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Aedes aegypti

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https://www.readbyqxmd.com/read/29049958/sublethal-exposure-to-deltamethrin-reduces-the-abilities-of-giant-water-bugs-to-prey-upon-aedes-aegypti-larvae
#1
Wilson R Valbon, Franciele M Cruz, Gabryele S Ramos, Hudson V V Tomé, Eugênio E Oliveira
Freshwater ecosystems provide environmental conditions for many arthropod species, including pests like mosquitoes and beneficial insects. Giant water bugs, Belostoma anurum (Hemiptera: Belostomatidae), are aquatic insects that provide biological control of mosquitoes and small vertebrates in freshwater environments. However, the application of insecticides aiming to control mosquitoes can lead to insecticide exposures of aquatic predators that can result in their death or significant reductions in their behavioral abilities...
October 10, 2017: Chemosphere
https://www.readbyqxmd.com/read/29048583/comparative-efficacy-of-commercial-mosquito-coils-against-aedes-aegypti-diptera-culicidae-in-malaysia-a-nationwide-report
#2
A C Chin, C D Chen, V L Low, H L Lee, A A Azidah, K W Lau, M Sofian-Azirun
This study was conducted using the glass chamber method to determine the susceptibility status of the dengue vector, Aedes aegypti (L.) from 11 states in Malaysia to commercial mosquito coils containing four different active ingredients, namely metofluthrin, d-allethrin, d-trans allethrin, and prallethrin. Aedes aegypti exhibited various knockdown rates, ranging from 14.44% to 100.00%, 0.00% to 61.67%, 0.00% to 90.00%, and 0.00% to 13.33% for metofluthrin, d-allethrin, d-trans allethrin, and prallethrin, respectively...
October 1, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/29044325/evaluation-of-embryotoxic-and-embryostatic-effects-of-the-aqueous-extract-of-rhizophora-mangle-and-tannic-acid-on-eggs-and-larvae-of-aedes-aegypti
#3
Ageu A Rodrigues, Plínio P Gomes, Mauricio C Silva, Cláudia S A Lima, Ricardo Yara, Emília B Guimarães, Eduarda S DE Santana, Luzia A DA Silva, Eduardo J R V DE Lira, Jeymesson R C Vieira
Rhizophora mangle is an abundant plant in mangroves and tannic acid is a polyphenol produced by the secondary metabolism of plants. The aim of the study was to evaluate the embryotoxic and embriostatic effects of the aqueous extract of R. mangle and synthetic tannic acid on eggs and larvae of Aedes aegypti. A. aegypti eggs were exposed in duplicate at concentrations of 250, 500, 750 and 1000 µg/mL of extract and tannic acid for a period of 14 days. Mineral water was used as a negative control. The eggs were observed and counted in a stereomicroscope (1...
October 16, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/29040730/diurnal-temperature-range-and-chikungunya-virus-infection-in-invasive-mosquito-vectors
#4
Barry W Alto, Keenan Wiggins, Bradley Eastmond, Sara Ortiz, Kylie Zirbel, L Philip Lounibos
Climate strongly influences the geographic distribution and timing of mosquito-borne disease outbreaks. Environmental temperature affects phenotypic traits of mosquitoes including vector competence for arboviruses mediated by changes in infection, extrinsic incubation period and in rates of transmission. Most experiments, however, are done at constant temperatures. In nature, mosquitoes are more likely to experience daily fluctuations in temperature. Here we compare disseminated infection (leg infection) and saliva infection of Aedes aegypti (L...
October 10, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29040719/the-effect-of-insecticidal-stress-on-reproductive-output-of-susceptible-and-field-strains-of-aedes-aegypti-diptera-culicidae
#5
Lee-Jin Bong, Wu-Chun Tu, Kok-Boon Neoh, Chin-Gi Huang, Rou-Xing Ting
The phenomenon of high egg reproduction when mortality risk rises is common in mosquitoes. However, the phenomenon may vary between insecticide susceptible and field-collected strains, due to the latter's decreased energy allocation in reproduction in the presence of insecticide resistance. In this study, we evaluated the effect of chlorpyrifos (CP) and temephos (TP) exposure on the oviposition and survival of Aedes aegypti (Linnaeus) (Diptera: Culicidae) using a susceptible strain (KHsm) and two field strains (KHly and TNnorth)...
October 10, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29040304/characterization-of-the-zika-virus-induced-small-rna-response-in-aedes-aegypti-cells
#6
Margus Varjak, Claire L Donald, Timothy J Mottram, Vattipally B Sreenu, Andres Merits, Kevin Maringer, Esther Schnettler, Alain Kohl
RNA interference (RNAi) controls arbovirus infections in mosquitoes. Two different RNAi pathways are involved in antiviral responses: the PIWI-interacting RNA (piRNA) and exogenous short interfering RNA (exo-siRNA) pathways, which are characterized by the production of virus-derived small RNAs of 25-29 and 21 nucleotides, respectively. The exo-siRNA pathway is considered to be the key mosquito antiviral response mechanism. In Aedes aegypti-derived cells, Zika virus (ZIKV)-specific siRNAs were produced and loaded into the exo-siRNA pathway effector protein Argonaute 2 (Ago2); although the knockdown of Ago2 did not enhance virus replication...
October 17, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29039731/patchy-dna-forms-of-the-zika-virus-rna-genome-are-generated-following-infection-in-mosquito-cell-cultures-and-in-mosquitoes
#7
Dilip K Nag, Laura D Kramer
Zika virus (ZIKV) is a mosquito-borne flavivirus and has historically been reported to cause mild symptomatic diseases during human infections. More recently, the explosion of microcephaly among infants born to ZIKV-infected women has made ZIKV a global public health concern. While ZIKV causes acute human diseases, infections of vector mosquitoes are basically non-pathogenic, allowing persistent infections and conferring lifelong ability to transmit the virus. Recent studies have revealed that DNA forms of arboviral RNA genomes play a significant role in viral persistence in mosquitoes...
October 17, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/29038510/lure-and-kill-yeast-interfering-rna-larvicides-targeting-neural-genes-in-the-human-disease-vector-mosquito-aedes-aegypti
#8
Limb K Hapairai, Keshava Mysore, Yingying Chen, Elizabeth I Harper, Max P Scheel, Alexandra M Lesnik, Longhua Sun, David W Severson, Na Wei, Molly Duman-Scheel
New mosquito control strategies are vitally needed to address established arthropod-borne infectious diseases such as dengue and yellow fever and emerging diseases such as Zika and chikungunya, all of which are transmitted by the disease vector mosquito Aedes aegypti. In this investigation, Saccharomyces cerevisiae (baker's yeast) was engineered to produce short hairpin RNAs (shRNAs) corresponding to the Aedes aegypti orthologs of fasciculation and elongation protein zeta 2 (fez2) and leukocyte receptor cluster (lrc) member, two genes identified in a recent screen for A...
October 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29035317/systematic-review-land-cover-meteorological-and-socioeconomic-determinants-of-aedes-mosquito-habitat-for-risk-mapping
#9
REVIEW
Mohamed F Sallam, Chelsea Fizer, Andrew N Pilant, Pai-Yei Whung
Asian tiger and yellow fever mosquitoes (Aedes albopictus and Ae. aegypti) are global nuisances and are competent vectors for viruses such as Chikungunya (CHIKV), Dengue (DV), and Zika (ZIKV). This review aims to analyze available spatiotemporal distribution models of Aedes mosquitoes and their influential factors. A combination of five sets of 3-5 keywords were used to retrieve all relevant published models. Five electronic search databases were used: PubMed, MEDLINE, EMBASE, Scopus, and Google Scholar through 17 May 2017...
October 16, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29032497/emerging-mosquito-species-in-germany-a-synopsis-after-6%C3%A2-years-of-mosquito-monitoring-2011-2016
#10
Helge Kampen, Astrid Schuhbauer, Doreen Walther
Globalisation and climate change are the main drivers of invasion of non-endemic regions by mosquitoes. Mass transportation of people, animals and goods facilitate accidental long-distance displacement while climate warming supports active spread and establishment of thermophilic species. In the framework of a mosquito-monitoring programme, eight non-indigenous culicid species have been registered in Germany since 2011, with four of them being more or less efficient vectors of disease agents and another four now considered established...
October 14, 2017: Parasitology Research
https://www.readbyqxmd.com/read/29029298/the-effect-of-larval-diet-on-adult-survival-swarming-activity-and-copulation-success-in-male-aedes-aegypti-diptera-culicidae
#11
Bethan J Lang, Stefano Idugboe, Kirelle McManus, Florence Drury, Alima Qureshi, Lauren J Cator
Control of Aedes aegypti (L.) (Diptera: Culicidae) populations is vital for reducing the transmission of several pervasive human diseases. The success of new vector control technologies will be influenced by the fitness of laboratory-reared transgenic males. However, there has been relatively little published data on how rearing practices influence male fitness in Aedes mosquitoes. In the laboratory, the effect of larval food availability on adult male fitness was tested, using a range of different fitness measures...
October 4, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29029153/modeling-the-environmental-suitability-for-aedes-stegomyia-aegypti-and-aedes-stegomyia-albopictus-diptera-culicidae-in-the-contiguous-united-states
#12
Tammi L Johnson, Ubydul Haque, Andrew J Monaghan, Lars Eisen, Micah B Hahn, Mary H Hayden, Harry M Savage, Janet McAllister, John-Paul Mutebi, Rebecca J Eisen
The mosquitoes Aedes (Stegomyia) aegypti (L.)(Diptera:Culicidae) and Ae. (Stegomyia) albopictus (Skuse) (Diptera:Culicidae) transmit dengue, chikungunya, and Zika viruses and represent a growing public health threat in parts of the United States where they are established. To complement existing mosquito presence records based on discontinuous, non-systematic surveillance efforts, we developed county-scale environmental suitability maps for both species using maximum entropy modeling to fit climatic variables to county presence records from 1960-2016 in the contiguous United States...
September 21, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29029151/combined-toxicity-of-three-essential-oils-against-aedes-aegypti-diptera-culicidae-larvae
#13
Ephantus J Muturi, Jose L Ramirez, Kenneth M Doll, Michael J Bowman
Essential oils are potential alternatives to synthetic insecticides because they have low mammalian toxicity, degrade rapidly in the environment, and possess complex mixtures of bioactive constituents with multi-modal activity against the target insect populations. Twenty-one essential oils were initially screened for their toxicity against Aedes aegypti (L.) larvae and three out of the seven most toxic essential oils (Manuka, oregano, and clove bud essential oils) were examined for their chemical composition and combined toxicity against Ae...
October 4, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29026852/effect-of-climatic-conditions-and-water-bodies-on-population-dynamics-of-the-dengue-vector-aedes-aegypti-diptera-culicidae
#14
Shabab Nasir, Farhat Jabeen, Sadia Abbas, Iram Nasir, Mustapha Debboun
BACKGROUND: The population of mosquitoes is mainly influenced by the biotic and abiotic factors. Although Aedes aegypti was reported until 1960's in the Punjab, Pakistan, the population has increased dramatically since 2009 and caused severe epidemics in 2011 due to heavy floods and rains. Thus, this study was carried out to know the effect of biotic and abiotic factors on the population of Aedes aegypti. METHODS: Mosquitoes were collected from fresh, sewage, and rain water ponds, fish ponds, rice fields, tyres, tree holes, and manmade storage containers present in and around residential homes twice during every winter (October-February), summer (March-June) and monsoon season (July-September) from marked rural areas...
March 2017: Journal of Arthropod-borne Diseases
https://www.readbyqxmd.com/read/29019762/central-nervous-system-effects-of-intrauterine-zika-virus-infection-a-pictorial-review
#15
Bianca Guedes Ribeiro, Heron Werner, Flávia P P L Lopes, L Celso Hygino da Cruz, Tatiana M Fazecas, Pedro A N Daltro, Renata A Nogueira
Relatively few agents have been associated with congenital infections involving the brain. One such agent is the Zika virus, which has caused several outbreaks worldwide and has spread in the Americas since 2015. The Zika virus is an arbovirus transmitted by infected female mosquito vectors, such as the Aedes aegypti mosquito. This virus has been commonly associated with congenital infections of the central nervous system and has greatly increased the rates of microcephaly. Ultrasonography (US) remains the method of choice for fetal evaluation of congenital Zika virus infection...
October 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/29017613/a-multiplex%C3%A2-pcr-for-detection-of-knockdown-resistance-mutations-v1016g-and-f1534c-in-pyrethroid-resistant-aedes-aegypti
#16
Jassada Saingamsook, Atiporn Saeung, Jintana Yanola, Nongkran Lumjuan, Catherine Walton, Pradya Somboon
BACKGROUND: Mutation of the voltage-gated sodium channel (VGSC) gene, or knockdown resistance (kdr) gene, is an important resistance mechanism of the dengue vector Aedes aegypti mosquitoes against pyrethroids. In many countries in Asia, a valine to glycine substitution (V1016G) and a phenylalanine to cysteine substitution (F1534C) are common in Ae. aegypti populations. The G1016 and C1534 allele frequencies have been increasing in recent years, and hence there is a need to have a simple and inexpensive tool to monitor the alleles in large scale...
October 10, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/29017606/temporal-distribution-and-insecticide-resistance-profile-of-two-major-arbovirus-vectors-aedes-aegypti-and-aedes-albopictus-in-yaound%C3%A3-the-capital-city-of-cameroon
#17
Basile Kamgang, Aurelie P Yougang, Micareme Tchoupo, Jacob M Riveron, Charles Wondji
BACKGROUND: Aedes aegypti and Ae. albopictus are the major epidemic vectors of several arbovirus diseases such as yellow fever, dengue, Zika and chikungunya worldwide. Both Aedes vectors are presents in Cameroon; however, knowledge on the dynamic of the distribution of these species across cities and their resistance profile to insecticide are limited. Here, we assessed the current distribution of Ae. aegypti and Ae. albopictus in Yaoundé, the Capital City, established the resistance profile to insecticides and explored the resistance mechanisms involved...
October 10, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28993269/hydrogen-peroxide-resistance-in-strigomonas-culicis-effects-on-mitochondrial-functionality-and-aedes-aegypti-interaction
#18
Ana Cristina Souza Bombaça, Felipe de Almeida Dias, Vitor Ennes-Vidal, Aline Dos Santos Garcia-Gomes, Marcos Henrique Ferreira Sorgine, Claudia Masini d'Avila-Levy, Rubem Figueiredo Sadok Menna-Barreto
Reactive oxygen species (ROS) are toxic molecules involved in several biological processes such as cellular signaling, proliferation, differentiation and cell death. Adaptations to oxidative environments are crucial for the success of the colonization of insects by protozoa. Strigomonas culicis is a monoxenic trypanosomatid found in the midgut of mosquitoes and presenting a life cycle restricted to the epimastigote form. Among S. culicis peculiarities, there is an endosymbiotic bacterium in the cytoplasm, which completes essential biosynthetic routes of the host cell and may represent an intermediary evolutive step in organelle origin, thus constituting an interesting model for evolutive researches...
October 7, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28992792/evaluation-of-gamma-radiation-induced-dna-damage-in-aedes-aegypti-using-the-comet-assay
#19
Vinaya Shetty, N J Shetty, S R Ananthanarayana, S K Jha, R C Chaubey
The study was undertaken to evaluate gamma radiation-induced DNA damage in Aedes aegypti. The comet assay was employed to demonstrate the extent of DNA damage produced in adult male A. aegypti exposed to seven different doses of gamma radiation, ranging from 1 Gy to 50 Gy. DNA damage was measured as the percentage of comet tail DNA. A significant linear increase in DNA damage was observed in all samples; the extent of damage being proportional to the dose of gamma radiation the organism received, except in those treated with 1 Gy...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28991902/how-does-competition-among-wild-type-mosquitoes-influence-the-performance-of-aedes-aegypti-and-dissemination-of-wolbachia-pipientis
#20
Suellen de Oliveira, Daniel Antunes Maciel Villela, Fernando Braga Stehling Dias, Luciano Andrade Moreira, Rafael Maciel de Freitas
BACKGROUND: Wolbachia has been deployed in several countries to reduce transmission of dengue, Zika and chikungunya viruses. During releases, Wolbachia-infected females are likely to lay their eggs in local available breeding sites, which might already be colonized by local Aedes sp. mosquitoes. Therefore, there is an urgent need to estimate the deleterious effects of intra and interspecific larval competition on mosquito life history traits, especially on the duration of larval development time, larval mortality and adult size...
October 2017: PLoS Neglected Tropical Diseases
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