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Aedes aegypti

Luciano Pamplona de Góes Cavalcanti, Rafael Henrique Machado Sacramento, Fernanda Montenegro de Carvalho Araújo, Danielle Malta Lima, Carlos Carlos Henrique Alencar, Victor Emanuel Pessoa Martins, Lucas Venâncio Araújo, Tais Castelo de Oliveira
OBJECTIVE: Dengue remains an important public health problem in Brazil. We estimated the associated factors of dengue seroprevalence among native Indians of the Tremembé ethnic and their knowledge about the aspects related to the presence of mosquitoes of the genus Aedes. METHODS: An analytical cross-sectional study and a prospective environmental study to monitor the trapping of mosquito eggs monthly were performed. The serological portion of the study involved indigenous people living in the village of Tapera in northeastern Brazil...
April 19, 2018: Tropical Medicine & International Health: TM & IH
Rosilawati Rasli, Han Lim Lee, Nazni Wasi Ahmad, Siti Futri Farahininajua Fikri, Roziah Ali, Khairul Asuad Muhamed, Azahari Abdul Hadi, Qi-Yong Liu, Feng Xia Meng
This study is intended to provide a comprehensive characterization of the resistance mechanisms in the permethrin-selected (IMR-PSS) and laboratory susceptible (IMR-LS) Aedes aegypti strain from Malaysia. Both IMR-PSS and IMR-LS provide a standard model for use in assessing the pyrethroid resistance in field-collected strains collected from three dengue hotspots: the Taman Seri Bayu (TSB), the Flat Camar (FC), and the Taman Dahlia (TD). Two established methods for determining the resistance mechanisms of the pyrethroid are the quantification of detoxification enzymes via enzyme microassay and the nucleotide sequencing of the domain 2 region from segment 1 to 6 via classical polymerase chain reaction (PCR) amplification-were employed...
April 18, 2018: Insects
Luciana Ordunha Araripe, Jéssica Rodrigues Assunção Bezerra, Gustavo Bueno da Silva Rivas, Rafaela Vieira Bruno
BACKGROUND: The study of physiological and behavioral traits of mosquito vectors has been of growing relevance for the proposition of alternative methods for controlling vector-borne diseases. Despite this, most studies focus on the female's traits, including the behavior of host seeking, the physiology of disease transmission and the site-choice for oviposition. However, understanding the factors that lead to males' reproductive success is of utmost importance, since it can help building new strategies for constraining population growth...
April 18, 2018: Parasites & Vectors
Saravanan Tamilselvan, Arulsamy Mary Manonmani, Purushothaman Jambulingam
Background & objectives: Bacillus thuringiensis var. israelensis (Bti) formulations are presently being used for insect control. In this study, a water dispersible powder (WDP) formulation using fly ash (FA) as a carrier material was developed and studied for its activity against the larval stages of major mosquito vector species. Methods: An indigenous isolate Bti (Vector Control Research Centre B17) was mass produced using a 100 l fermentor in soya-based medium...
December 2017: Indian Journal of Medical Research
Jessica G King, Caetano Souto-Maior, Larissa M Sartori, Rafael Maciel-de-Freitas, M Gabriela M Gomes
Wolbachia has been introduced into Aedes aegypti mosquitoes to control the spread of arboviruses, such as dengue, chikungunya and Zika. Studies showed that certain Wolbachia strains (such as wMel) reduce replication of dengue viruses in the laboratory, prompting the release of mosquitoes carrying the bacterium into the field, where vectorial capacity can be realistically assessed in relation to native non-carriers. Here we apply a new analysis to two published datasets, and show that wMel increases the mean and the variance in Ae...
April 16, 2018: Nature Communications
William M S Yamashita, Shyam S Das, Grigori Chapiro
BACKGROUND: The global incidences of dengue virus have increased the interest in studying and understanding the mosquito population dynamics. It is predominantly spread by Aedes aegypti in the tropical and sub-tropical countries in the world. Understanding these dynamics is important for public health in countries where climatic and environmental conditions are favorable for the propagation of these diseases. For this reason, a new model has been proposed to investigate the population dynamics of mosquitoes in a city...
April 16, 2018: Parasites & Vectors
Evangelina Muttis, Agustin Balsalobre, Ailen Chuchuy, Carolina Mangudo, Alexander T Ciota, Laura D Kramer, María Victoria Micieli
Aedes aegypti (L.) (Diptera: Culicidae) is a vector of many medically significant viruses in the Americas, including dengue virus, chikungunya virus, and Zika virus. Traits such as longevity, fecundity, and feeding behavior contribute to the ability of Ae. aegypti to serve as a vector of these pathogens. Both local environmental factors and population genetics could contribute to variability in these traits. We performed a comparative study of Ae. aegypti populations from four geographically and environmentally distinct collection sites in Argentina in which the cohorts from each population were held at temperature values simulating a daily cycle, with an average of 25°C in order to identify the influence of population on life-history traits...
April 11, 2018: Journal of Medical Entomology
Sarah Zohdy, Wayde C Morse, Derrick Mathias, Victoria Ashby, Sarah Lessard
With the establishment of Zika virus in the Americas, an accurate understanding of the geographic range of its primary vector, Aedes (Stegomyia) aegypti (L.) (Diptera: Culicidae), is vital to assessing transmission risk. In an article published in June 2016, Hahn and colleagues compiled county-level records in the United States for the presence of Ae. aegypti and Aedes (Stegomyia) albopictus (Skuse) (Diptera: Culicidae) reported between January 1995 and March 2016. Despite ecological suitability for both mosquito species along the Gulf Coast, Ae...
April 5, 2018: Journal of Medical Entomology
Barbara Aparecida Chaves, Alessandra Silva Orfano, Paula Monalisa Nogueira, Nilton Barnabe Rodrigues, Thais Bonifácio Campolina, Rafael Nacif-Pimenta, Ana Clara Araújo Machado Pires, Ademir Bentes Vieira Júnior, Andréia da Costa Paz, Evelyn Beatriz da Costa Vaz, Maria das Graças Vale Barbosa Guerra, Breno Melo Silva, Fabrício Freire de Melo, Douglas Eric Norris, Marcus Vinícius Guimarães de Lacerda, Paulo Filemon Paolucci Pimenta, Nágila Francinete Costa Secundino
Background: Several tropical cities are permissive to Aedes aegypti and DENV endemicity, and have allowed for invasion and circulation of ZIKV in the same areas. People living in endemic regions have been simultaneously infected with two or more arboviruses. Methods: Ae. aegypti mosquitoes from Manaus, capital city of the Amazonas State, were coinfected with circulating strains of DENV and ZIKV. The coinfected vectors were allowed to bite BALB/c mice. Results: Ae...
April 6, 2018: Journal of Infectious Diseases
Nur Aida Hashim, Abu Hassan Ahmad, Anita Talib, Farida Athaillah, Kumara Thevan Krishnan
The occurrence of major outbreaks of dengue, and other vector borne diseases such as chikungunya and zika in tropical and subtropical regions has rendered control of the diseases a top-priority for many affected countries including Malaysia. Control of the mosquito vectors Aedes aegypti and Aedes albopictus through the reduction of breeding sites and the application of insecticides to kill immature forms and adults are the main control efforts to combat these diseases. The present study describes the association between Ae...
March 2018: Tropical Life Sciences Research
Doreen J Siria, Elis P A Batista, Mercy A Opiyo, Elizangela F Melo, Robert D Sumaye, Halfan S Ngowo, Alvaro E Eiras, Fredros O Okumu
BACKGROUND: Controlled blood-feeding is essential for maintaining laboratory colonies of disease-transmitting mosquitoes and investigating pathogen transmission. We evaluated a low-cost artificial feeding (AF) method, as an alternative to direct human feeding (DHF), commonly used in mosquito laboratories. METHODS: We applied thinly-stretched pieces of polytetrafluoroethylene (PTFE) membranes cut from locally available seal tape (i.e. plumbers tape, commonly used for sealing pipe threads in gasworks or waterworks)...
April 11, 2018: Parasites & Vectors
Michaela J Schultz, Horacio M Frydman, John H Connor
Aedes mosquitoes are vectors for many pathogenic viruses. Cell culture systems facilitate the investigation of virus growth in the mosquito vector. We found Zika virus (ZIKV) growth to be consistent in A. albopictus cells but hypervariable in A. aegypti cell lines. As a potential explanation of this variability, we tested the hypothesis that our cells harbored opportunistic viruses. We screened Aedes cell lines for the presence of insect specific viruses (ISVs), Cell-fusing agent virus (CFAV) and Phasi charoen-like virus (PCLV)...
April 3, 2018: Virology
Yazhi Li, Xianning Liu
Dengue fever is one of the most important diseases causing illness and death all over the world, which brings tremendous threat to peoples' life and property security, especially in the undeveloped areas. The main vector, Aedes aegypti, must be controlled to prevent the transmission of dengue. There are a variety of methods to control it. Wolbachia is an innovative bacterium which breaks the dengue transmission cycle for its characteristics of cytoplasmic incompatibility and maternal transmission. In this paper, a sex-structured model with birth pulse is established to study the spread of Wolbachia in mosquito population...
April 3, 2018: Journal of Theoretical Biology
Christian E Gunning, Kenichi Okamoto, Helvio Astete, Gissella M Vasquez, Erik Erhardt, Clara Del Aguila, Raul Pinedo, Roldan Cardenas, Carlos Pacheco, Enrique Chalco, Hugo Rodriguez-Ferruci, Thomas W Scott, Alun L Lloyd, Fred Gould, Amy C Morrison
BACKGROUND: Aedes aegypti is a primary vector of dengue, chikungunya, Zika, and urban yellow fever viruses. Indoor, ultra low volume (ULV) space spraying with pyrethroid insecticides is the main approach used for Ae. aegypti emergency control in many countries. Given the widespread use of this method, the lack of large-scale experiments or detailed evaluations of municipal spray programs is problematic. METHODOLOGY/PRINCIPAL FINDINGS: Two experimental evaluations of non-residual, indoor ULV pyrethroid spraying were conducted in Iquitos, Peru...
April 6, 2018: PLoS Neglected Tropical Diseases
Sulaiman A Alshammari, Yousif S Alamri, Fatimah S Rabhan, Aljoharah A Alabdullah, Noura A Alsanie, Fatma A Almarshad, Amal N Alhaqbani
There is high public health alert in the Kingdom of Saudi Arabia concerning Zika virus infection. So far, there is no reported outbreak. So are we at risk of this disease? Reviewing the literature of recent outbreaks of other infectious diseases in Saudi Arabia may clarify the situation. It is evident that there is some similarity between Zika and dengue regarding vector ( Aedes aegypti ) which is available in the Kingdom of Saudi Arabia. Furthermore, they have similar transmission process and the required environment for infection...
January 2018: International Journal of Health Sciences
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No abstract text is available yet for this article.
March 30, 2018: Journal of Medical Entomology
Jessica E Manning, David M Morens, Shaden Kamhawi, Jesus G Valenzuela, Matthew Memoli
Arthropod-borne viruses (arboviruses) are taxonomically diverse causes of significant morbidity and mortality. In recent decades, important mosquito-borne viruses such as West Nile, chikungunya, dengue, and Zika have re-emerged and spread widely, in some cases pandemically, to cause serious public health emergencies. There are no licensed vaccines against most of these viruses, and vaccine development and use has been complicated by the number of different viruses to protect against, by subtype and strain variation, and by the inability to predict when and where outbreaks will occur...
March 29, 2018: Journal of Infectious Diseases
A J Monaghan, K M Sampson, D F Steinhoff, K C Ernst, K L Ebi, B Jones, M H Hayden
The mosquito Aedes (Ae). aegypti transmits the viruses that cause dengue and chikungunya, two globally-important vector-borne diseases. We investigate how choosing alternate emissions and/or socioeconomic pathways may modulate future human exposure to Ae. aegypti . Occurrence patterns for Ae. aegypti for 2061-2080 are mapped globally using empirically downscaled air temperature and precipitation projections from the Community Earth System Model, for the Representative Concentration Pathway (RCP) 4.5 and 8.5 scenarios...
February 2018: Climatic Change
Rahul Brahma, Sanathoi Gurumayum, Leimarembi Devi Naorem, Mathavan Muthaiyan, Jeyakodi Gopal, Amouda Venkatesan
Zika virus (ZIKV), a single-strand RNA flavivirus, is transmitted primarily through Aedes aegypti. The recent outbreaks in America and unexpected association between ZIKV infection and birth defects have triggered the global attention. This vouches to understand the molecular mechanisms of ZIKV infection to develop effective drug therapy. A systems-level understanding of biological process affected by ZIKV infection in fetal brain sample led us to identify the candidate genes for pharmaceutical intervention and potential biomarkers for diagnosis...
April 2, 2018: Viral Immunology
Marcela Nouzova, Kayvan Etebari, Fernando G Noriega, Sassan Asgari
The corpora allata (CA) are a pair of endocrine glands with neural connections to the brain and close association with another neuroendocrine organ, the corpora cardiaca (CC). The CA from adult female Aedes aegypti mosquitoes synthesizes fluctuating levels of juvenile hormone (JH), which have been linked to the ovarian development and are influenced by nutritional signals. In this study, we investigated the potential involvement of microRNAs (miRNAs), a type of small non-coding RNAs, in the regulation of gene expression in CA-CC complexes during mosquito reproductive development, at stages with distinct JH biosynthesis patterns...
March 29, 2018: Insect Biochemistry and Molecular Biology
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