-triatoma-sherlocki-hemiptera-reduviidae-under-laboratory-conditions-biological-cycle-and-resistance-to-starvation
#4
Vanessa Lima-Neiva, Teresa C M Gonçalves, Leonardo S Bastos, Marcia Gumiel, Nathália C Correia, Catia C Silva, Carlos E Almeida, Jane Costa
Triatoma sherlocki Papa, Jurberg, Carcavallo, Cerqueira & Barata was described in 2002, based on specimens caught in the wild in the municipality of Gentio do Ouro, Bahia, Brazil. In 2009, nymphs and adults were detected inside homes and sylvatic specimens were positive for Trypanosoma cruzi (Chagas). No information on the bionomics of T. sherlocki exists, although such data are considered essential to estimate its vector and colonization potential in domestic environments. Herein, the biological cycle of T...
March 30, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28399199/house-reinfestation-with-triatoma-infestans-hemiptera-reduviidae-after-community-wide-spraying-with-insecticides-in-the-argentine-chaco-a-multifactorial-process
#5
Yael M Provecho, M Sol Gaspe, M Del Pilar Fernández, Ricardo E Gürtler
We investigated the dynamics and underlying causes of house (re)infestation with Triatoma infestans (Klug 1834) after a community-wide residual spraying with pyrethroids in a well-defined rural section of Pampa del Indio municipality (northeastern Argentina) over a 4-yr period. House infestation was assessed by timed manual searches, during insecticide applications, and by opportunistic householders' bug collections. All reinfested houses were selectively re-sprayed with insecticides. The resident population comprised Qom (66...
February 19, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28366189/ictv-virus-taxonomy-profile-dicistroviridae
#6
S M Valles, Y Chen, A E Firth, D M A Guérin, Y Hashimoto, S Herrero, J R de Miranda, E Ryabov, Ictv Report Consortium
Dicistroviridae is a family of small non-enveloped viruses with monopartite, linear, positive-sense RNA genomes of approximately 8-10 kb. Viruses of all classified species infect arthropod hosts, with some having devastating economic consequences, such as acute bee paralysis virus in domesticated honeybees and taura syndrome virus in shrimp farming. Conversely, the host specificity and other desirable traits exhibited by several members of this group make them potential natural enemies for intentional use against arthropod pests, such as triatoma virus against triatomine bugs that vector Chagas disease...
March 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28327800/trypanosoma-cruzi-i-genotype-among-isolates-from-patients-with-chronic-chagas-disease-followed-at-the-evandro-chagas-national-institute-of-infectious-diseases-fiocruz-brazil
#7
Tatiana da Silva Fonseca de Oliveira, Barbara Neves Dos Santos, Tainah Silva Galdino, Alejandro Marcel Hasslocher-Moreno, Otilio Machado Pereira Bastos, Maria Auxiliadora de Sousa
INTRODUCTION: Trypanosoma cruzi is the etiologic agent of Chagas disease in humans, mainly in Latin America. Trypanosome stocks were isolated by hemoculture from patients followed at Evandro Chagas National Institute of Infectious Diseases (FIOCRUZ) and studied using different approaches. METHODS: For species and genotype identification, the stocks were analyzed by parasitological techniques, polymerase chain reaction assays targeted to specific DNA sequences, isoenzyme patterns, besides sequencing of a polymorphic locus of TcSC5D gene (one stock)...
January 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28260529/implementing-a-vector-surveillance-response-system-for-chagas-disease-control-a-4-year-field-trial-in-nicaragua
#8
Kota Yoshioka, Doribel Tercero, Byron Pérez, Jiro Nakamura, Lenin Pérez
BACKGROUND: Chagas disease is one of the neglected tropical diseases (NTDs). International goals for its control involve elimination of vector-borne transmission. Central American countries face challenges in establishing sustainable vector control programmes, since the main vector, Triatoma dimidiata, cannot be eliminated. In 2012, the Ministry of Health in Nicaragua started a field test of a vector surveillance-response system to control domestic vector infestation. This paper reports the main findings from this pilot study...
March 6, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28219669/combined-phylogenetic-and-morphometric-information-to-delimit-and-unify-the-triatoma-brasiliensis-species-complex-and-the-brasiliensis-subcomplex
#9
Jader Oliveira, Paula L Marcet, Daniela M Takiya, Vagner J Mendonça, Tiago Belintani, Maria D Bargues, Lucia Mateo, Vivian Chagas, Elaine Folly-Ramos, Pedro Cordeiro-Estrela, Rodrigo Gurgel-Gonçalves, Jane Costa, João A da Rosa, Carlos E Almeida
"Triatoma brasiliensis species complex" was defined as a monophyletic group of the species: T. brasiliensis, T. juazeirensis, T. melanica, and T. sherlocki. An alternative grouping scheme proposed the concept of "Brasiliensis subcomplex" which included the former species together with T. melanocephala, T. petrocchiae, T. lenti, T. tibiamaculata, and T. vitticeps. To evaluate the relationship among these taxa we combined the results obtained with four mitochondrial genes (12S, 16S, COI and Cytb, adding to 1811bp) and geometric morphometric analysis of wings and heads...
February 20, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28199333/comparative-and-functional-triatomine-genomics-reveals-reductions-and-expansions-in-insecticide-resistance-related-gene-families
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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...
February 2017: Genetica
https://www.readbyqxmd.com/read/28117911/sperm-dimorphism-in-the-triatoma-brasiliensis-species-complex-and-its-applications
#18
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
#19
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
#20
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
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