11,116 results match your criteria aegypti


Insecticide resistance in Aedes aegypti from Tapachula, Mexico: Spatial variation and response to historical insecticide use.

PLoS Negl Trop Dis 2021 Sep 27;15(9):e0009746. Epub 2021 Sep 27.

Colorado State University, College of Veterinary Medicine and Biomedical Sciences Department of Microbiology, Immunology and Pathology, Arthropod Borne and Infectious Diseases Laboratory, Fort Collins, Colorado, United States of America.

Background: Insecticide use continues as the main strategy to control Aedes aegypti, the vector of dengue, Zika, chikungunya, and yellow fever. In the city of Tapachula, Mexico, mosquito control programs switched from pyrethroids to organophosphates for outdoor spatial spraying in 2013. Additionally, the spraying scheme switched from total coverage to focused control, prioritizing areas with higher entomological-virological risk. Read More

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September 2021

Indel Detection following CRISPR/Cas9 Mutagenesis using High-resolution Melt Analysis in the Mosquito Aedes aegypti.

J Vis Exp 2021 Sep 10(175). Epub 2021 Sep 10.

Department of Entomology and Agrilife Research, Texas A&M University;

Mosquito gene editing has become routine in several laboratories with the establishment of systems such as transcription-activator-like effector nucleases (TALENs), zinc-finger nucleases (ZFNs), and homing endonucleases (HEs). More recently, clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 9 (Cas9) technology has offered an easier and cheaper alternative for precision genome engineering. Following nuclease action, DNA repair pathways will fix the broken DNA ends, often introducing indels. Read More

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September 2021

in the Mediterranean container ports at the time of climate change: A time bomb on the mosquito vector map of Europe.

Authors:
Attila J Trájer

Heliyon 2021 Sep 11;7(9):e07981. Epub 2021 Sep 11.

Sustainability Solutions Research Lab, University of Pannonia, Egyetem utca 10, H-8200, Veszprém, Hungary.

In the past, was present in Southern Europe. Although the mosquito was eradicated from the Mediterranean region, its regional ecotype survived the second half of the 20 century in the eastern Black Sea area. The aim of the study was to model the changes in the altering climatic suitability, ontogenetic development time and the survival rate of from first-stage larvae to adulthood in Southern Europe. Read More

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September 2021

Use of transcriptional age grading technique to determine the chronological age of Sri Lankan Aedes aegypti and Aedes albopictus females.

Parasit Vectors 2021 Sep 26;14(1):493. Epub 2021 Sep 26.

Vector Biology Department, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, L3 5QA, UK.

Background: Aedes aegypti and Ae. albopictus are important vectors of human diseases such as dengue, chikungunya, and zika. In Sri Lanka, they have been responsible for transmitting dengue virus. Read More

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September 2021

Mosquito Distribution along a Transect from Rural to Urban Settings in Yaoundé, Cameroon.

Insects 2021 Sep 12;12(9). Epub 2021 Sep 12.

Institut de Recherche de Yaoundé (IRY), Organisation de Coordination pour la Lutte Contre les Endémies en Afrique Centrale (OCEAC), Yaoundé P.O. Box 288, Cameroon.

Introduction: The surveillance of mosquito vectors is important for the control of arboviruses diseases worldwide. Detailed information on the bionomics and distribution of their main vectors, and is essential for assessing disease transmission risk and for better planning of control interventions.

Methods: Entomological surveys were carried out from November 2019 to November 2020 in six localities of Yaoundé city following a transect from urban to rural settings: two urban (Obili, Mvan), two peri-urban (Simbock, Ahala) and two rural areas (Lendom, Elig-essomballa)-during rainy and dry seasons. Read More

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September 2021

Long-Range But Not Short-Range Attraction of Male Aedes aegypti (Diptera: Culicidae) Mosquitoes to Humans.

J Med Entomol 2021 Sep 24. Epub 2021 Sep 24.

Pest and Environmental Adaptation Research Group, Bio21 Institute and the School of BioSciences, The University of Melbourne, Parkville, Victoria, Australia.

Female Aedes aegypti (Linnaeus) mosquitoes integrate multiple sensory cues to locate human hosts for blood meals. Although male Ae. aegypti swarm around and land on humans in nature to mate, direct evidence of attraction to humans is limited. Read More

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September 2021

A diagnostic primer pair to distinguish between wMel and wAlbB Wolbachia infections.

PLoS One 2021 23;16(9):e0257781. Epub 2021 Sep 23.

Pest and Environmental Adaptation Research Group, Bio21 Institute and the School of BioSciences, The University of Melbourne, Parkville, Victoria, Australia.

Detection of the Wolbachia endosymbiont in Aedes aegypti mosquitoes through real-time polymerase chain reaction assays is widely used during and after Wolbachia releases in dengue reduction trials involving the wMel and wAlbB strains. Although several different primer pairs have been applied in current successful Wolbachia releases, they cannot be used in a single assay to distinguish between these strains. Here, we developed a new diagnostic primer pair, wMwA, which can detect the wMel or wAlbB infection in the same assay. Read More

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September 2021

Biochemical characterization of Aedes aegypti (Linnaeus) (Diptera: Culicidae) resistance to deltamethrin, fipronil, and imidacloprid.

Environ Monit Assess 2021 Sep 20;193(10):665. Epub 2021 Sep 20.

Department of Entomology, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, Punjab, Pakistan.

Aedes aegypti is an important vector of dengue fever, dengue hemorrhagic fever and yellow fever, chikungunya, and Zika virus. The objective was to evaluate the resistance of A. aegypti exposed to insecticides with different action modes (deltamethrin, imidacloprid, and fipronil) under intense selection pressure for 10 generations in laboratory. Read More

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September 2021

Determinants of Aedes mosquito density as an indicator of arbovirus transmission risk in three sites affected by co-circulation of globally spreading arboviruses in Colombia, Ecuador and Argentina.

Parasit Vectors 2021 Sep 19;14(1):482. Epub 2021 Sep 19.

School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada.

Background: The global impact of Zika virus in Latin America has drawn renewed attention to circulating mosquito-borne viruses in this region, such as dengue and chikungunya. Our objective was to assess socio-ecological factors associated with Aedes mosquito vector density as a measure of arbovirus transmission risk in three cities of potentially recent Zika virus introduction: Ibagué, Colombia; Manta, Ecuador; and Posadas, Argentina, in order to inform disease mitigation strategies.

Methods: We sampled Aedes mosquito populations in a total of 1086 households, using indoor and peridomestic mosquito collection methods, including light traps, resting traps, traps equipped with chemical attractant and aspirators. Read More

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September 2021

Multi-Year Mass-Trapping With Autocidal Gravid Ovitraps has Limited Influence on Insecticide Susceptibility in Aedes aegypti (Diptera: Culicidae) From Puerto Rico.

J Med Entomol 2021 Sep 17. Epub 2021 Sep 17.

Dengue Branch, Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, San Juan, Puerto Rico.

Mass-trapping has been used to control outbreaks of Aedes aegypti (Linnaeus) (Diptera: Culicidae) in Puerto Rico since 2011. We investigated the effect of multi-year, insecticide-free mass trapping had on the insecticide susceptibility profile of Ae. aegypti. Read More

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September 2021

Rhamnolipids and essential oils in the control of mosquito-borne tropical diseases.

Appl Microbiol Biotechnol 2021 Sep 15. Epub 2021 Sep 15.

Department of General and Applied Biology, Institute of Biosciences, São Paulo State University-Unesp, Rio Claro, São Paulo, Brazil.

The diseases transmitted by mosquito vectors are a great public health issue. Thus, effective vector control becomes the main strategy to reduce their prevalence. However, insecticide resistance has become a huge concern for the mitigation of mosquitoes; here, we propose the use of rhamnolipids in emulsion with clove oil against Aedes aegypti and Culex quinquefasciatus. Read More

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September 2021

Identification of Phasi Charoen-Like Phasivirus in Field Collected from Karnataka State, India.

Vector Borne Zoonotic Dis 2021 Sep 14. Epub 2021 Sep 14.

Directorate of Health and Family Welfare Services, Bangalore, Karnataka, India.

A wide range of insect-specific viruses (ISVs) have been reported worldwide. There are no studies from India that have reported ISVs. The current study describes the identification of Phasi Charoen-like virus (PCLV) from mosquito-pools from six districts of Karnataka state, India. Read More

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September 2021

Cananga odorata (Magnoliales: Annonaceae) Essential Oil Produces Significant Avoidance Behavior in Mosquitoes.

J Med Entomol 2021 Sep 13. Epub 2021 Sep 13.

Department of Entomology, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand.

Essential oil of Cananga odorata Hook. F. & Tomson is a source of insect repellent, but contact irritancy and noncontact repellency actions that stimulate insect's avoidance behavior (escape away from chemical source after direct physical contact or without making physical contact, respectively) have not been investigated. Read More

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September 2021

Studying the Activity of Neuropeptides and Other Regulators of the Excretory System in the Adult Mosquito.

J Vis Exp 2021 Aug 24(174). Epub 2021 Aug 24.

Department of Biology, York University;

Studies of insect physiology, particularly in those species that are vectors of pathogens causing disease in humans and other vertebrates, provide the foundation to develop novel strategies for pest control. Here, a series of methods are described that are routinely utilized to determine the functional roles of neuropeptides and other neuronal factors (i.e. Read More

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Bioefficacy of mosquito mat vaporizers and associated metabolic detoxication mechanisms in Aedes aegypti (Linnaeus) in Selangor, Malaysia: A statewide assessment.

Trop Biomed 2021 Sep;38(3):327-337

Higher Institution Centre of Excellence (HICoE), Tropical Infectious Diseases Research & Education Centre (TIDREC), Universiti Malaya, 50603 Kuala Lumpur, Malaysia.

This study aims to examine the efficacy of mosquito mat vaporizers on Aedes aegypti and their associated metabolic detoxication mechanisms. For this purpose, Aedes aegypti (Linnaeus) was collected from nine districts in Selangor, Malaysia and tested with mosquito vaporizing mat bioassays. The same populations were also subjected to biochemical assays to investigate activities of detoxifying enzymes, namely non-specific esterase (EST), glutathione-S-transferase (GST) and mixed function oxidase (MFO). Read More

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September 2021

Suppressing mosquito populations with precision guided sterile males.

Nat Commun 2021 Sep 10;12(1):5374. Epub 2021 Sep 10.

Division of Biological Sciences, Section of Cell and Developmental Biology, University of California, San Diego, La Jolla, CA, USA.

The mosquito Aedes aegypti is the principal vector for arboviruses including dengue/yellow fever, chikungunya, and Zika virus, infecting hundreds of millions of people annually. Unfortunately, traditional control methodologies are insufficient, so innovative control methods are needed. To complement existing measures, here we develop a molecular genetic control system termed precision-guided sterile insect technique (pgSIT) in Aedes aegypti. Read More

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September 2021

Host-seeking behavior and fecundity of the female Aedes aegypti to human blood types.

Pest Manag Sci 2021 Sep 10. Epub 2021 Sep 10.

Institute of Apicultural Research/Key Laboratory of Pollinating Insect Biology, Ministry of Agriculture, Chinese Academy of Agricultural Sciences, Beijing, China.

Background: Mosquitoes express different degrees of preference towards hosts depending on behavioral, ecological, and physiological factors. These preferences have implications for mosquito-borne disease risk. This study investigated the effect of human blood groups on the behavior and fecundity of the female Aedes aegypti (Diptera: Culicidae) from March 2018 to August 2019. Read More

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September 2021

The role of urbanisation in the spread of Aedes mosquitoes and the diseases they transmit-A systematic review.

PLoS Negl Trop Dis 2021 Sep 9;15(9):e0009631. Epub 2021 Sep 9.

Heidelberg Institute of Global Health, Research to Practice Group, Heidelberg University, Heidelberg, Germany.

Background: This systematic review aims to assess how different urbanisation patterns related to rapid urban growth, unplanned expansion, and human population density affect the establishment and distribution of Aedes aegypti and Aedes albopictus and create favourable conditions for the spread of dengue, chikungunya, and Zika viruses.

Methods And Findings: Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, a systematic review was conducted using the PubMed, Virtual Health Library, Cochrane, WHO Library Database (WHOLIS), Google Scholar, and and the Institutional Repository for Information Sharing (IRIS) databases. From a total of 523 identified studies, 86 were selected for further analysis, and 29 were finally analysed after applying all inclusion and exclusion criteria. Read More

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September 2021

Olfaction-Related Gene Expression in the Antennae of Female Mosquitoes From Common Laboratory Strains.

Front Physiol 2021 23;12:668236. Epub 2021 Aug 23.

Department of Biology, New Mexico State University, Las Cruces, NM, United States.

Adult female mosquitoes rely on olfactory cues like carbon dioxide and other small molecules to find vertebrate hosts to acquire blood. The molecular physiology of the mosquito olfactory system is critical for their host preferences. Many laboratory strains of the yellow fever mosquito have been established since the late 19th century. Read More

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Identification of locally isolated entomopathogenic Fusarium species from the soil of Changa Manga Forest, Pakistan and evaluation of their larvicidal efficacy against Aedes aegypti.

Braz J Biol 2021 6;83:e246230. Epub 2021 Sep 6.

Lahore College for Women University, Environmental Science Department, Lahore, Pakistan.

Dengue fever vectored by the mosquito Aedes aegypti is one of the most rapidly spreading insect-borne diseases. Current reliance of dengue vector control is mostly on chemical insecticides. Growing insecticide resistance in the primary mosquito vector, Aedes aegypti, limits the effectiveness of vector control through chemical insecticides. Read More

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September 2021

Household-level risk factors for Aedes aegypti pupal density in Guayaquil, Ecuador.

Parasit Vectors 2021 Sep 7;14(1):458. Epub 2021 Sep 7.

Centro de Investigación en Vectores Artrópodos, Instituto Nacional de Investigación en Salud Pública "Dr. Leopoldo Izquieta Pérez", Quito, Ecuador.

Background: Vector-borne diseases are a major cause of disease burden in Guayaquil, Ecuador, especially arboviruses spread by Aedes aegypti mosquitoes. Understanding which household characteristics and risk factors lead to higher Ae. aegypti densities and consequent disease risk can help inform and optimize vector control programs. Read More

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September 2021

Assessment of fitness and vector competence of a New Caledonia wMel Aedes aegypti strain before field-release.

PLoS Negl Trop Dis 2021 Sep 7;15(9):e0009752. Epub 2021 Sep 7.

World Mosquito Program, Institut Pasteur of New Caledonia, Noumea, New Caledonia.

Background: Biological control programs involving Wolbachia-infected Aedes aegypti are currently deployed in different epidemiological settings. New Caledonia (NC) is an ideal location for the implementation and evaluation of such a strategy as the only proven vector for dengue virus (DENV) is Ae. aegypti and dengue outbreaks frequency and severity are increasing. Read More

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September 2021

Identification and characterization of a new cry-like gene found in a Bacillus cereus strain.

Antonie Van Leeuwenhoek 2021 Sep 7. Epub 2021 Sep 7.

Departamento de Biotecnología y Bioquímica, Centro de Investigación y de Estudios Avanzados. Cinvestav-Irapuato, Apartado postal 692, 36500, Irapuato, GTO., México.

Bacillus thuringiensis is the most successful microbial insecticide against different pests in agriculture and vectors of diseases. Its activity is mostly attributed to the Cry proteins expressed during its sporulation phase. However, these proteins are not exclusive to B. Read More

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September 2021

Entomological characterization of Aedes mosquitoes and arbovirus detection in Ibagué, a Colombian city with co-circulation of Zika, dengue and chikungunya viruses.

Parasit Vectors 2021 Sep 6;14(1):446. Epub 2021 Sep 6.

Centro de Investigaciones en Microbiología y Parasitología Tropical (CIMPAT), Universidad de Los Andes, Bogotá, Colombia.

Background: Dengue, Zika and chikungunya are arboviruses of significant public health importance that are transmitted by Aedes aegypti and Aedes albopictus mosquitoes. In Colombia, where dengue is hyperendemic, and where chikungunya and Zika were introduced in the last decade, more than half of the population lives in areas at risk. The objective of this study was to characterize Aedes spp. Read More

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September 2021

-Conferred Antiviral Protection Is Determined by Developmental Temperature.

mBio 2021 Sep 7:e0292320. Epub 2021 Sep 7.

Instituto Gulbenkian de Ciência, Oeiras, Portugal.

Wolbachia is a maternally transmitted bacterium that is widespread in arthropods and filarial nematodes and confers strong antiviral protection in Drosophila melanogaster and other arthropods. -transinfected Aedes aegypti mosquitoes are currently being deployed to fight transmission of dengue and Zika viruses. However, the mechanism of antiviral protection and the factors influencing are still not fully understood. Read More

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September 2021

Infection With Trypanosomatid Alters Midgut Redox Metabolism and Reduces Mosquito Reproductive Fitness.

Front Cell Infect Microbiol 2021 13;11:732925. Epub 2021 Aug 13.

Laboratório de Biologia Celular, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil.

mosquitoes transmit arboviruses of important global health impact, and their intestinal microbiota can influence vector competence by stimulating the innate immune system. Midgut epithelial cells also produce toxic reactive oxygen species (ROS) by dual oxidases (DUOXs) that are essential players in insect immunity. is a monoxenous trypanosomatid that naturally inhabits mosquitoes; it hosts an endosymbiotic bacterium that completes essential biosynthetic pathways of the parasite and influences its oxidative metabolism. Read More

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Multi-Omic Analysis of Symbiotic Bacteria Associated With Breeding Sites.

Front Microbiol 2021 12;12:703711. Epub 2021 Aug 12.

Vector Behavior and Pathogen Interaction Group, Instituto René Rachou (FIOCRUZ), Belo Horizonte, Brazil.

Mosquito breeding sites are complex aquatic environments with wide microbial diversity and physicochemical parameters that can change over time during the development of immature insect stages. Changes in biotic and abiotic conditions in water can alter life-history traits of adult mosquitos but this area remains understudied. Here, using microbial genomic and metabolomics analyses, we explored the metabolites associated with breeding sites as well as the potential contribution of sp. Read More

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Sugar feeding protects against arboviral infection by enhancing gut immunity in the mosquito vector Aedes aegypti.

PLoS Pathog 2021 Sep 2;17(9):e1009870. Epub 2021 Sep 2.

MRC-University of Glasgow Centre for Virus Research, Glasgow, United Kingdom.

As mosquito females require a blood meal to reproduce, they can act as vectors of numerous pathogens, such as arboviruses (e.g. Zika, dengue and chikungunya viruses), which constitute a substantial worldwide public health burden. Read More

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September 2021

Effects of the short- and long-term accumulation of detritus in larval habitats on life history traits of Aedes aegypti in temperate Argentina.

Authors:
P Montini S Fischer

Med Vet Entomol 2021 Sep 1. Epub 2021 Sep 1.

Departamento de Ecología, Genética y Evolución, and Instituto de Ecología, Genética y Evolución de Buenos Aires (UBA-CONICET), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.

Aedes aegypti larvae that develop in containers largely depend on plant detritus as a source of nutritional resources. However, few studies have evaluated the performance of immature individuals under natural amounts and quality of this food source. Here, we aimed to assess the effect of the variation in the accumulation time and amount of detritus on life history traits of Ae. Read More

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September 2021

Mel genome remains stable after 7 years in Australian field populations.

Microb Genom 2021 Sep;7(9)

Institute of Vector-Borne Disease, Monash University, Melbourne, Victoria, Australia.

Infection of Mel in imparts two signature features that enable its application for biocontrol of dengue. First, the susceptibility of mosquitoes to viruses such as dengue and Zika is reduced. Second, a reproductive manipulation is caused that enables Mel introgression into wild-type mosquito populations. Read More

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September 2021