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Aedes aegypti

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https://www.readbyqxmd.com/read/28527892/outbreak-of-zika-virus-infection-in-singapore-an-epidemiological-entomological-virological-and-clinical-analysis
#1
(no author information available yet)
BACKGROUND: An outbreak of Zika virus infection was detected in Singapore in August, 2016. We report the first comprehensive analysis of a national response to an outbreak of Zika virus infection in Asia. METHODS: In the first phase of the outbreak, patients with suspected Zika virus infection were isolated in two national referral hospitals until their serum tested negative for the virus. Enhanced vector control and community engagement measures were deployed in disease clusters, including stepped-up mosquito larvicide and adulticide use, community participation in source reduction (destruction of mosquito breeding sites), and work with the local media to promote awareness of the outbreak...
May 17, 2017: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/28527274/caracter%C3%A3-sticas-de-la-estructura-molecular-de-las-prote%C3%A3-nas-e-del-virus-del-zika-y-e1-del-virus-de-la-rub%C3%A3-ola-y-posibles-implicaciones-en-el-neurotropismo-y-en-las-alteraciones-del-sistema-nervioso
#2
Luis Alberto Gómez, Gladis Montoya, Hernán Mauricio Rivera, Juan Carlos Hernández
Introducción. El virus del Zika (ZIKV) es un flavivirus con envoltura, transmitido a los seres humanos principalmente por el vector Aedes aegypti. La infección por ZIKV se ha asociado con un gran neurotropismo y con efectos neuropáticos, como el síndrome de Guillain-Barré en el adulto y la microcefalia fetal y posnatal, así como con un síndrome de infección congénita similar al producido por el virus de la rubéola (RV).Objetivo. Comparar las estructuras moleculares de la proteína de envoltura E del virus del Zika (E-ZIKV) y de la E1 del virus de la rubéola (E1-RV), y plantear posibles implicaciones en el neurotropismo y en las alteraciones del sistema nervioso asociadas con el ZIKV...
April 1, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/28526066/transovarial-transmission-of-denv-in-aedes-aegypti-in-the-amazon-basin-a-local-model-of-xenomonitoring
#3
Cristiano Fernandes da Costa, Ricardo Augusto Dos Passos, José Bento Pereira Lima, Rosemary Aparecida Roque, Vanderson de Souza Sampaio, Thais Bonifácio Campolina, Nágila Francinete Costa Secundino, Paulo Filemon Paolucci Pimenta
BACKGROUND: Transovarial transmission of dengue virus in Aedes spp. mosquitoes is considered an important mechanism for the maintenance of the virus in nature and may be implicated in the occurrence of outbreaks and epidemics of the disease. However, there are few studies involving transovarial transmission and viral vector monitoring as a surveillance tool and control strategy. The present study evaluated transovarial transmission of dengue virus in Aedes aegypti populations as a xenomonitoring strategy in municipalities of the Amazonas state...
May 19, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28525510/zika-virus-obstetric-and-pediatric-anesthesia-considerations
#4
Jacqueline L Tutiven, Benjamin T Pruden, James S Banks, Mario Stevenson, David J Birnbach
As of November 2016, the Florida Department of Health (FDH) and the Centers for Disease Control and Prevention have confirmed more than 4000 travel-related Zika virus (ZIKV) infections in the United States with >700 of those in Florida. There have been 139 cases of locally acquired infection, all occurring in Miami, Florida. Within the US territories (eg, Puerto Rico, US Virgin Islands), >30,000 cases of ZIKV infection have been reported. The projected number of individuals at risk for ZIKV infection in the Caribbean and Latin America approximates 5 million...
June 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28524874/impact-of-simultaneous-exposure-to-arboviruses-on-infection-and-transmission-by-aedes-aegypti-mosquitoes
#5
Claudia Rückert, James Weger-Lucarelli, Selene M Garcia-Luna, Michael C Young, Alex D Byas, Reyes A Murrieta, Joseph R Fauver, Gregory D Ebel
The recent emergence of both chikungunya and Zika viruses in the Americas has significantly expanded their distribution and has thus increased the possibility that individuals may become infected by more than one Aedes aegypti-borne virus at a time. Recent clinical data support an increase in the frequency of coinfection in human patients, raising the likelihood that mosquitoes could be exposed to multiple arboviruses during one feeding episode. The impact of coinfection on the ability of relevant vector species to transmit any of these viruses (that is, their vector competence) has not been determined...
May 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28523613/eco-friendly-and-cost-effective-ag-nanocrystals-fabricated-using-the-leaf-extract-of-habenaria-plantaginea-toxicity-on-six-mosquito-vectors-and-four-non-target-species
#6
Chinnadurai Aarthi, Marimuthu Govindarajan, Pichaimuthu Rajaraman, Naiyf S Alharbi, Shine Kadaikunnan, Jamal M Khaled, Ramzi A Mothana, Nasir A Siddiqui, Giovanni Benelli
Recently, the biofabrication of metal nanoparticles has gained wide interest owing to its inherent features such as swift, simplicity, eco-friendliness, and cheaper costs. Different green-reducing agents led to the production of nanoparticles with varying toxicity on insects. In the current study, silver nanoparticles (AgNPs) were successfully synthesized using Habenaria plantaginea leaf extract. Ag nanoparticles were studied by UV-Vis spectroscopy (UV-Vis), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), scanning electron microscopy (SEM) coupled with energy-dispersive spectroscopy (EDS), and transmission electron microscopy (TEM)...
May 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28521600/quantitative-structure-activity-relationship-study-of-amide-mosquito-repellents
#7
P Wang, X Xu, S Liao, J Song, G Fan, S Chen, Z Wang
A quantitative structure-activity relationship (QSAR) study on 43 amide repellents was carried out by the heuristic method in order to reveal the correlations between molecular parameters of these amides and their repellency against Aedes aegypti. Sketches and optimizations of molecular structures were achieved by the Gaussian software package. Generation and screening of molecular parameters were accomplished using CODESSA 2.7.10 software. The leave-one-out method was applied for the model validation. The results showed that a four-descriptor QSAR model with r(2) of 0...
April 2017: SAR and QSAR in Environmental Research
https://www.readbyqxmd.com/read/28520817/heat-in-the-southeastern-united-states-characteristics-trends-and-potential-health-impact
#8
Jeremy E Diem, Christine E Stauber, Richard Rothenberg
High summer temperatures in extratropical areas have an impact on the public's health, mainly through heat stress, high air pollution concentrations, and the transmission of tropical diseases. The purpose of this study is to examine the current characteristics of heat events and future projections of summer apparent temperature (AT)-and associated health concerns-throughout the southeastern United States. Synoptic climatology was used to assess the atmospheric characteristics of extreme heat days (EHDs) from 1979-2015...
2017: PloS One
https://www.readbyqxmd.com/read/28514450/evolutionary-enhancement-of-zika-virus-infectivity-in-aedes-aegypti-mosquitoes
#9
Yang Liu, Jianying Liu, Senyan Du, Chao Shan, Kaixiao Nie, Rudian Zhang, Xiao-Feng Li, Renli Zhang, Tao Wang, Cheng-Feng Qin, Penghua Wang, Pei-Yong Shi, Gong Cheng
Zika virus (ZIKV) remained obscure until the recent explosive outbreaks in French Polynesia (2013-2014) and South America (2015-2016). Phylogenetic studies have shown that ZIKV has evolved into African and Asian lineages. The Asian lineage of ZIKV was responsible for the recent epidemics in the Americas. However, the underlying mechanisms through which ZIKV rapidly and explosively spread from Asia to the Americas are unclear. Non-structural protein 1 (NS1) facilitates flavivirus acquisition by mosquitoes from an infected mammalian host and subsequently enhances viral prevalence in mosquitoes...
May 17, 2017: Nature
https://www.readbyqxmd.com/read/28511272/a-location-specific-spreadsheet-for-estimating-zika-risk-and-timing-for-zika-vector-surveillance-using-us-military-facilities-as-an-example
#10
Desmond H Foley, David B Pecor
Local Zika virus transmission in the United States involving one or both of the known vector species, Aedes aegypti and Ae. albopictus, is of major concern. To assist efforts to anticipate the risks of transmission, we developed an Excel spreadsheet tool that uses vector and virus temperature thresholds, remotely sensed maximum temperature, and habitat suitability models to answer the questions: "is Zika transmission likely here?" and "when should we conduct vector surveillance?" An example spreadsheet, updated regularly and freely available, uses near real-time and forecast temperature data to generate guidance, based on a novel four level Zika risk code, for 733 US military facilities in the 50 states, the District of Columbia, and the territories of Guam and Puerto Rico...
January 2017: U.S. Army Medical Department Journal
https://www.readbyqxmd.com/read/28511270/laboratory-and-semi-field-evaluations-of-two-transfluthrin-spatial-repellent-devices-against-aedes-aegypti-l-diptera-culicidae
#11
Lee P McPhatter, Paula D Mischler, Meiling Z Webb, Kamal Chauhan, Erica J Lindroth, Alec G Richardson, Mustapha Debboun
Two transfluthrin-based spatial repellent products (Raid Dual Action Insect Repellent and Home Freshener and Raid Shield (currently not commercially available), SC Johnson, Racine WI) were evaluated for spatial repellent effects against female Aedes aegypti (L.) mosquitoes under laboratory (wind tunnel) and semi-field (outdoor enclosure) conditions. The placement of either product in the wind tunnel significantly reduced host-seeking behaviors. The mean baseline (control) landing counts for the Raid Dual Action and Raid Shield were reduced by 95% and 74% respectively...
January 2017: U.S. Army Medical Department Journal
https://www.readbyqxmd.com/read/28509947/-arboviruses-also-have-an-american-dream
#12
F Rodhain
Some arboviruses that originated in the Old World have been introduced by humans into the American continent. The first of them was the yellow fever virus, coming from the West African coast with slaves in the 17th-19th centuries, followed by dengue viruses, which were always prevalent within the Americas. Next was theWest Nile virus, introduced in New York in 1999, that spread in only a few years over the whole continent. Then, Chikungunya virus arrived on Saint Martin Island in 2013 after its outbreak in Polynesia; it is now widespread in the Caribbean Islands and on the American continent from the United States to Brazil...
May 16, 2017: Bulletin de la Société de Pathologie Exotique
https://www.readbyqxmd.com/read/28506794/life-shortening-wolbachia-infection-reduces-population-growth-of-aedes-aegypti
#13
Eunho Suh, David R Mercer, Stephen L Dobson
Wolbachia bacteria are being introduced into natural populations of vector mosquitoes, with the goal of reducing the transmission of human diseases such as zika and dengue fever. The successful establishment of Wolbachia infection is largely dependent on the effects of Wolbachia infection to host fitness, but the effects of Wolbachia infection on the individual life history traits of immature mosquitoes can vary. Here, the effects of life-shortening Wolbachia (wMelPop) on population growth of infected individuals were evaluated by measuring larval survival, developmental time and adult size of Aedes aegypti in intra- (infected or uninfected only) and inter-group (mixed with infected and uninfected) larval competition assays...
May 12, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28506254/reemergence-of-yellow-fever-in-ethiopia-after-50%C3%A2-years-2013-epidemiological-and-entomological-investigations
#14
Abrham Lilay, Negga Asamene, Abyot Bekele, Mesfin Mengesha, Milliyon Wendabeku, Israel Tareke, Abiy Girmay, Yonas Wuletaw, Abate Adossa, Yamar Ba, Amadou Sall, Daddi Jima, Debritu Mengesha
BACKGROUND: Yellow Fever (YF) is a viral hemorrhagic disease transmitted by aedes mosquito species. Approximately, 200,000 cases and 30,000 deaths occur worldwide every year. In Ethiopia, the last outbreak was reported in 1966 with 2200 cases and 450 deaths. A number of cases with deaths from unknown febrile illness reported from South Ari district starting from November 2012. This investigation was conducted to identify the causative agent, source of the outbreak and recommend appropriate interventions...
May 15, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28506207/the-midgut-transcriptome-of-aedes-aegypti-fed-with-saline-or-protein-meals-containing-chikungunya-virus-reveals-genes-potentially-involved-in-viral-midgut-escape
#15
Shengzhang Dong, Susanta K Behura, Alexander W E Franz
BACKGROUND: The mosquito Aedes aegypti is the primary vector for medically important arthropod-borne viruses, including chikungunya virus (CHIKV). Following oral acquisition, an arbovirus has to persistently infect several organs in the mosquito before becoming transmissible to another vertebrate host. A major obstacle an arbovirus has to overcome during its infection cycle inside the mosquito is the midgut escape barrier, representing the exit mechanism arboviruses utilize when disseminating from the midgut...
May 15, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28504438/aedes-aegypti-l-mosquitoes-in-trinidad-west-indies-longevity-case-studies
#16
Dave D Chadee, Raymond Martinez, Joan M Sutherland
Few laboratory and field studies have reported long survival periods for Ae. aegypti females and even fewer have designed experiments to characterize this important life history trait. This study was conducted under laboratory conditions to determine the number of blood meals taken by individual females, the number of eggs laid per individual female, the length of the gonotrophic cycle, and the duration of female survival. The results showed individual females oviposited between 670 and 1,500 eggs throughout their lifetimes, females undergoing large numbers of gonotrophic cycles and surviving up to 224 days...
June 2017: Journal of Vector Ecology: Journal of the Society for Vector Ecology
https://www.readbyqxmd.com/read/28504433/influence-of-shading-and-pedestrian-traffic-on-the-preference-of-aedes-stegomyia-aegypti-diptera-culicidae-for-oviposition-microenvironments
#17
G P Prado, J S Maciel, G R Leite, M A A Souza
Aedes aegypti mosquitoes are highly adaptable to abiotic stimuli. To evaluate the influence of shading and pedestrian traffic on the preference of Ae. aegypti for oviposition microenvironments, 20 sites were sampled weekly using ovitraps within the perimeter of Universidade Federal do Espírito Santo, located in São Mateus, Espírito Santo, Brazil. A spatial and statistical analysis was performed in order to assess the relationship between shading time, pedestrian traffic, and the presence of biological forms of Ae...
June 2017: Journal of Vector Ecology: Journal of the Society for Vector Ecology
https://www.readbyqxmd.com/read/28502740/isolation-of-an-insulin-like-peptide-from-the-asian-malaria-mosquito-anopheles-stephensi-that-acts-as-a-steroidogenic-gonadotropin-across-diverse-mosquito-taxa
#18
Andrew B Nuss, Mark R Brown
Many insulin-like peptides (ILPs) have been identified in insects, yet only a few were isolated in their native form for structural and functional studies. Antiserum produced to ILP3 in Aedes aegypti was used in a radioimmunoassay to monitor the purification of an ILP from heads of adult An. stephensi and recognized the ILP in other immunoassays. The structure of the purified peptide matched that predicted for the ILP3 in this species. The native form stimulated ecdysteroid production by ovaries isolated from non-blood fed females...
May 11, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28500817/transmission-incompetence-of-culex-quinquefasciatus-and-culex-pipiens-pipiens-from-north-america-for-zika-virus
#19
Joan L Kenney, Hannah Romo, Nisha K Duggal, Wen-Pin Tzeng, Kristen L Burkhalter, Aaron C Brault, Harry M Savage
AbstractIn late 2014, Zika virus (ZIKV; Flaviviridae, Flavivirus) emerged as a significant arboviral disease threat in the Western hemisphere. Aedes aegypti and Aedes albopictus have been considered the principal vectors of ZIKV in the New World due to viral isolation frequency and vector competence assessments. Limited reports of Culex transmission potential have highlighted the need for additional vector competence assessments of North American Culex species. Accordingly, North American Culex pipiens and Culex quinquefasciatus were orally exposed and intrathoracically inoculated with the African prototype ZIKV strain and currently circulating Asian lineage ZIKV strains to assess infection, dissemination, and transmission potential...
May 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28500814/fta-cards-facilitate-storage-shipment-and-detection-of-arboviruses-in-infected-aedes-aegypti-collected-in-adult-mosquito-traps
#20
Sonja Hall-Mendelin, Glen R Hewitson, Doris Genge, Peter J Burtonclay, Amanda J De Jong, Alyssa T Pyke, Andrew F van den Hurk
AbstractThe utility of applying infected Aedes aegypti to Flinders Technology Associates (FTA(®)) cards for storage, transport, and detection of dengue, Zika, and Barmah Forest viruses was assessed in laboratory-based experiments. The mosquitoes had been removed from Gravid Aedes Traps maintained under conditions of high temperature and humidity. RNA of all viruses could be detected in infected mosquitoes on FTA cards either individually or in pools with uninfected mosquitoes, and stored for up to 28 days...
May 2017: American Journal of Tropical Medicine and Hygiene
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