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Aedes aegypti

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https://www.readbyqxmd.com/read/28630299/bacteria-mediated-hypoxia-functions-as-a-signal-for-mosquito-development
#1
Kerri L Coon, Luca Valzania, David A McKinney, Kevin J Vogel, Mark R Brown, Michael R Strand
Mosquitoes host communities of microbes in their digestive tract that consist primarily of bacteria. We previously reported that several mosquito species, including Aedes aegypti, do not develop beyond the first instar when fed a nutritionally complete diet in the absence of a gut microbiota. In contrast, several species of bacteria, including Escherichia coli, rescue development of axenic larvae into adults. The molecular mechanisms underlying bacteria-dependent growth are unknown. Here, we designed a genetic screen around E...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28630112/rapid-evolution-of-ovarian-biased-genes-in-the-yellow-fever-mosquito-aedes-aegypti
#2
Carrie A Whittle, Cassandra G Extavour
Males and females exhibit highly dimorphic phenotypes, particularly in their gonads, which is believed to be driven largely by differential gene expression. Typically, the protein sequences of genes upregulated in males, or male-biased genes, evolve rapidly as compared to female-biased and unbiased genes. To date, the specific study of gonad-biased genes remains uncommon in metazoans. Here, we identified and studied a total of 2,927, 2,013 and 4,449 coding-sequences (CDS) with ovary-biased, testis-biased and unbiased expression respectively in the yellow-fever mosquito Aedes aegypti The results showed that ovary-biased and unbiased CDS had higher nonsynonymous to synonymous substitution rates (dN/dS) and lower optimal codon usage (those codons that promote efficient translation) than testis-biased genes...
June 19, 2017: Genetics
https://www.readbyqxmd.com/read/28628464/early-evidence-for-zika-virus-circulation-among-aedes-aegypti-mosquitoes-rio-de-janeiro-brazil
#3
Tania Ayllón, Renata de Mendonça Campos, Patrícia Brasil, Fernanda Cristina Morone, Daniel Cardoso Portela Câmara, Guilherme Louzada Silva Meira, Egbert Tannich, Kristie Aimi Yamamoto, Marilia Sá Carvalho, Renata Saraiva Pedro, Jonas Schmidt-Chanasit, Daniel Cadar, Davis Fernandes Ferreira, Nildimar Alves Honório
During 2014-2016, we conducted mosquito-based Zika virus surveillance in Rio de Janeiro, Brazil. Results suggest that Zika virus was probably introduced into the area during May-November 2013 via multiple in-country sources. Furthermore, our results strengthen the hypothesis that Zika virus in the Americas originated in Brazil during October 2012-May 2013.
August 15, 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28627853/determinants-of-outbreaks-of-emerging-infectious-diseases-the-case-of-chikungunya-in-indian-ocean-2004-2007
#4
Antoine Flahault
Emerging outbreaks of arboviroses are most often tied to the convergence of a set of factors which have physical and environmental, genetic and biological, ecological, social, political and economic origins. Thirteen out of these factors are known as main determinants of emerging infectious disease outbreaks. This paper assesses the role of these factors from exploring the Chikungunya outbreak which occurred in Indian Ocean in 2004-2007, as case study. Chikungunya is an alphavirus borne and transmitted by Aedes aegypti and Aedes albopictus...
May 3, 2017: Revue Médicale Suisse
https://www.readbyqxmd.com/read/28623959/the-impact-of-wolbachia-infection-on-the-rate-of-vertical-transmission-of-dengue-virus-in-brazilian-aedes-aegypti
#5
Etiene Casagrande Pacidônio, Eric Pearce Caragata, Debora Magalhães Alves, João Trindade Marques, Luciano Andrade Moreira
BACKGROUND: Wolbachia pipientis is a common endosymbiotic bacterium of arthropods that strongly inhibits dengue virus (DENV) infection and transmission in the primary vector, the mosquito Aedes aegypti. For that reason, Wolbachia-infected Ae. aegypti are currently being released into the field as part of a novel strategy to reduce DENV transmission. However, there is evidence that DENV can be transmitted vertically from mother to progeny, and this may help the virus persist in nature in the absence of regular human transmission...
June 17, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28615847/larvicidal-potency-of-marine-actinobacteria-isolated-from-mangrove-environment-against-aedes-aegypti-and-anopheles-stephensi
#6
S Balakrishnan, P Santhanam, M Srinivasan
The marine soil samples were collected from different locations of Parangipettai mangrove ecosystem, Vellar estuary, southeast coast of India. Totally 30 different marine actinobacteria were isolated by serial dilution plate technique on starch casein agar medium. The isolated actinobacteria were investigated for their larvicidal activity against Aedes aegypti and Anopheles stephensi mosquitoes. Streptomyces fungicidicus, S. griseus, S. albus, S. alboflavus and S. rochei were identified as potential biocide producers...
June 2017: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/28614394/first-report-of-naturally-infected-aedes-aegypti-with-chikungunya-virus-genotype-ecsa-in-the-americas
#7
André Luis Costa-da-Silva, Rafaella Sayuri Ioshino, Vivian Petersen, Antonio Fernando Lima, Marielton Dos Passos Cunha, Michael R Wiley, Jason T Ladner, Karla Prieto, Gustavo Palacios, Danuza Duarte Costa, Lincoln Suesdek, Paolo Marinho de Andrade Zanotto, Margareth Lara Capurro
BACKGROUND: The worldwide expansion of new emergent arboviruses such as Chikungunya and Zika reinforces the importance in understanding the role of mosquito species in spreading these pathogens in affected regions. This knowledge is essential for developing effective programs based on species specificity to avoid the establishment of endemic transmission cycles sustained by the identified local vectors. Although the first autochthonous transmission of Chikungunya virus was described in 2014 in the north of Brazil, the main outbreaks were reported in 2015 and 2016 in the northeast of Brazil...
June 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28610876/a-single-substitution-changes-zika-virus-infectivity-in-mosquitoes
#8
Guan-Zhu Han
Zika virus (ZIKV) has caused outbreaks in the Pacific and the Americas. The mechanism underlying the recent ZIKV epidemic remains obscure. A recent study reveals that an amino acid substitution is associated with increased infectivity of ZIKV in the Aedes aegypti mosquito.
June 10, 2017: Trends in Microbiology
https://www.readbyqxmd.com/read/28610594/the-genetic-diversity-and-population-structure-of-domestic-aedes-aegypti-diptera-culicidae-in-yunnan-province-southwestern-china
#9
Qing-Ming Shi, Heng-Duan Zhang, Gang Wang, Xiao-Xia Guo, Dan Xing, Yan-De Dong, Li Xiao, Jian Gao, Qin-Mei Liu, Ai-Juan Sun, Chun-Xiao Li, Tong-Yan Zhao
BACKGROUND: There was no record of Aedes aegypti in Yunnan Province, China, until 2002, but this species is now continuously found in nine cities (or counties). Until now, little was known about the genetic diversity and population structure of this invasive species. Thus, a detailed understanding of the invasion strategies, colonisation and dispersal of this mosquito from a population genetics perspective is urgently needed for controlling and eliminating this disease vector. METHODS: The genetic diversity and population structure of Ae...
June 13, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28604781/deltamethrin-resistance-in-aedes-aegypti-results-in-treatment-failure-in-merida-mexico
#10
Gonzalo M Vazquez-Prokopec, Anuar Medina-Barreiro, Azael Che-Mendoza, Felipe Dzul-Manzanilla, Fabian Correa-Morales, Guillermo Guillermo-May, Wilbert Bibiano-Marín, Valentín Uc-Puc, Eduardo Geded-Moreno, José Vadillo-Sánchez, Jorge Palacio-Vargas, Scott A Ritchie, Audrey Lenhart, Pablo Manrique-Saide
The operational impact of deltamethrin resistance on the efficacy of indoor insecticide applications to control Aedes aegypti was evaluated in Merida, Mexico. A randomized controlled trial quantified the efficacy of indoor residual spraying (IRS) against adult Ae. aegypti in houses treated with either deltamethrin (to which local Ae. aegypti expressed a high degree of resistance) or bendiocarb (to which local Ae. aegypti were fully susceptible) as compared to untreated control houses. All adult Ae. aegypti infestation indices during 3 months post-spraying were significantly lower in houses treated with bendiocarb compared to untreated houses (odds ratio <0...
June 12, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28604113/qsar-models-for-predicting-the-toxicity-of-piperidine-derivatives-against-aedes-aegypti
#11
J P Doucet, E Papa, A Doucet-Panaye, J Devillers
QSAR models are proposed for predicting the toxicity of 33 piperidine derivatives against Aedes aegypti. From 2D topological descriptors, calculated with the PaDEL software, ordinary least squares multilinear regression (OLS-MLR) treatment from the QSARINS software and machine learning and related approaches including linear and radial support vector machine (SVM), projection pursuit regression (PPR), radial basis function neural network (RBFNN), general regression neural network (GRNN) and k-nearest neighbours (k-NN), led to four-variable models...
June 12, 2017: SAR and QSAR in Environmental Research
https://www.readbyqxmd.com/read/28599659/zika-vector-transmission-risk-in-temperate-australia-a-vector-competence-study
#12
Jean-Bernard Duchemin, Peter T Mee, Stacey E Lynch, Ravikiran Vedururu, Lee Trinidad, Prasad Paradkar
BACKGROUND: Zika virus is an emerging pathogen of global importance. It has been responsible for recent outbreaks in the Americas and in the Pacific region. This study assessed five different mosquito species from the temperate climatic zone in Australia and included Aedes albopictus as a potentially invasive species. METHODS: Mosquitoes were orally challenged by membrane feeding with Zika virus strain of Cambodia 2010 origin, belonging to the Asian clade. Virus infection and dissemination were assessed by quantitative PCR on midgut and carcass after dissection...
June 9, 2017: Virology Journal
https://www.readbyqxmd.com/read/28597156/molecular-characterization-of-indigenous-bacillus-thuringiensis-strains-isolated-from-kashmir-valley
#13
A L Reyaz, L Gunapriya, P Indra Arulselvi
Bacillus thuringiensis (Bt) being an eco-friendly bioinsecticide is effectively used in pest management strategies and, therefore, isolation and identification of new strains effective against a broad range of target pests is important. In the present study, new indigenous B. thuringiensis strains were isolated and investigated so that these could be used as an alternative and/or support the current commercial strains/cry proteins in use. For this, 159 samples including soil, leaf and spider webs were collected from ten districts of Kashmir valley (India)...
June 2017: 3 Biotech
https://www.readbyqxmd.com/read/28595653/habitat-productivity-and-pyrethroid-susceptibility-status-of-aedes-aegypti-mosquitoes-in-dar-es-salaam-tanzania
#14
Leah Mathias, Vito Baraka, Anitha Philbert, Ester Innocent, Filbert Francis, Gamba Nkwengulila, Eliningaya J Kweka
BACKGROUND: Aedes aegypti (Diptera: Culicidae) is the main vector of the dengue virus globally. Dengue vector control is mainly based on reducing the vector population through interventions, which target potential breeding sites. However, in Tanzania, little is known about this vector's habitat productivity and insecticide susceptibility status to support evidence-based implementation of control measures. The present study aimed at assessing the productivity and susceptibility status of A...
June 9, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28590226/comparative-efficiency-of-biogents-gravid-aedes-trap-cdc-autocidal-gravid-ovitrap-and-cdc-gravid-trap-in-northeastern-florida
#15
James E Cilek, Jennifer A Knapp, Alec G Richardson
We conducted a study to compare the effectiveness of the Biogents Gravid Aedes Trap (BG-GAT) and Centers for Disease Control and Prevention (CDC) Autocidal Gravid Ovitrap (AGO) with that of the CDC Gravid Trap (CDC-GT) (as a standard) for their proficiency to collect mosquitoes in an urban residential neighborhood in northeastern Florida. Aedes aegypti , Ae. albopictus, and Culex quinquefasciatus were collected from each trap, with the latter species being predominant. Significantly more Cx. quinquefasciatus were collected from CDC-GT traps compared with the other 2 traps...
June 2017: Journal of the American Mosquito Control Association
https://www.readbyqxmd.com/read/28590218/comparison-of-mosquito-abundance-from-biogents-sentinel-2-0-traps-with-and-without-rain-covers
#16
James E Cilek, Joshua R Weston, Alec G Richardson
Biogents Sentinel (BGS) traps have rapidly become a standard for adult Aedes aegypti surveillance. Several investigators have found that trap collections can be damaged easily by heavy dew or rain entering the trap intake port. In addition, water entering the trap may temporarily stop the fan, thus reducing the collection potential of the trap. We evaluated the effectiveness of a rain cover designed to minimize damage to mosquito trap collections from BGS 2.0 traps in a residential backyard in Jacksonville, FL...
June 2017: Journal of the American Mosquito Control Association
https://www.readbyqxmd.com/read/28590217/field-evaluation-of-indoor-thermal-fog-and-ultra-low-volume-applications-for-control-of-aedes-aegypti-in-thailand
#17
A Ponlawat, J F Harwood, J L Putnam, C Nitatsukprasert, A Pongsiri, U Kijchalao, K J Linthicum, D L Kline, G G Clark, P J Obenauer, C W Doud, P W Mccardle, A G Richardson, D E Szumlas, J H Richardson
Efficacies of a handheld thermal fogger (Patriot™) and a backpack ultra-low volume (ULV) sprayer (Twister™) with combinations of 2 different adulticides (pyrethrin, deltamethrin) and an insect growth regulator (pyriproxyfen) were field-tested and compared for their impact on reducing indoor Aedes aegypti populations in Thailand. The effectiveness of the indoor space sprays was evaluated by sampling the natural Ae. aegypti population in houses and determining their physiological status, by monitoring mortality of sentinel caged mosquitoes (AFRIMS strain) and by assessing larval mortality in laboratory bioassays using water exposed to the spray...
June 2017: Journal of the American Mosquito Control Association
https://www.readbyqxmd.com/read/28590216/diagnostic-doses-of-insecticides-for-adult-aedes-aegypti-to-assess-insecticide-resistance-in-cuba
#18
María Magdalena Rodríguez, Ariel Crespo, Daymi Hurtado, Ilario Fuentes, Jorge Rey, Juan Andrés Bisset
The objective of this study was to determine diagnostic doses (DDs) of 5 insecticides for the Rockefeller susceptible strain of Aedes aegypti , using the Centers for Disease Control and Prevention (CDC) bottle bioassay as a tool for monitoring insecticide resistance in the Cuban vector control program. The 30-min DD values determined in this study were 13.5 μg/ml, 6.5 μg/ml, 6 μg/ml, 90.0 μg/ml, and 15.0 μg/ml for cypermethrin, deltamethrin, lambda-cyhalothrin, chlorpyrifos, and propoxur, respectively...
June 2017: Journal of the American Mosquito Control Association
https://www.readbyqxmd.com/read/28587836/functional-characterization-of-aedes-aegypti-alkaline-phosphatase-alp1-involved-in-the-toxicity-of-cry-toxins-from-bacillus-thuringiensis-subsp-israelensis-and-jegathesan
#19
Jianwu Chen, Karly Aimanova, Sarjeet S Gill
Presently three major groups of proteins from Aedes aegypti, cadherin, alkaline phosphatases (ALP) and aminopeptidases N (APN), have been identified as Cry11Aa toxin receptors. To further characterize their role on toxicity, transgenic mosquitoes with silenced Aedes cadherin expression were previously generated and the role of cadherin in mediating the toxicity of four different mosquitocidal toxins (Cry11Aa, Cry11Ba, Cry4Aa and Cry4Ba) was demonstrated. Here, we investigated the role of another reported Cry11Aa receptor, ALP1...
June 3, 2017: Peptides
https://www.readbyqxmd.com/read/28583207/knockdown-resistance-kdr-of-the-voltage-gated-sodium-channel-gene-of-aedes-aegypti-population-in-denpasar-bali-indonesia
#20
Penny Humaidah Hamid, Joko Prastowo, Anis Widyasari, Anja Taubert, Carlos Hermosilla
BACKGROUND: Aedes aegypti is the main vector of several arthropod-borne viral infections in the tropics profoundly affecting humans, such as dengue fever (DF), West Nile (WN), chikungunya and more recently Zika. Eradication of Aedes still largely depends on insecticides, which is the most cost-effective strategy, and often inefficient due to resistance development in exposed Aedes populations. We here conducted a study of Ae. aegypti resistance towards several insecticides regularly used in the city of Denpasar, Bali, Indonesia...
June 5, 2017: Parasites & Vectors
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