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Hemorrhagic Fever viruses

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https://www.readbyqxmd.com/read/28814703/becoming-an-international-scientist-in-south-korea-ho-wang-lee-s-research-activity-about-epidemic-hemorrhagic-fever
#1
Miyoung Shin
In the 1960-70s, South Korea was still in the position of a science latecomer. Although the scientific research environment in South Korea at that time was insufficient, there was a scientist who achieved outcomes that could be recognized internationally while acting in South Korea. He was Ho Wang Lee(1928~ ) who found Hantann Virus that causes epidemic hemorrhagic fever for the first time in the world. It became a clue to identify causative viruses of hemorrhagic diseases that were scattered here and there throughout the world...
April 2017: Ŭi Sahak
https://www.readbyqxmd.com/read/28804005/performance-assessment-of-the-saps-ii-and-sofa-scoring-systems-in-hanta-virus-hemorrhagic-fever-with-renal-syndrome
#2
Zhenjun Yu, Ni Zhou, Ali Li, Jie Chen, Huazhong Chen, Zebao He, Fei Yan, Haihong Zhao, Jiansheng Zhu
BACKGROUND: Hemorrhagic Fever with Renal Syndrome (HFRS), caused by the hantavirus, is a natural infectious disease characterized by fever, hemorrhage and renal damage. China is the most severely endemic area for HFRS in the world. In recent years, critical scoring systems based on quantitative classification have become an important clinical tool for predicting and evaluating the prognosis of critical illness, and provide guidelines for clinical practice. METHODS: The sample comprised 384 patients with HFRS treated in the Taizhou Hospital from January 2006 to February 2017...
August 10, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28803510/epizootic-hemorrhagic-disease-virus-serotype-6-outbreak-in-israeli-cattle-in-2015
#3
Natalia Golender, Yevgeny Khinich, Anna Gorohov, Itzik Abramovitz, Velizar Bumbarov
In September 2015, a large outbreak caused by epizootic hemorrhagic disease virus (EHDV) was identified in Israeli dairy and beef farms. The main clinical signs were reduced milk production, weakness, drooling, lameness and recumbency, fever, slight erythema of nasal and oral mucosae, weight loss, and abortion. Dyspnea, cachexia, and death were observed less frequently. The clinical diagnosis was confirmed by ELISAs and EHDV-specific real-time reverse transcription PCR (RT-rtPCR), followed by conventional RT-PCR of the VP2 gene and sequence analysis...
August 1, 2017: Journal of Veterinary Diagnostic Investigation
https://www.readbyqxmd.com/read/28797730/an-lasv-gpc-pseudotyped-virus-based-reporter-system-enables-evaluation-of-vaccines-in-mice-under-non-bsl-4-conditions
#4
Qianqian Li, Qiang Liu, Weijin Huang, Jiajing Wu, Jianhui Nie, Meng Wang, Chenyan Zhao, Li Zhang, Youchun Wang
Lassa virus (LASV) causes a severe hemorrhagic fever endemic throughout western Africa. Because of the ability to cause lethal disease in humans, limited treatment options, and potential as a bioweapon, the need for vaccines to prevent LASV epidemic is urgent. However, LASV vaccine development has been hindered by the lack of appropriate small animal models for efficacy evaluation independent of biosafety level four (BSL-4) facilities. Here we generated an LASV-glycoprotein precursor (GPC)-pseudotyped Human immunodeficiency virus containing firefly luciferase (Fluc) reporter gene as surrogate to develop a bioluminescent-imaging-based BALB/c mouse model for one-round infection under non-BSL-4 conditions, in which the bioluminescent intensity of Fluc was utilized as endpoint when evaluating vaccine efficacy...
August 7, 2017: Vaccine
https://www.readbyqxmd.com/read/28794491/ebola-virus-vp24-interacts-with-np-to-facilitate-nucleocapsid-assembly-and-genome-packaging
#5
Logan Banadyga, Thomas Hoenen, Xavier Ambroggio, Eric Dunham, Allison Groseth, Hideki Ebihara
Ebola virus causes devastating hemorrhagic fever outbreaks for which no approved therapeutic exists. The viral nucleocapsid, which is minimally composed of the proteins NP, VP35, and VP24, represents an attractive target for drug development; however, the molecular determinants that govern the interactions and functions of these three proteins are still unknown. Through a series of mutational analyses, in combination with biochemical and bioinformatics approaches, we identified a region on VP24 that was critical for its interaction with NP...
August 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28794043/sorafenib-impedes-rift-valley-fever-virus-egress-by-inhibiting-valosin-containing-protein-function-in-the-cellular-secretory-pathway
#6
Ashwini Brahms, Rajini Mudhasani, Chelsea Pinkham, Krishna Kota, Farooq Nassar, Rouzbeh Zamani, Sina Bavari, Kylene Kehn-Hall
There is an urgent need for therapeutic development to combat Rift Valley fever virus (RVFV) infections, which causes devastating disease in both humans and animals. In an effort to repurpose drugs for RVFV treatment, our previous studies screened a library of FDA-approved drugs. The most promising candidate identified was the hepatocellular and renal cell carcinoma drug, sorafenib. Mechanism of action studies indicated sorafenib targeted a late stage in virus infection and caused a buildup of virions within cells...
August 9, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28791241/ebola-virus-disease-essential-clinical-knowledge
#7
REVIEW
Mahmoud Tawfik Khalafallah, Omar Ali Aboshady, Shaban Ahmed Moawed, Menna Said Ramadan
Since its initial outbreak in 1976, Ebola virus disease (EVD) has affected thousands of people, causing severe illness with high mortality rates. In the absence of a vaccine or effective specific treatment, as well as the lack of early diagnostic and detective methods, the EVD outbreak has generated a significant worldwide health concern. Insufficient health-care system resources, deficient infection control measures, and the shortage of appropriate personal protective equipment acted as amplifiers of the outbreak extension, especially in poorly resourced and unprepared communities...
July 2017: Avicenna Journal of Medicine
https://www.readbyqxmd.com/read/28780738/john-p-craig-md-mph-physician-scientist-educator-and-mentor-1923-2016
#8
M A Haseeb, Pascal James Imperato
John P. Craig (1923-2016) was an eminent physician-scientist, gifted educator, and greatly valued mentor. Born in West Liberty, Ohio on 29 November 1923, he attended Oberlin College, and received his medical degree from Case Western Reserve University, School of Medicine. This was followed by an internship at Yale University Medical Center, and then service in the U.S. Army during the Korean War. He was a battalion surgeon, preventive medicine officer, and epidemiologist. While in Korea, he conducted important investigations of hemorrhagic fever among American troops...
August 5, 2017: Journal of Community Health
https://www.readbyqxmd.com/read/28780425/enhanced-protection-against-experimental-junin-virus-infection-through-the-use-of-a-modified-favipiravir-loading-dose-strategy
#9
Brian B Gowen, Jonna B Westover, Eric J Sefing, Arnaud J Van Wettere, Kevin W Bailey, Luci Wandersee, Takashi Komeno, Yousuke Furuta
A collection of Old and New World arenaviruses are etiologic agents of viral hemorrhagic fever, a syndrome that features hematologic abnormalities, vascular leak, hypovolemia, and multi-organ failure. Treatment is limited to ribavirin for Lassa fever and immune plasma for Argentine hemorrhagic fever. Improved therapeutic options that are safe, more effective and widely available are needed. Here, we show that modification of favipiravir treatment to include a high-dose loading period achieves complete protection in a guinea pig model of Argentine hemorrhagic fever when treatment was initiated two days following challenge with Junin virus (JUNV)...
August 2, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28774342/crimean-congo-hemorrhagic-fever-among-the-one-humped-camel-camelus-dromedaries-in-central-sudan
#10
Hajer M Suliman, Ibrahim A Adam, Shamseldin I Saeed, Sanaa A Abdelaziz, Eltahir M Haroun, Imadeldin E Aradaib
BACKGROUND: Crimean-Congo hemorrhagic fever (CCHF) is a tick-borne viral zoonotic disease caused by Crimean-Congo hemorrhagic fever virus (CCHFV), a member of the genus Nairovirus in the family Bunyaviridae. CCHF is typically asymptomatic in animals but can be highly fatal in humans approaching case fatality rate of approximately 30%. In the present investigation, a cross sectional study was conducted to determine the prevalence of CCHF and to identify the potential risk factors associated with CCHFV seropositivity among the one-humped camel (Camelus dromedaries) in Central Sudan...
August 3, 2017: Virology Journal
https://www.readbyqxmd.com/read/28769016/favipiravir-t-705-a-broad-spectrum-inhibitor-of-viral-rna-polymerase
#11
Yousuke Furuta, Takashi Komeno, Takaaki Nakamura
Favipiravir (T-705; 6-fluoro-3-hydroxy-2-pyrazinecarboxamide) is an anti-viral agent that selectively and potently inhibits the RNA-dependent RNA polymerase (RdRp) of RNA viruses. Favipiravir was discovered through screening chemical library for anti-viral activity against the influenza virus by Toyama Chemical Co., Ltd. Favipiravir undergoes an intracellular phosphoribosylation to be an active form, favipiravir-RTP (favipiravir ribofuranosyl-5'-triphosphate), which is recognized as a substrate by RdRp, and inhibits the RNA polymerase activity...
2017: Proceedings of the Japan Academy. Series B, Physical and Biological Sciences
https://www.readbyqxmd.com/read/28768865/ubiquitin-ligase-wwp1-interacts-with-ebola-virus-vp40-to-regulate-egress
#12
Ziying Han, Cari A Sagum, Fumio Takizawa, Gordon Ruthel, Corbett T Berry, Jing Kong, J Oriol Sunyer, Bruce D Freedman, Mark T Bedford, Sachdev S Sidhu, Marius Sudol, Ronald N Harty
Ebola virus (EBOV) is a member of the Filoviridae family and the cause of hemorrhagic fever outbreaks. The EBOV VP40 (eVP40) matrix protein is the main driving force for virion assembly and budding. Indeed, expression of eVP40 alone in mammalian cells results in the formation and budding of virus-like particles (VLPs), which mimics the budding process and morphology of authentic, infectious EBOV. To complete the budding process, eVP40 utilizes its PPxY L-domain motif to recruit a specific subset of host proteins containing one or more modular WW-domains that then function to facilitate efficient production and release of eVP40 VLPs...
August 2, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28766193/filovirus-research-how-it-began
#13
Werner Slenczka
The first reported filovirus outbreak occurred in August 1967, when laboratory workers in Marburg and Frankfurt, Germany, and Belgrade, Yugoslavia (now Serbia) became infected with an unknown highly pathogenic agent. The disease was characterized by high fever, malaise, rash, hemorrhagic and tetanic manifestations, and high lethality, amounting to 25%. The disease was introduced to Europe by grivets (Chlorocebus aethiops), which were used for biomedical research and vaccine production. The causative agent, Marburg virus, was isolated and identified by scientists of the University of Marburg, Germany in cooperation with specialists for viral electron microscopy at the Bernhard Nocht Institute in Hamburg, Germany...
August 2, 2017: Current Topics in Microbiology and Immunology
https://www.readbyqxmd.com/read/28765218/dengue-virus-infected-dendritic-cells-but-not-monocytes-activate-natural-killer-cells-through-a-contact-dependent-mechanism-involving-adhesion-molecules
#14
Vivian Vasconcelos Costa, Weijian Ye, Qingfeng Chen, Mauro Martins Teixeira, Peter Preiser, Eng Eong Ooi, Jianzhu Chen
Natural killer (NK) cells play a protective role against dengue virus (DENV) infection, but the cellular and molecular mechanisms are not fully understood. Using an optimized humanized mouse model, we show that human NK cells, through the secretion of gamma interferon (IFN-γ), are critical in the early defense against DENV infection. Depletion of NK cells or neutralization of IFN-γ leads to increased viremia and more severe thrombocytopenia and liver damage in humanized mice. In vitro studies using autologous human NK cells show that DENV-infected monocyte-derived dendritic cells (MDDCs), but not monocytes, activate NK cells in a contact-dependent manner, resulting in upregulation of CD69 and CD25 and secretion of IFN-γ...
August 1, 2017: MBio
https://www.readbyqxmd.com/read/28754189/progress-and-works-in-progress-update-on-flavivirus-vaccine-development
#15
REVIEW
Matthew H Collins, Stefan W Metz
Most areas of the globe are endemic for at least one flavivirus, putting billions at risk for infection. This diverse group of viral pathogens causes a range of manifestations in humans from asymptomatic infection to hemorrhagic fever to encephalitis to birth defects and even death. Many flaviviruses are transmitted by mosquitos and have expanded in geographic distribution in recent years, with dengue virus being the most prevalent, infecting approximately 400 million people each year. The explosive emergence of Zika virus in Latin America in 2014 refocused international attention on this medically important group of viruses...
July 25, 2017: Clinical Therapeutics
https://www.readbyqxmd.com/read/28754024/a-comprehensive-review-of-common-bacterial-parasitic-and-viral-zoonoses-at-the-human-animal-interface-in-egypt
#16
REVIEW
Yosra A Helmy, Hosny El-Adawy, Elsayed M Abdelwhab
Egypt has a unique geographical location connecting the three old-world continents Africa, Asia and Europe. It is the country with the highest population density in the Middle East, Northern Africa and the Mediterranean basin. This review summarizes the prevalence, reservoirs, sources of human infection and control regimes of common bacterial, parasitic and viral zoonoses in animals and humans in Egypt. There is a gap of knowledge conerning the epidemiology of zoonotic diseases at the human-animal interface in different localities in Egypt...
July 21, 2017: Pathogens
https://www.readbyqxmd.com/read/28750668/from-hybridomas-to-a-robust-microalgal-based-production-platform-molecular-design-of-a-diatom-secreting-monoclonal-antibodies-directed-against-the-marburg-virus-nucleoprotein
#17
Franziska Hempel, Michael Maurer, Björn Brockmann, Christian Mayer, Nadine Biedenkopf, Anne Kelterbaum, Stephan Becker, Uwe G Maier
BACKGROUND: The ideal protein expression system should provide recombinant proteins in high quality and quantity involving low production costs only. However, especially for complex therapeutic proteins like monoclonal antibodies many challenges remain to meet this goal and up to now production of monoclonal antibodies is very costly and delicate. Particularly, emerging disease outbreaks like Ebola virus in Western Africa in 2014-2016 make it necessary to reevaluate existing production platforms and develop robust and cheap alternatives that are easy to handle...
July 27, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28747170/spatial-prediction-and-validation-of-zoonotic-hazard-through-micro-habitat-properties-where-does-puumala-hantavirus-hole-up
#18
Hussein Khalil, Gert Olsson, Magnus Magnusson, Magnus Evander, Birger Hörnfeldt, Frauke Ecke
BACKGROUND: To predict the risk of infectious diseases originating in wildlife, it is important to identify habitats that allow the co-occurrence of pathogens and their hosts. Puumala hantavirus (PUUV) is a directly-transmitted RNA virus that causes hemorrhagic fever in humans, and is carried and transmitted by the bank vole (Myodes glareolus). In northern Sweden, bank voles undergo 3-4 year population cycles, during which their spatial distribution varies greatly. METHODS: We used boosted regression trees; a technique inspired by machine learning, on a 10 - year time-series (fall 2003-2013) to develop a spatial predictive model assessing seasonal PUUV hazard using micro-habitat variables in a landscape heavily modified by forestry...
July 26, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28736753/combination-of-rt-pcr-and-proteomics-for-the-identification-of-crimean-congo-hemorrhagic-fever-virus-in-ticks
#19
Isabel G Fernández de Mera, Ilias Chaligiannis, Angélica Hernández-Jarguín, Margarita Villar, Lourdes Mateos-Hernández, Anna Papa, Smaragda Sotiraki, Francisco Ruiz-Fons, Alejandro Cabezas-Cruz, Christian Gortázar, José de la Fuente
Crimean-Congo hemorrhagic fever (CCHF) is an emerging tick-borne zoonotic disease caused by the CCHF virus (CCHFV). In this study, an experimental approach combining RT-PCR and proteomics was used for the identification and characterization of CCHFV in 106 ticks from 7 species that were collected from small ruminants in Greece. The methodological approach included an initial screening for CCHFV by RT-PCR followed by proteomics analysis of positive and control negative tick samples. This novel approach allowed the identification of CCHFV-positive ticks and provided additional information to corroborate the RT-PCR findings using a different approach...
July 2017: Heliyon
https://www.readbyqxmd.com/read/28732006/drivers-for-rift-valley-fever-emergence-in-mayotte-a-bayesian-modelling-approach
#20
Raphaëlle Métras, Guillaume Fournié, Laure Dommergues, Anton Camacho, Lisa Cavalerie, Philippe Mérot, Matt J Keeling, Catherine Cêtre-Sossah, Eric Cardinale, W John Edmunds
Rift Valley fever (RVF) is a major zoonotic and arboviral hemorrhagic fever. The conditions leading to RVF epidemics are still unclear, and the relative role of climatic and anthropogenic factors may vary between ecosystems. Here, we estimate the most likely scenario that led to RVF emergence on the island of Mayotte, following the 2006-2007 African epidemic. We developed the first mathematical model for RVF that accounts for climate, animal imports and livestock susceptibility, which is fitted to a 12-years dataset...
July 2017: PLoS Neglected Tropical Diseases
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