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West Nile virus

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https://www.readbyqxmd.com/read/27912126/evaluation-of-the-inactivation-effect-of-triton-x-100-on-ebola-virus-infectivity
#1
Francesca Colavita, Serena Quartu, Eleonora Lalle, Licia Bordi, Daniele Lapa, Silvia Meschi, Antonella Vulcano, Antonietta Toffoletti, Eugenio Bordi, Maria Grazia Paglia, Antonino Di Caro, Giuseppe Ippolito, Maria Rosaria Capobianchi, Concetta Castilletti
BACKGROUND: The recent Ebola virus disease outbreak occurred in West Africa since December 2013 highlighted the need of appropriate virus inactivation procedures to be set up to allow the necessary processing of specimens outside BSL-4 facilities and to perform laboratory tests without affecting clinical decisions. For this purpose, international guidelines suggest the pre-treatment of the samples with Triton X-100. OBJECTIVES: Due to the limited scientific evidence about the efficacy of Triton X-100 on enveloped-viruses, the aim of this work was to evaluate the effect of Triton X-100 on the virus infectivity and to establish the optimal conditions for its use...
November 22, 2016: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/27906966/archival-isolates-confirm-a-single-topotype-of-west-nile-virus-in-australia
#2
Bixing Huang, Natalie A Prow, Andrew F van den Hurk, Richard J N Allcock, Peter R Moore, Stephen L Doggett, David Warrilow
West Nile virus is globally wide-spread and causes significant disease in humans and animals. The evolution of West Nile virus Kunjin subtype in Australia (WNVKUN) was investigated using archival samples collected over a period of 50 years. Based on the pattern of fixed amino acid substitutions and time-stamped molecular clock analyses, a single long-term lineage (or topotype) was inferred. This implies that a bottleneck exists such that regional strains eventually die out and are replaced with strains from a single source...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27902502/zika-virus-and-patient-blood-management
#3
Lawrence T Goodnough, Marisa B Marques
Sporadic Zika virus infections had only occurred in Africa and Asia until an outbreak in Micronesia (Oceania) in 2007. In 2013 to 2014, several outer Pacific Islands reported local outbreaks. Soon thereafter, the virus was likely introduced in Brazil from competing athletes from French Polynesia and other countries that participated in a competition there. Transmission is thought to have occurred through mosquito bites and spread to the immunologically naive population. Being also a flavivirus, the Zika virus is transmitted by the Aedes mosquito that is endemic in South and Central America that is also the vector of West Nile virus, dengue, and chikungunya...
November 29, 2016: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/27899678/virus-variation-resource-improved-response-to-emergent-viral-outbreaks
#4
Eneida L Hatcher, Sergey A Zhdanov, Yiming Bao, Olga Blinkova, Eric P Nawrocki, Yuri Ostapchuck, Alejandro A Schäffer, J Rodney Brister
The Virus Variation Resource is a value-added viral sequence data resource hosted by the National Center for Biotechnology Information. The resource is located at http://www.ncbi.nlm.nih.gov/genome/viruses/variation/ and includes modules for seven viral groups: influenza virus, Dengue virus, West Nile virus, Ebolavirus, MERS coronavirus, Rotavirus A and Zika virus Each module is supported by pipelines that scan newly released GenBank records, annotate genes and proteins and parse sample descriptors and then map them to controlled vocabulary...
November 28, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27894018/managing-mosquito-spaces-citizen-self-governance-of-disease-vectors-in-a-desert-landscape
#5
Nicolena vonHedemann, Paul Robbins, Melinda K Butterworth, Katheryn Landau, Cory W Morin
Public health agencies' strategies to control disease vectors have increasingly included "soft" mosquito management programs that depend on citizen education and changing homeowner behaviors. In an effort to understand public responses to such campaigns, this research assesses the case of Tucson, Arizona, where West Nile virus presents a serious health risk and where management efforts have focused on public responsibility for mosquito control. Using surveys, interviews, and focus groups, we conclude that citizens have internalized responsibilities for mosquito management but also expect public management of parks and waterways while tending to reject the state's interference with privately owned parcels...
November 25, 2016: Health & Place
https://www.readbyqxmd.com/read/27893348/cost-utility-and-budget-impact-of-methylene-blue-treated-plasma-compared-to-quarantine-plasma
#6
Joseph B Babigumira, Solomon J Lubinga, Emma Castro, Brian Custer
BACKGROUND: Methylene blue and visible light treatment and quarantine are two methods used to reduce adverse events, mostly infections, associated with the transfusion of fresh-frozen plasma. The objective of this study was to estimate and compare the budget impact and cost-utility of these two methods from a payer's perspective. MATERIALS AND METHODS: A budget impact and cost-utility model simulating the risks of hepatitis B virus, hepatitis C virus, cytomegalovirus, a West Nile virus-like infection, allergic reactions and febrile non-haemolytic transfusion reactions achieved using plasma treated with methylene blue and visible light (MBP) and quarantine plasma (QP) was constructed for Spain...
November 16, 2016: Blood Transfusion, Trasfusione del Sangue
https://www.readbyqxmd.com/read/27885488/claudins-in-viral-infection-from-entry-to-spread
#7
REVIEW
Che C Colpitts, Thomas F Baumert
Tight junctions are critically important for many physiological functions, including the maintenance of cell polarity, regulation of paracellular permeability, and involvement in signal transduction pathways to regulate integral cellular processes. Furthermore, tight junctions enable epithelial cells to form physical barriers, which act as an innate immune mechanism that can impede viral infection. Viruses, in turn, have evolved mechanisms to exploit tight junction proteins to gain access to cells or spread through tissues in an infected host...
November 24, 2016: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/27884174/comparative-morphological-and-molecular-analysis-confirms-the-presence-of-the-west-nile-virus-mosquito-vector-culex-univittatus-in-the-iberian-peninsula
#8
Verónica Mixão, Daniel Bravo Barriga, Ricardo Parreira, Maria Teresa Novo, Carla Alexandra Sousa, Eva Frontera, Marietjie Venter, Leo Braack, António Paulo Gouveia Almeida
BACKGROUND: Culex univittatus and Culex perexiguus mosquitoes (Diptera: Culicidae) are competent arbovirus vectors, but with unclear morphological differentiation. In Europe, and in the Iberian Peninsula in particular, the presence of either or both species is controversial. However, in order to conduct adequate surveillance for arboviruses in this region, it is crucial to clarify whether Cx. univittatus is present or not, as well as to critically assess existing differentiation tools...
November 25, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27881649/the-many-faces-of-the-flavivirus-ns5-protein-in-antagonism-of-type-i-interferon-signaling
#9
Sonja M Best
The vector-borne flaviviruses cause severe disease in humans on every inhabited continent on earth. Their transmission by arthropods, particularly mosquitoes, facilitates large emergence events such as witnessed with Zika virus (ZIKV) or West Nile virus in the Americas. Every vector-borne flavivirus examined thus far that causes disease in humans, from dengue virus to ZIKV, antagonizes the host type I interferon (IFN-I) response by preventing JAK-STAT signaling, suggesting that suppression of this pathway is an important determinant of infection...
November 23, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27881079/detection-of-west-nile-virus-in-wild-birds-in-tana-river-and-garissa-counties-kenya
#10
Doris Nyamwaya, Virginia Wang'ondu, Joshua Amimo, George Michuki, Moses Ogugo, Enoch Ontiri, Rosemary Sang, Johanna Lindahl, Delia Grace, Bernard Bett
BACKGROUND: West Nile fever virus is a zoonotic arboviral infection maintained in a sylvatic cycle involving mosquito vectors and birds. It is one the arboviruses whose geographical range is expanding because of climate and land use changes that enhance the densities of mosquitoes and promote mosquito-bird-human interactions. We carried out a survey to determine the reservoirs of WNV among wild birds in Tana River and Garissa counties, Kenya. METHODS: Blood samples were obtained from 361 randomly trapped wild birds...
November 23, 2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27879463/a-tale-of-two-flaviviruses-a-seroepidemiological-study-of-dengue-virus-and-west-nile-virus-transmission-in-the-ouest-and-sud-est-departments-of-haiti
#11
Thomas A Weppelmann, Alexandra Burne, Michael E von Fricken, Maha A Elbadry, Madsen Beau De Rochars, Jacques Boncy, Bernard A Okech
Though plans to eliminate malaria from the island of Hispaniola have recently received much attention, arbovirus surveillance continues to be largely neglected in Haiti. To support surveillance efforts and encourage vector-control strategies, a cross-sectional study of dengue virus (DENV) and West Nile virus (WNV) transmission was conducted using standard seroepidemiological methods. Blood samples (N = 673) were collected from 278 males and 395 females from three locations in the Ouest and Sud-Est Departments of Haiti...
November 22, 2016: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/27872881/infodemiological-data-of-west-nile-virus-disease-in-italy-in-the-study-period-2004-2015
#12
Nicola Luigi Bragazzi, Susanna Bacigaluppi, Chiara Robba, Anna Siri, Giovanna Canepa, Francesco Brigo
Google Trends (GT) was mined from 2004 to 2015, searching for West-Nile virus disease (WNVD) in Italy. GT-generated data were modeled as a time series and were analyzed using classical time series analyses. In particular, correlation between GT-based Relative Search Volumes (RSVs) related to WNVD and "real-world" epidemiological cases in the same study period resulted r=0.76 (p<0.0001) on a monthly basis and r=0.80 (p<0.0001) on a yearly basis. The partial autocorrelation analysis and the spectral analysis confirmed that a 1-year regular pattern could be detected...
December 2016: Data in Brief
https://www.readbyqxmd.com/read/27872814/transcriptional-profiles-of-wnv-neurovirulence-in-a-genetically-diverse-collaborative-cross-population
#13
Richard Green, Courtney Wilkins, Sunil Thomas, Aimee Sekine, Renee C Ireton, Martin T Ferris, Duncan M Hendrick, Kathleen Voss, Fernando Pardo-Manuel de Villena, Ralph S Baric, Mark T Heise, Michael Gale
West Nile Virus (WNV) is a mosquito-transmitted virus from the Flaviviridae family that causes fever in 1 in 5 infected people. WNV can also become neuro-invasive and cross the blood-brain barrier leading to severe neurological symptoms in a subset of WNV infected individuals [1]. WNV neuro-invasion is believed to be influenced by a number of factors including host genetics. In order to explore these effects and recapitulate the complex immune genetic differences among individuals, we studied gene expression following WNV infection in the Collaborative Cross (CC) model...
December 2016: Genomics Data
https://www.readbyqxmd.com/read/27870890/latitudinal-diversity-of-culex-pipiens-biotypes-and-hybrids-in-farm-peri-urban-and-wetland-habitats-in-europe
#14
Chantal B F Vogels, Tim W R Möhlmann, Diede Melsen, Guido Favia, Uno Wennergren, Constantianus J M Koenraadt
Despite the presence of Culex (Cx.) pipiens mosquitoes and circulation of West Nile virus (WNV), WNV outbreaks have so far not occurred in northern Europe. The species Cx. pipiens consists of two morphologically identical biotypes, pipiens and molestus, which can form hybrids. Until now, population dynamic studies of Cx. pipiens have not differentiated between biotypes and hybrids at the European scale, nor have they used comparative surveillance approaches. We therefore aimed to elucidate the relative abundance of Cx...
2016: PloS One
https://www.readbyqxmd.com/read/27865748/a-novel-reverse-genetics-system-for-production-of-infectious-west-nile-virus-using-homologous-recombination-in-mammalian-cells
#15
Shintaro Kobayashi, Kentaro Yoshii, Minato Hirano, Memi Muto, Hiroaki Kariwa
Reverse genetics systems facilitate investigation of many aspects of the life cycle and pathogenesis of viruses. However, genetic instability in Escherichia coli has hampered development of a reverse genetics system for West Nile virus (WNV). In this study, we developed a novel reverse genetics system for WNV based on homologous recombination in mammalian cells. Introduction of the DNA fragment coding for the WNV structural protein together with a DNA-based replicon resulted in the release of infectious WNV...
November 16, 2016: Journal of Virological Methods
https://www.readbyqxmd.com/read/27865265/monitoring-of-west-nile-virus-usutu-virus-and-meaban-virus-in-waterfowl-used-as-decoys-and-wild-raptors-in-southern-spain
#16
E Jurado-Tarifa, S Napp, S Lecollinet, A Arenas, C Beck, M Cerdà-Cuéllar, M Fernández-Morente, I García-Bocanegra
In the last decade, the number of emerging flaviviruses described worldwide has increased considerably, with wild birds acting as the main reservoir hosts of these viruses. We carried out an epidemiological survey to determine the seroprevalence of antigenically related flaviviruses, particularly West Nile virus (WNV), Usutu virus (USUV) and Meaban virus (MBV), in waterfowl used as decoys and wild raptors in Andalusia (southern Spain), the region considered to have the highest risk of flaviviruses circulation in Spain...
December 2016: Comparative Immunology, Microbiology and Infectious Diseases
https://www.readbyqxmd.com/read/27862705/screening-of-living-organ-donors-for-endemic-infections-understanding-the-challenges-and-benefits-of-enhanced-screening
#17
REVIEW
Amanda Rosen, Michael G Ison
Living organ donor candidates are screened for medical and psychosocial contraindications to donation. One important goal of this process is to prevent donor-derived infectious diseases transmissions. These transmissions are exceptionally rare, but have the potential to cause significant morbidity and mortality. The Organ Procurement and Transplantation Network now requires each recovery hospital to develop a protocol for evaluating living donors for tuberculosis and other geographically-defined endemic pathogens, including Trypanosoma cruzi (the causative pathogen of Chagas' disease), Strongyloides stercoralis, and West Nile Virus (WNV), in addition to universal screening for blood-borne pathogens...
November 14, 2016: Transplant Infectious Disease: An Official Journal of the Transplantation Society
https://www.readbyqxmd.com/read/27860011/climatic-ecological-and-socioeconomic-factors-associated-with-west-nile-virus-incidence-in-atlanta-georgia-u-s-a
#18
Graeme Lockaby, Navideh Noori, Wayde Morse, Wayne Zipperer, Latif Kalin, Robin Governo, Rajesh Sawant, Matthew Ricker
The integrated effects of the many risk factors associated with West Nile virus (WNV) incidence are complex and not well understood. We studied an array of risk factors in and around Atlanta, GA, that have been shown to be linked with WNV in other locations. This array was comprehensive and included climate and meteorological metrics, vegetation characteristics, land use / land cover analyses, and socioeconomic factors. Data on mosquito abundance and WNV mosquito infection rates were obtained for 58 sites and covered 2009-2011, a period following the combined storm water - sewer overflow remediation in that city...
December 2016: Journal of Vector Ecology: Journal of the Society for Vector Ecology
https://www.readbyqxmd.com/read/27853281/solid-state-nmr-reveals-differential-carbohydrate-utilization-in-diapausing-culex-pipiens
#19
James Chang, Jugeshwar Singh, Sungshil Kim, William C Hockaday, Cheolho Sim, Sung Joon Kim
Culex pipiens is the mosquito that vectors West Nile Virus and other human-pathogenic flavivruses in North America. In response to shortened day length and lower temperatures, female Cx. pipiense prepares for the diapause by actively feeding on carbohydrates to increase the biosynthesis of glycogen and lipid to store energy for overwintering. The effect of feeding different carbohydrates on glycogen and lipid biosynthesis in diapausing mosquitoes was investigated in vivo using 13C solid-state NMR. Diapause-destined adult females and nondiapausing counterparts after adult eclosion were fed with three different carbohydrate sources for 7 days: 1) 10% sucrose, 2) 10% D-[(13)C6]glucose, and 3) 1% D-[(13)C6]glucose co-provisioned with 10% sucrose...
November 17, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27849599/yellow-fever-virus-capsid-protein-is-a-potent-suppressor-of-rna-silencing-that-binds-double-stranded-rna
#20
Glady Hazitha Samuel, Michael R Wiley, Atif Badawi, Zach N Adelman, Kevin M Myles
Mosquito-borne flaviviruses, including yellow fever virus (YFV), Zika virus (ZIKV), and West Nile virus (WNV), profoundly affect human health. The successful transmission of these viruses to a human host depends on the pathogen's ability to overcome a potentially sterilizing immune response in the vector mosquito. Similar to other invertebrate animals and plants, the mosquito's RNA silencing pathway comprises its primary antiviral defense. Although a diverse range of plant and insect viruses has been found to encode suppressors of RNA silencing, the mechanisms by which flaviviruses antagonize antiviral small RNA pathways in disease vectors are unknown...
November 29, 2016: Proceedings of the National Academy of Sciences of the United States of America
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