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Aedes aegypti

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https://www.readbyqxmd.com/read/29457957/synergistic-effect-of-entomopathogenic-fungus-fusarium-oxysporum-extract-in-combination-with-temephos-against-three-major-mosquito-vectors
#1
Perumal Vivekanandhan, Sengodan Karthi, Muthugounder S Shivakumar, Giovanni Benelli
Mosquito control using chemical insecticides is facing a major challenge due to development of insecticide resistance. Improving the efficiency of existing insecticides using synergistic secondary metabolites of biological origin is increasingly being researched. Herein, we evaluated the toxicity of Fusarium oxysporum extract alone and in binary combinations with temephos, on larvae and pupae of Anopheles stephensi, Aedes aegypti and Culex quinquefaciatus. F. oxysporum extract was characterized using TLC, FT-IR and GC-MS...
February 19, 2018: Pathogens and Global Health
https://www.readbyqxmd.com/read/29451659/environmental-factors-can-influence-dengue-reported-cases
#2
Marco Antonio F Carneiro, Beatriz da C A Alves, Flávia de Sousa Gehrke, José Nuno Domingues, Nelson Sá, Susana Paixão, João Figueiredo, Ana Ferreira, Cleonice Almeida, Amaury Machi, Eriane Savóia, Vânia Nascimento, Fernando Fonseca
INTRODUCTION: Global climate changes directly affect the natural environment and contribute to an increase in the transmission of diseases by vectors. Among these diseases, dengue is at the top of the list. The aim of our study was to understand the consequences of temporal variability of air temperature in the occurrence of dengue in an area comprising seven municipalities of the Greater São Paulo. METHOD: Characterization of a temporal trend of the disease in the region between 2010 and 2013 was performed through analysis of the notified number of dengue cases over this period...
November 2017: Revista da Associação Médica Brasileira
https://www.readbyqxmd.com/read/29451615/entomological-and-epidemiological-aspects-of-dengue-epidemics-in-fortaleza-cear%C3%A3-brazil-2001-2012
#3
Rhaquel de Morais Alves Barbosa Oliveira, Fernanda Montenegro de Carvalho Araújo, Luciano Pamplona de Góes Cavalcanti
OBJECTIVE: to characterize the entomological and epidemiological aspects of dengue epidemics occurred in Fortaleza, Ceará, Brazil, from 2001 to 2012. METHODS: descriptive study with data from the Information System for Notifiable Diseases (Sinan), Information System of Hospitalizations due to Yellow Fever and Dengue (2001-2009), National Program for Dengue Control (2010-2012), and Rapid Survey of Aedes aegypti Infestation Index, referring to the years in which the incidence of dengue was above 75%...
2018: Epidemiologia e Servicos de Saude: Revista do Sistema Unico de Saude do Brasil
https://www.readbyqxmd.com/read/29447357/analysis-of-cluster-randomized-test-negative-designs-cluster-level-methods
#4
Nicholas P Jewell, Suzanne Dufault, Zoe Cutcher, Cameron P Simmons, Katherine L Anders
Intervention trials of vector control methods often require community level randomization with appropriate inferential methods. For many interventions, the possibility of confounding due to the effects of health-care seeking behavior on disease ascertainment remains a concern. The test-negative design, a variant of the case-control method, was introduced to mitigate this issue in the assessment of the efficacy of influenza vaccination (measured at an individual level) on influenza infection. Here, we introduce a cluster-randomized test-negative design that includes randomization of the intervention at a group level...
February 12, 2018: Biostatistics
https://www.readbyqxmd.com/read/29447265/dynamic-remodeling-of-lipids-coincides-with-dengue-virus-replication-in-the-midgut-of-aedes-aegypti-mosquitoes
#5
Nunya Chotiwan, Barbara G Andre, Irma Sanchez-Vargas, M Nurul Islam, Jeffrey M Grabowski, Amber Hopf-Jannasch, Erik Gough, Ernesto Nakayasu, Carol D Blair, John T Belisle, Catherine A Hill, Richard J Kuhn, Rushika Perera
We describe the first comprehensive analysis of the midgut metabolome of Aedes aegypti, the primary mosquito vector for arboviruses such as dengue, Zika, chikungunya and yellow fever viruses. Transmission of these viruses depends on their ability to infect, replicate and disseminate from several tissues in the mosquito vector. The metabolic environments within these tissues play crucial roles in these processes. Since these viruses are enveloped, viral replication, assembly and release occur on cellular membranes primed through the manipulation of host metabolism...
February 2018: PLoS Pathogens
https://www.readbyqxmd.com/read/29444675/current-and-future-distribution-of-aedes-aegypti-and-aedes-albopictus-diptera-culicidae-in-who-eastern-mediterranean-region
#6
Els Ducheyne, Nhu Nguyen Tran Minh, Nabil Haddad, Ward Bryssinckx, Evans Buliva, Frédéric Simard, Mamunur Rahman Malik, Johannes Charlier, Valérie De Waele, Osama Mahmoud, Muhammad Mukhtar, Ali Bouattour, Abdulhafid Hussain, Guy Hendrickx, David Roiz
BACKGROUND: Aedes-borne diseases as dengue, zika, chikungunya and yellow fever are an emerging problem worldwide, being transmitted by Aedes aegypti and Aedes albopictus. Lack of up to date information about the distribution of Aedes species hampers surveillance and control. Global databases have been compiled but these did not capture data in the WHO Eastern Mediterranean Region (EMR), and any models built using these datasets fail to identify highly suitable areas where one or both species may occur...
February 14, 2018: International Journal of Health Geographics
https://www.readbyqxmd.com/read/29444287/mosquitoes-of-northwestern-uganda
#7
J-P Mutebi, M B Crabtree, R C Kading, A M Powers, J P Ledermann, E C Mossel, N Zeidner, J J Lutwama, B R Miller
Despite evidence of arbovirus activity in northwestern Uganda (West Nile Sub-region), there is very limited information on the mosquito fauna of this region. The only published study reported 52 mosquito species in northwestern Uganda but this study took place in 1950 and the information has not been updated for more than 60 yr. In January and June 2011, CO2 baited-light traps were used to collect 49,231 mosquitoes from four different locations, Paraa (9,487), Chobe (20,025), Sunguru (759), and Rhino Camp (18,960)...
February 12, 2018: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29443870/a-point-mutation-v419l-in-the-sodium-channel-gene-from-natural-populations-of-aedes-aegypti-is-involved-in-resistance-to-%C3%AE-cyhalothrin-in-colombia
#8
Yurany Granada, Ana María Mejía-Jaramillo, Clare Strode, Omar Triana-Chavez
Resistance to pyrethroids in mosquitoes is mainly caused by target site insensitivity known as knockdown resistance ( kdr ). In this work, we examined the point mutations present in portions of domains I, II, III, and IV of the sodium channel gene in Aedes aegypti mosquitoes from three Colombian municipalities. A partial region coding for the sodium channel gene from resistant mosquitoes was sequenced, and a simple allele-specific PCR-based assay (AS-PCR) was used to analyze mutations at the population level...
February 14, 2018: Insects
https://www.readbyqxmd.com/read/29438377/modeling-the-spread-of-the-zika-virus-using-topological-data-analysis
#9
Derek Lo, Briton Park
Zika virus (ZIKV), a disease spread primarily through the Aedes aegypti mosquito, was identified in Brazil in 2015 and was declared a global health emergency by the World Health Organization (WHO). Epidemiologists often use common state-level attributes such as population density and temperature to determine the spread of disease. By applying techniques from topological data analysis, we believe that epidemiologists will be able to better predict how ZIKV will spread. We use the Vietoris-Rips filtration on high-density mosquito locations in Brazil to create simplicial complexes, from which we extract homology group generators...
2018: PloS One
https://www.readbyqxmd.com/read/29432729/functional-characterization-and-quantitative-expression-analysis-of-two-gnrh-related-peptide-receptors-in-the-mosquito-aedes-aegypti
#10
Alireza Oryan, Azizia Wahedi, Jean-Paul V Paluzzi
To cope with stressful events such as flight, organisms have evolved various regulatory mechanisms, often involving control by endocrine-derived factors. In insects, two stress-related factors include the gonadotropin-releasing hormone-related peptides adipokinetic hormone (AKH) and corazonin (CRZ). AKH is a pleiotropic hormone best known as a substrate liberator of proteins, lipids and carbohydrates. CRZ has been shown to have roles in pigmentation, ecdysis or act as a cardiostimulatory factor although a universal function has not yet been elucidated...
February 9, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29432488/the-impact-of-insecticide-applications-on-the-dynamics-of-resistance-the-case-of-four-aedes-aegypti-populations-from-different-brazilian-regions
#11
Gabriela de Azambuja Garcia, Mariana Rocha David, Ademir de Jesus Martins, Rafael Maciel de Freitas, Jutta Gerlinde Birggitt Linss, Simone Costa Araújo, José Bento Pereira Lima, Denise Valle
BACKGROUND: In the tropics, the utilization of insecticides is still an important strategy for controlling Aedes aegypti, the principle vector of dengue, chikungunya and Zika viruses. However, increasing insecticide resistance in Ae. aegypti populations might hinder insecticide efficacy on a long-term basis. It will be important to understand the dynamics and evolution of insecticide resistance by assessing its frequency and the mechanisms by which it occurs. METHODOLOGY/PRINCIPAL FINDINGS: The insecticide resistance status of four Brazilian Ae...
February 12, 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29432454/history-dependence-in-insect-flight-decisions-during-odor-tracking
#12
Rich Pang, Floris van Breugel, Michael Dickinson, Jeffrey A Riffell, Adrienne Fairhall
Natural decision-making often involves extended decision sequences in response to variable stimuli with complex structure. As an example, many animals follow odor plumes to locate food sources or mates, but turbulence breaks up the advected odor signal into intermittent filaments and puffs. This scenario provides an opportunity to ask how animals use sparse, instantaneous, and stochastic signal encounters to generate goal-oriented behavioral sequences. Here we examined the trajectories of flying fruit flies (Drosophila melanogaster) and mosquitoes (Aedes aegypti) navigating in controlled plumes of attractive odorants...
February 12, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29430347/carica-papaya-papaya-latex-a-new-paradigm-to-combat-against-dengue-and-filariasis-vectors-aedes-aegypti-and-culex-quinquefasciatus-diptera-culicidae
#13
Rajkuberan Chandrasekaran, Prabukumar Seetharaman, Muthukumar Krishnan, Sathishkumar Gnanasekar, Sivaramakrishnan Sivaperumal
This study manifests the larvicidal efficacy of Carica papaya latex extract and silver nanoparticles (CPAgNPs) synthesized using latex, against developing immature juveniles of Aedes aegypti and Culex quinquefasciatus. Briefly, the latex was collected and fractioned with different solvents such as chloroform, methanol and aqueously. The obtained crude extracts were subjected to larvicidal activity in the dose-dependent method. After 24 h, the mortality rate was calculated and statistically analyzed. From the results, it was demonstrated that the chloroform extract displayed prominent activity in IInd and IIIrd instar larvae of A...
February 2018: 3 Biotech
https://www.readbyqxmd.com/read/29429122/optimal-control-approach-for-establishing-wmelpop-wolbachia-infection-among-wild-aedes-aegypti-populations
#14
Doris E Campo-Duarte, Olga Vasilieva, Daiver Cardona-Salgado, Mikhail Svinin
Wolbachia-based biocontrol has recently emerged as a potential method for prevention and control of dengue and other vector-borne diseases. Major vector species, such as Aedes aegypti females, when deliberately infected with Wolbachia become less capable of getting viral infections and transmitting the virus to human hosts. In this paper, we propose an explicit sex-structured population model that describes an interaction of uninfected (wild) male and female mosquitoes and those deliberately infected with wMelPop strain of Wolbachia in the same locality...
February 10, 2018: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/29425195/a-natural-agonist-of-mosquito-trpa1-from-the-medicinal-plant-cinnamosma-fragrans-that-is-toxic-antifeedant-and-repellent-to-the-yellow-fever-mosquito-aedes-aegypti
#15
Edna Alfaro Inocente, Marguerite Shaya, Nuris Acosta, L Harinantenaina Rakotondraibe, Peter M Piermarini
Plants produce various secondary metabolites that offer a potential source of novel insecticides and repellents for the control of mosquito vectors. Plants of the genus Cinnamosma are endemic to, and widely-distributed throughout, the island of Madagascar. The barks of these species are commonly used in traditional medicines for treating a wide range of maladies. The therapeutic nature of the bark is thought to be associated with its enrichment of pungent drimane sesquiterpenes, which elicit antifeedant and toxic effects in some insects...
February 9, 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29422087/integrated-vector-control-of-aedes-aegypti-mosquitoes-around-target-houses
#16
Roberto Barrera, Manuel Amador, Jorge Munoz, Veronica Acevedo
BACKGROUND: The developing fetuses of pregnant women are at high risk of developing serious birth defects following Zika virus infections. We applied an Integrated Vector Control (IVC) approach using source reduction, larviciding, and mass trapping with non-insecticidal sticky traps to protect targeted houses by reducing the density of female Aedes aegypti mosquitoes. METHODS: We tested the hypothesis that Ae. aegypti density could be reduced to below three female mosquitoes/trap/week around a target house in the center of a circular area with a 150 m radius using IVC...
February 8, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29415070/evidence-for-chikungunya-and-dengue-transmission-in-quelimane-mozambique-results-from-an-investigation-of-a-potential-outbreak-of-chikungunya-virus
#17
Vánio André Mugabe, Sadia Ali, Imelda Chelene, Vanessa Onofre Monteiro, Onélia Guiliche, Argentina Felisbela Muianga, Flora Mula, Virgílio António, Inocêncio Chongo, John Oludele, Kerstin Falk, Igor A Paploski, Mitermayer G Reis, Uriel Kitron, Beate M Kümmerer, Guilherme S Ribeiro, Eduardo Samo Gudo
BACKGROUND: In January 2016, health authorities from Zambézia province, Mozambique reported the detection of some patients presenting with fever, arthralgia, and a positive result for chikungunya in an IgM-based Rapid Diagnostic Test (RDT). We initiated a study to investigate a potential chikungunya outbreak in the city of Quelimane. METHODS/PRINCIPAL FINDINGS: From February to June 2016, we conducted a cross-sectional study enrolling febrile patients attending five outpatient health units in Quelimane...
2018: PloS One
https://www.readbyqxmd.com/read/29412361/entomopathogenic-fungi-and-their-potential-for-the-management-of-aedes-aegypti-diptera-culicidae-in-the-americas
#18
Harry C Evans, Simon L Elliot, Robert W Barreto
Classical biological control has been used extensively for the management of exotic weeds and agricultural pests, but never for alien insect vectors of medical importance. This simple but elegant control strategy involves the introduction of coevolved natural enemies from the centre of origin of the target alien species. Aedes aegypti - the primary vector of the dengue, yellow fever and Zika flaviviruses - is just such an invasive alien in the Americas where it arrived accidentally from its West African home during the slave trade...
March 2018: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/29412343/the-influence-of-a-light-and-dark-cycle-on-the-egg-laying-activity-of-aedes-aegypti-linnaeus-1762-diptera-culicidae
#19
Luana Cristina Farnesi, Christine Silveira Barbosa, Luciana Ordunha Araripe, Rafaela Vieira Bruno
BACKGROUND: The epidemiological importance of the mosquito Aedes aegypti as a vector of multiple human pathogens has generated a growing number of studies on the physiology and behaviour of its blood-feeding females. The activity of oviposition is one of the critical elements contributing to the expansion of Ae. aegypti's populations. Although there is a vast literature about oviposition behaviour, significant specific knowledge about egg viability and female fertility under light and dark conditions is still lacking...
February 5, 2018: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/29412306/clinical-and-epidemiological-teaching-of-dengue-through-simulated-practice
#20
João Henrique de Morais Ribeiro, Eloá Otrenti, Renata Ferreira Takahashi, Lúcia Yasuko Izumi Nichiata, Maria Clara Padoveze, Érica Gomes Pereira, Sebastião Silveira Nunes Júnior, Anna Luiza de Fátima Pinho Lins Gryschek, Suely Itsuko Ciosak
OBJECTIVE: to describe the experience of clinical teaching on dengue and the practice of epidemiological surveillance using problematization methodology. METHOD: report of experience on educational activity with undergraduate nursing students, held in March 2016, at a public university in the city of São Paulo, conceived in four stages: dialogic lecture, active search of Aedes aegypti, case study and simulation of nursing consultation to individuals with dengue...
March 2018: Revista Brasileira de Enfermagem
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