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https://www.readbyqxmd.com/read/28077444/protein-interactions-during-the-flavivirus-and-hepacivirus-life-cycle
#1
Gisa Gerold, Janina Bruening, Bettina Weigel, Thomas Pietschmann
Protein-protein interactions govern biological functions in cells, in the extracellular milieu and at the border between cells and extracellular space. Viruses are small intracellular parasites and thus rely on protein interactions to produce progeny inside host cells and to spread from cell to cell. Usage of host proteins by viruses can have severe consequences e.g. apoptosis, metabolic disequilibria or altered cell proliferation and mobility. Understanding protein interactions during virus infection can thus educate us on viral infection and pathogenesis mechanisms...
January 11, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/28032207/vector-borne-pathogen-and-host-evolution-in-a-structured-immuno-epidemiological-system
#2
Hayriye Gulbudak, Vincent L Cannataro, Necibe Tuncer, Maia Martcheva
Vector-borne disease transmission is a common dissemination mode used by many pathogens to spread in a host population. Similar to directly transmitted diseases, the within-host interaction of a vector-borne pathogen and a host's immune system influences the pathogen's transmission potential between hosts via vectors. Yet there are few theoretical studies on virulence-transmission trade-offs and evolution in vector-borne pathogen-host systems. Here, we consider an immuno-epidemiological model that links the within-host dynamics to between-host circulation of a vector-borne disease...
December 28, 2016: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/28006649/serodiagnosis-of-zika-virus-zikv-infections-by-a-novel-ns1-based-elisa-devoid-of-cross-reactivity-with-dengue-virus-antibodies-a-multicohort-study-of-assay-performance-2015-to-2016
#3
Katja Steinhagen, Christian Probst, Christiane Radzimski, Jonas Schmidt-Chanasit, Petra Emmerich, Marjan van Esbroeck, Janke Schinkel, Martin P Grobusch, Abraham Goorhuis, Jens M Warnecke, Erik Lattwein, Lars Komorowski, Andrea Deerberg, Sandra Saschenbrecker, Winfried Stöcker, Wolfgang Schlumberger
Serological diagnosis of Zika virus (ZIKV) infections is challenging due to high cross-reactivity between flaviviruses. We evaluated the diagnostic performance of a novel anti-ZIKV ELISA based on recombinant ZIKV non-structural protein 1 (NS1). Assay sensitivity was examined using sera from 27 patients with reverse transcription (RT)-PCR-confirmed and 85 with suspected ZIKV infection. Specificity was analysed using sera from 1,015 healthy individuals. Samples from 252 patients with dengue virus (n = 93), West Nile virus (n = 34), Japanese encephalitis virus (n = 25), chikungunya virus (n = 19) or Plasmodium spp...
December 15, 2016: Euro Surveillance: Bulletin Européen sur les Maladies Transmissibles, European Communicable Disease Bulletin
https://www.readbyqxmd.com/read/27993855/obatoclax-inhibits-alphavirus-membrane-fusion-by-neutralizing-the-acidic-environment-of-endocytic-compartments
#4
Finny S Varghese, Kai Rausalu, Marika Hakanen, Sirle Saul, Beate M Kümmerer, Petri Susi, Andres Merits, Tero Ahola
As new pathogenic viruses continue to emerge, it is paramount to have intervention strategies that target a common denominator in these pathogens. The fusion of viral and cellular membranes during viral entry is one such process that is used by many pathogenic viruses including chikungunya virus, West Nile virus, influenza virus etc. Obatoclax, a small-molecule antagonist of the Bcl-2 family of proteins was previously determined to be antiviral against influenza A virus and also Sindbis virus. Here, we report it to be active against alphaviruses like chikungunya virus (EC50 = 0...
December 19, 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27986090/first-report-of-l1014f-kdr-mutation-in-culex-pipiens-complex-from-morocco
#5
Meriem Bkhache, Fatim-Zohra Tmimi, Omar Charafeddine, Chafika Faraj, Anna-Bella Failloux, M'hammed Sarih
BACKGROUND: Mosquitoes of the Culex pipiens complex, competent vectors for West Nile virus (WNV) and Rift Valley fever virus (RVFV) are widely targeted by insecticide treatments. The intensive application of chemical insecticides led to the development of resistance in many insects including Culex pipiens mosquitoes. The absence of data on resistance mechanisms in Morocco allow us to assess the levels of lambda-cyhalothrin resistance and the frequency of the mutated gene L1014F kdr in different forms of Cx...
December 16, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27977670/serological-evidence-of-contrasted-exposure-to-arboviral-infections-between-islands-of-the-union-of-comoros-indian-ocean
#6
Koussay Dellagi, Nicolas Salez, Marianne Maquart, Sophie Larrieu, Amina Yssouf, Rahamatou Silaï, Isabelle Leparc-Goffart, Pablo Tortosa, Xavier de Lamballerie
A cross sectional serological survey of arboviral infections in humans was conducted on the three islands of the Union of Comoros, Indian Ocean, in order to test a previously suggested contrasted exposure of the three neighboring islands to arthropod-borne epidemics. Four hundred human sera were collected on Ngazidja (Grande Comore), Mwali (Mohéli) and Ndzouani (Anjouan), and were tested by ELISA for IgM and/or IgG antibodies to Dengue (DENV), Chikungunya (CHIKV), Rift Valley fever (RVFV), West Nile (WNV), Tick borne encephalitis (TBEV) and Yellow fever (YFV) viruses and for neutralizing antibodies to DENV serotypes 1-4...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27936448/flavivirus-transmission-focusing-on-zika
#7
REVIEW
Nikos Vasilakis, Scott C Weaver
Flaviviruses are among the most diverse viruses with over 85 species recognized. Taxonomically, this genus is one of the 4 recognized genera within the family Flaviviridae. Most flaviviruses of human public health significance, for example, dengue, yellow fever and Zika viruses, are arthropod-borne (arboviruses) and have two evolutionarily and ecologically distinct transmission cycles: a sylvatic transmission cycle, where the virus circulates between zoonotic vertebrate reservoir and amplification hosts and arboreal mosquitoes; and an urban transmission cycle, where the virus circulates between humans and peridomestic Aedes spp...
December 6, 2016: Current Opinion in Virology
https://www.readbyqxmd.com/read/27933090/the-worldwide-spread-of-the-tiger-mosquito-as-revealed-by-mitogenome-haplogroup-diversity
#8
Vincenza Battaglia, Paolo Gabrieli, Stefania Brandini, Marco R Capodiferro, Pio A Javier, Xiao-Guang Chen, Alessandro Achilli, Ornella Semino, Ludvik M Gomulski, Anna R Malacrida, Giuliano Gasperi, Antonio Torroni, Anna Olivieri
In the last 40 years, the Asian tiger mosquito Aedes albopictus, indigenous to East Asia, has colonized every continent except Antarctica. Its spread is a major public health concern, given that this species is a competent vector for numerous arboviruses, including those causing dengue, chikungunya, West Nile, and the recently emerged Zika fever. To acquire more information on the ancestral source(s) of adventive populations and the overall diffusion process from its native range, we analyzed the mitogenome variation of 27 individuals from representative populations of Asia, the Americas, and Europe...
2016: Frontiers in Genetics
https://www.readbyqxmd.com/read/27929218/emerging-vector-borne-diseases
#9
Mark K Huntington, Jay Allison, Dilip Nair
Several mosquito-borne viral infections have recently emerged in North America; West Nile virus is the most common in the United States. Although West Nile virus generally causes a self-limited, flulike febrile illness, a serious neuroinvasive form may occur. Dengue is the most common vector-borne viral disease worldwide, and it has been a significant public health threat in the United States since 2009. Known as breakbone fever for its severe myalgias and arthralgias, dengue may cause a hemorrhagic syndrome...
October 1, 2016: American Family Physician
https://www.readbyqxmd.com/read/27928533/mosquito-surveillance-and-the-first-record-of-the-invasive-mosquito-species-aedes-stegomyia-albopictus-skuse-diptera-culicidae-in-southern-iran
#10
Sara Doosti, Mohammad Reza Yaghoobi-Ershadi, Francis Schaffner, Seyed Hassan Moosa-Kazemi, Kamran Akbarzadeh, Mohammad Mehdi Gooya, Hassan Vatandoost, Mohammad Reza Shirzadi, Ehsan Mosta-Favi
BACKGROUND: Epidemics of mosquito-borne viral infections such as dengue, chikungunya, West Nile and Rift Valley fevers in neighbouring countries and risk of introduction of exotic vectors into Iran have placed this country at a significant risk for these mosquito-borne diseases. METHODS: After the first dengue case reported in Iran in 2008, active entomological surveillance of Aedes albopictus (Skuse) and Ae. aegypti (Linnaeus) were conducted in May/Jun, Sep, and Oct/Nov, 2008-2014...
August 2016: Iranian Journal of Public Health
https://www.readbyqxmd.com/read/27928094/seroconversion-to-causes-of-febrile-illness-in-mongolian-peacekeepers-deployed-to-south-sudan
#11
Altangerel Enkhtsetseg, Rendoo Davadoorj, Stefan Fernandez, Duangrat Mongkolsirichaikul, Damdin Altantuul, Erdene Elbegdorj, Lkhagvasuren Ganchimeg, Samuel L Yingst
Immediately before deployment (Fall 2012) and after deployment (Spring 2013) in support of United Nations peacekeeping operations, Mongolian Armed Forces medical personnel obtained serum samples from the first contingent of Mongolian peacekeepers deploying to South Sudan to monitor serologic evidence of exposure to diseases that cause acute febrile illness. A total of 632 paired samples were tested for IgG antibody for the following (number of seroconversions in parentheses): Rickettsia (spotted fever and typhus groups) (25), West Nile fever virus (WNV) (23), Coxiella burnetii (causative agent of Q fever) (12), dengue virus (8), leptospirosis (6), chikungunya virus (0), Congo-Crimean hemorrhagic fever virus (0), Japanese encephalitis virus (0), and Rift Valley fever virus (0)...
December 7, 2016: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/27881079/detection-of-west-nile-virus-in-wild-birds-in-tana-river-and-garissa-counties-kenya
#12
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/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/27849599/yellow-fever-virus-capsid-protein-is-a-potent-suppressor-of-rna-silencing-that-binds-double-stranded-rna
#14
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
https://www.readbyqxmd.com/read/27849515/review-of-west-nile-virus-circulation-and-outbreak-risk-in-madagascar-entomological-and-ornithological-perspectives
#15
Michaël Luciano Tantely, Steven M Goodman, Tsirinaina Rakotondranaivo, Sébastien Boyer
West Nile fever (WNF) is a zoonotic disease, occurring nearly globally. In Madagascar, West Nile virus (WNV) was first detected in 1978 from wild birds and the virus is currently distributed across the island, but no epidemic or epizootic period has been recorded. One fatal human case of WNV infection was reported in 2011, suggesting a "tip of the iceberg" phenomenon of a possible WNF epidemic/epizootic on the island. The main objective of this literature-based survey is to review patterns of WNV circulation in Madagascar from the entomological and ornithological points of view...
2016: Parasite: Journal de la Société Française de Parasitologie
https://www.readbyqxmd.com/read/27834337/a-novel-indirect-elisa-for-diagnosis-of-dengue-fever
#16
Rohan Narayan, Senthil Raja, Senthil Kumar, Mohana Sambasivam, Raja Jagadeesan, Kavita Arunagiri, Kaveri Krishnasamy, Gunasekaran Palani
BACKGROUND & OBJECTIVES: Dengue fever (DF) is associated with significant morbidity and mortality in the tropical and sub-tropical regions of the world. Since there are no effective antiviral drugs for treatment, clinicians often rely on the accurate diagnosis of dengue fever to begin supportive therapy at early stages of the illness. The objective of this study was to develop an in-house dengue virus serotype 2 (DENV-2) non-structural protein- 5 (NS5) based indirect ELISA. METHODS: DENV-2 was raised in Vero cells and the viral proteins were separated and subsequently the NS5 protein was eluted...
July 2016: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/27824100/identification-of-a-new-broadly-cross-reactive-epitope-within-domain-iii-of-the-duck-tembusu-virus-e-protein
#17
Chenxi Li, Xiaofei Bai, Runze Meng, Wulin Shaozhou, Qingshan Zhang, Ronghong Hua, Jyung-Hurng Liu, Ming Liu, Yun Zhang
In 2010, a pathogenic flavivirus termed duck Tembusu virus (DTMUV) caused widespread outbreak of egg-drop syndrome in domesticated ducks in China. Although the glycoprotein E of DTMUV is an important structural component of the virus, the B-cell epitopes of this protein remains uncharacterized. Using phage display and mutagenesis, we identified a minimal B-cell epitope, (374)EXE/DPPFG(380), that mediates binding to a nonneutralizing monoclonal antibody. DTMUV-positive duck serum reacted with the epitope, and amino acid substitutions revealed the specific amino acids that are essential for antibody binding...
November 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27814732/detection-of-dengue-virus-serotypes-1-2-and-3-in-selected-regions-of-kenya-2011-2014
#18
Limbaso Konongoi, Victor Ofula, Albert Nyunja, Samuel Owaka, Hellen Koka, Albina Makio, Edith Koskei, Fredrick Eyase, Daniel Langat, Randal J Schoepp, Cynthia Ann Rossi, Ian Njeru, Rodney Coldren, Rosemary Sang
BACKGROUND: Dengue fever, a mosquito-borne disease, is associated with illness of varying severity in countries in the tropics and sub tropics. Dengue cases continue to be detected more frequently and its geographic range continues to expand. We report the largest documented laboratory confirmed circulation of dengue virus in parts of Kenya since 1982. METHODS: From September 2011 to December 2014, 868 samples from febrile patients were received from hospitals in Nairobi, northern and coastal Kenya...
November 4, 2016: Virology Journal
https://www.readbyqxmd.com/read/27812357/emergence-and-spreading-potential-of-zika-virus
#19
REVIEW
Álvaro Fajardo, Juan Cristina, Pilar Moreno
Zika virus (ZIKV) is an arthropod-borne Flavivirus (family Flaviviridae) closely related to dengue, yellow fever and West Nile viruses. ZIKV remained neglected, confined to enzootic transmission cycles in Africa and Asia, until the first significant outbreak was reported in Micronesia in 2007. Subsequent epidemics of growing incidence occurred in French Polynesia and other South Pacific Islands, and recently, in the Americas. The latter and currently ongoing outbreak of unprecedented incidence revealed the association of ZIKV infection with the occurrence of severe congenital malformations and neurological diseases, leading to a widespread concern about its potential to pose a global public health threat...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27800692/waiting-in-the-wings-the-potential-of-mosquito-transmitted-flaviviruses-to-emerge
#20
Duncan R Smith
The sudden dramatic emergence of the mosquito transmitted flavivirus Zika virus has bought to the world's attention a relatively obscure virus that was previously only known to specialist researchers. The genus Flavivirus of the family Flaviviridae contains a number of well-known mosquito transmitted human pathogenic viruses including the dengue, yellow fever, Japanese encephalitis and West Nile viruses. However, the genus also contains a number of lesser known human pathogenic viruses transmitted by mosquitoes including Wesselsbron virus, Ilheus virus, St...
November 1, 2016: Critical Reviews in Microbiology
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