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Viral hemorrhagic fever

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https://www.readbyqxmd.com/read/27933051/short-interfering-rna-inhibits-rift-valley-fever-virus-replication-and-degradation-of-protein-kinase-r-in-human-cells
#1
Bonto Faburay, Juergen A Richt
Rift Valley fever virus (RVFV) is a mosquito-borne zoonotic pathogen causing severe outbreaks in humans and livestock in sub-Saharan Africa and the Arabian Peninsula. Human infections are characterized by fever, sometimes leading to encephalitis, retinitis, hemorrhagic fever, and occasionally death. There are currently no fully licensed vaccines or effective therapies for human use. Gene silencing mediated by double-stranded short interfering RNA (siRNA) is a sequence-specific, highly conserved mechanism in eukaryotes, which serves as an antiviral defense mechanism...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27929218/emerging-vector-borne-diseases
#2
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/27915438/variations-in-clinical-presentation-and-anatomical-distribution-of-gross-lesions-of-african-swine-fever-in-domestic-pigs-in-the-southern-highlands-of-tanzania-a-field-experience
#3
Maulilio John Kipanyula, Solomon Wilson Nong'ona
African swine fever is a contagious viral disease responsible for up to 100% mortality among domestic pigs. A longitudinal study was carried out to determine the clinical presentation and anatomical distribution of gross lesions in affected pigs in Mbeya region, Tanzania during the 2010 to 2014 outbreaks. Data were collected during clinical and postmortem examination by field veterinarians and using a structured questionnaire. A total of 118 respondents (100%) showed awareness about African swine fever. During previous outbreaks, the mortality rate was almost 100%, while in 2014 it was estimated to be less than 50%...
December 3, 2016: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/27899121/meta-analysis-of-the-clinical-and-laboratory-parameters-of-sfts-patients-in-china
#4
Miao-Miao Liu, Xiao-Ying Lei, Xue-Jie Yu
BACKGROUND: Severe fever with thrombocytopenia syndrome (SFTS) is an emerging hemorrhagic fever in East Asia, which is caused by a novel bunyavirus-SFTSV. Many studies have reported the clinical characters of SFTS patients, but the reports were not consistent and a systematic summary of clinical manifestations and laboratory parameters are not available. METHOD: A comprehensive literature research of Web of Science, PubMed, Wan Fang Data, and Chinese National Knowledge Infrastructure databases was conducted on articles which have described the clinical characters of SFTS patients...
November 29, 2016: Virology Journal
https://www.readbyqxmd.com/read/27895275/sequence-independent-single-primer-amplification-next-generation-sequencing-of-hantaan-virus-cell-culture-based-isolates
#5
Dong Hyun Song, Won-Keun Kim, Se Hun Gu, Daesang Lee, Jeong-Ah Kim, Jin Sun No, Seung-Ho Lee, Michael R Wiley, Gustavo Palacios, Jin-Won Song, Seong Tae Jeong
Hantaan virus (HTNV), identified in the striped field mouse (Apodemus agrarius), belongs to the hantavirus genus of the Bunyaviridae family and contains tripartite RNA genomes, small (S), medium (M), and large (L) segments. HTNV is a major causative for hemorrhagic fever with renal syndrome (HFRS) with fatality rates ranging from 1% to 15% in the Republic of Korea (ROK) and China. Defining of HTNV whole-genome sequences and isolation of the infectious particle play a critical role in the characterization and preventive and therapeutic strategies of hantavirus outbreaks...
November 28, 2016: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/27881138/bohv-4-based-vector-delivering-ebola-virus-surface-glycoprotein
#6
Alfonso Rosamilia, Sarah Jacca, Giulia Tebaldi, Silvia Tiberti, Valentina Franceschi, Francesca Macchi, Sandro Cavirani, Gary Kobinger, Donald P Knowles, Gaetano Donofrio
BACKGROUND: Ebola virus (EBOV) is a Category A pathogen that is a member of Filoviridae family that causes hemorrhagic fever in humans and non-human primates. Unpredictable and devastating outbreaks of disease have recently occurred in Africa and current immunoprophylaxis and therapies are limited. The main limitation of working with pathogens like EBOV is the need for costly containment. To potentiate further and wider opportunity for EBOV prophylactics and therapies development, innovative approaches are necessary...
November 24, 2016: Journal of Translational Medicine
https://www.readbyqxmd.com/read/27880794/phylogeography-of-crimean-congo-hemorrhagic-fever-virus
#7
Alexander N Lukashev, Alexander S Klimentov, Svetlana E Smirnova, Tamara K Dzagurova, Jan Felix Drexler, Anatoly P Gmyl
Crimean Congo hemorrhagic fever virus (CCHFV) is one of the most severe viral zoonozes. It is prevalent throughout Africa, Asia and southern Europe. Limited availability of sequence data has hindered phylogeographic studies. The complete genomic sequence of all three segments of 14 Crimean Congo hemorrhagic fever virus strains isolated from 1958-2000 in Russia, Central Asia and Africa was identified. Each genomic segment was independently subjected to continuous Bayesian phylogeographic analysis. The origin of each genomic segment was traced to Africa about 1,000-5,000 years ago...
2016: PloS One
https://www.readbyqxmd.com/read/27880744/notice-to-readers-final-2015-reports-of-nationally-notifiable-infectious-diseases-and-conditions
#8
(no author information available yet)
The table listed in this report on pages 1307-1321 presents finalized data, as of June 30, 2016, from the National Notifiable Diseases Surveillance System (NNDSS) for 2015. These data will be published in more detail in the Summary of Notifiable Infectious Diseases and Conditions - United States, 2015 (1). Because no cases were reported in the United States during 2015, the following diseases do not appear in this early release table: anthrax; dengue hemorrhagic fever; diphtheria; eastern equine encephalitis virus disease, nonneuroinvasive; poliomyelitis, paralytic; poliovirus infection, nonparalytic; severe acute respiratory syndrome-associated coronavirus disease (SARS-CoV); smallpox; western equine encephalitis virus disease, neuroinvasive and nonneuroinvasive; yellow fever; and viral hemorrhagic fevers...
November 25, 2016: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/27878461/crimean-congo-hemorrhagic-fever-among-children-in-iran
#9
Dalileh Aslani, Mostafa Salehi-Vaziri, Vahid Baniasadi, Tahmineh Jalali, Sanam Azad-Manjiri, Tahereh Mohammadi, Sahar Khakifirouz, Mehdi Fazlalipour
Crimean-Congo hemorrhagic fever (CCHF) is a viral zoonotic disease which is endemic in Iran. The etiological agent of CCHF is an RNA virus belonging to the genus Nairovirus of the family Bunyaviridae. CCHF virus (CCHFV) can be transmitted to humans through bites from infected ticks and direct contact with infected blood or tissues. Although the disease has been observed in different age groups, the rate of disease is lower in children and elderly. This study was designed to characterize CCHFV-infected children in Iran...
November 22, 2016: Archives of Virology
https://www.readbyqxmd.com/read/27872619/ebola-vp40-in-exosomes-can-cause-immune-cell-dysfunction
#10
Michelle L Pleet, Allison Mathiesen, Catherine DeMarino, Yao A Akpamagbo, Robert A Barclay, Angela Schwab, Sergey Iordanskiy, Gavin C Sampey, Benjamin Lepene, Sergei Nekhai, M J Aman, Fatah Kashanchi
Ebola virus (EBOV) is an enveloped, ssRNA virus from the family Filoviridae capable of causing severe hemorrhagic fever with up to 80-90% mortality rates. The most recent outbreak of EBOV in West Africa starting in 2014 resulted in over 11,300 deaths; however, long-lasting persistence and recurrence in survivors has been documented, potentially leading to further transmission of the virus. We have previously shown that exosomes from cells infected with HIV-1, HTLV-1 and Rift Valley Fever virus are able to transfer viral proteins and non-coding RNAs to naïve recipient cells, resulting in an altered cellular activity...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27866774/complement-independent-dengue-virus-type-1-infection-enhancing-antibody-reduces-complement-dependent-and-independent-neutralizing-antibody-activity
#11
Atsushi Yamanaka, Eiji Konishi
Dengue fever and dengue hemorrhagic fever are globally important mosquito-transmitted viral diseases. However, the only licensed vaccine is not highly protective. Viremia is related to disease severity in infected humans, and it is thought to be reduced by neutralizing antibodies but increased by infection-enhancing antibodies. We established an assay system to measure the balance between neutralizing and enhancing antibodies and found that most dengue-immune individuals in endemic areas carry complement-independent enhancing antibodies (CiEAb)...
December 12, 2016: Vaccine
https://www.readbyqxmd.com/read/27855284/development-of-live-attenuated-arenavirus-vaccines-based-on-codon-deoptimization-of-the-viral-glycoprotein
#12
Benson Y H Cheng, Aitor Nogales, Juan Carlos de la Torre, Luis Martínez-Sobrido
Several arenaviruses, chiefly Lassa (LASV) in West Africa, cause hemorrhagic fever (HF) disease in humans and pose important public health problems in their endemic regions. To date, there are no FDA-approved arenavirus vaccines and current anti-arenaviral therapy is limited to the use of ribavirin that has very limited efficacy. In this work we document that a recombinant prototypic arenavirus lymphocytic choriomeningitis virus (LCMV) with a codon deoptimized (CD) surface glycoprotein (GP), rLCMV/CD, exhibited wild type (WT)-like growth properties in cultured cells despite barely detectable GP expression levels in rLCMV/CD-infected cells...
November 14, 2016: Virology
https://www.readbyqxmd.com/read/27853993/the-roles-of-ebolavirus-glycoproteins-in-viral-pathogenesis
#13
REVIEW
Yun-Jia Ning, Fei Deng, Zhihong Hu, Hualin Wang
Ebolaviruses are highly dangerous pathogens exhibiting extreme virulence in humans and nonhuman primates. The majority of ebolavirus species, most notably Zaire ebolavirus, can cause Ebola virus disease (EVD), formerly known as Ebola hemorrhagic fever, in humans. EVD is associated with case-fatality rates as high as 90%, and there is currently no specific treatment or licensed vaccine available against EVD. Understanding the molecular biology and pathogenesis of ebolaviruses is important for the development of antiviral therapeutics...
November 14, 2016: Virologica Sinica
https://www.readbyqxmd.com/read/27853992/progress-towards-understanding-the-pathogenesis-of-dengue-hemorrhagic-fever
#14
REVIEW
Xiaojing Pang, Rudian Zhang, Gong Cheng
Dengue virus (DENV) is a mosquito-borne virus belonging to the Flaviviridae family. There are 4 serotypes of DENV that cause human disease through transmission by mosquito vectors. DENV infection results in a broad spectrum of clinical symptoms, ranging from mild fever to dengue hemorrhagic fever (DHF), the latter of which can progress to dengue shock syndrome (DSS) and death. Researchers have made unremitting efforts over the last half-century to understand DHF pathogenesis. DHF is probably caused by multiple factors, such as virus-specific antibodies, viral antigens and host immune responses...
November 14, 2016: Virologica Sinica
https://www.readbyqxmd.com/read/27847619/central-retinal-vein-occlusion-concomitant-with-dengue-fever
#15
Punithamalar Velaitham, Nandini Vijayasingham
BACKGROUND: Dengue virus infection is on the rise and there is increasing number of ocular complications that are being reported. Most common ocular complications are macular edema, macular hemorrhages, and foveolitis. There are case reports on branch retinal vessel occlusions. Most of the ocular complications are attributed to the bleeding tendency and transudative process in dengue viral infection. This is a case report of ischemic central retinal vein occlusion (CRVO) concomitant with dengue fever...
2016: International Journal of Retina and Vitreous
https://www.readbyqxmd.com/read/27818861/thorax-ct-findings-in-patients-with-crimean-congo-hemorrhagic-fever-cchf
#16
Turan Aktaş, Fatma Aktaş, Zafer Özmen, Ayşegül Altunkaş, Turan Kaya, Osman Demir
PURPOSE: Crimean-Congo hemorrhagic fever (CCHF) is a zoonotic viral disease with high mortality. The agent causing CCHF is a Nairovirus. The virus is typically transmitted to humans through tick bites. CCHF is a life-threatening disease observed endemically over a wide geographical regions in the world and a little known about pulmonary findings in CCHF patients. METHODS: The patients that were admitted and diagnosed with CCHF between April 2010 and September 2015 were examined...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27811840/notes-from-the-field-rift-valley-fever-response-kabale-district-uganda-march-2016
#17
Annabelle de St Maurice, Luke Nyakarahuka, Lawrence Purpura, Elizabeth Ervin, Alex Tumusiime, Stephen Balinandi, Jackson Kayondo, Sophia Mulei, Anne Marion Namutebi, Patrick Tusiime, Steven Wiersma, Stuart Nichol, Pierre Rollin, John Klena, Barbara Knust, Trevor Shoemaker
On March 9, 2016, a male butcher from Kabale District, Uganda, aged 45 years, reported to the Kabale Regional Referral Hospital with fever, fatigue, and headache associated with black tarry stools and bleeding from the nose. One day later, a student aged 16 years from a different sub-county in Kabale District developed similar symptoms and was admitted to the same hospital. The student also had a history of contact with livestock. Blood specimens collected from both patients were sent for testing for Marburg virus disease, Ebola virus disease, Rift Valley fever (RVF), and Crimean Congo Hemorrhagic fever at the Uganda Virus Research Institute, as part of the viral hemorrhagic fevers surveillance program...
November 4, 2016: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/27795340/comparison-of-magpix%C3%A2-%C3%A2-assays-and-elisa-for-the-detection-of-hemorrhagic-fever-viruses
#18
Neal G Satterly, Matthew A Voorhees, Abbe D Ames, Randal J Schoepp
Viral hemorrhagic fevers with their high mortality rates, lack of medical countermeasures, and potential use as instruments of bioterrorism, pose a significant threat to the developed and the developing areas of the world. The key to preventing the spread of these diseases is early and accurate detection. For decades, the gold-standard immunoassay for hemorrhagic fever detection has been the ELISA; however newer technologies are emerging with increased sensitivity. One such technology is the Luminex MAGPIX®™ platform using XMAP® microspheres...
October 19, 2016: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/27783711/mechanistic-insight-into-bunyavirus-induced-membrane-fusion-from-structure-function-analyses-of-the-hantavirus-envelope-glycoprotein-gc
#19
Pablo Guardado-Calvo, Eduardo A Bignon, Eva Stettner, Scott Allen Jeffers, Jimena Pérez-Vargas, Gerard Pehau-Arnaudet, M Alejandra Tortorici, Jean-Luc Jestin, Patrick England, Nicole D Tischler, Félix A Rey
Hantaviruses are zoonotic viruses transmitted to humans by persistently infected rodents, giving rise to serious outbreaks of hemorrhagic fever with renal syndrome (HFRS) or of hantavirus pulmonary syndrome (HPS), depending on the virus, which are associated with high case fatality rates. There is only limited knowledge about the organization of the viral particles and in particular, about the hantavirus membrane fusion glycoprotein Gc, the function of which is essential for virus entry. We describe here the X-ray structures of Gc from Hantaan virus, the type species hantavirus and responsible for HFRS, both in its neutral pH, monomeric pre-fusion conformation, and in its acidic pH, trimeric post-fusion form...
October 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27775001/transstadial-transmission-and-long-term-association-of-crimean-congo-hemorrhagic-fever-virus-in-ticks-shapes-genome-plasticity
#20
Han Xia, Andrew S Beck, Aysen Gargili, Naomi Forrester, Alan D T Barrett, Dennis A Bente
The trade-off hypothesis, the current paradigm of arbovirus evolution, proposes that cycling between vertebrate and invertebrate hosts presents significant constraints on genetic change of arboviruses. Studying these constraints in mosquito-borne viruses has led to a new understanding of epizootics. The trade-off hypothesis is assumed to be applicable to tick-borne viruses too, although studies are lacking. Tick-borne Crimean-Congo hemorrhagic fever virus (CCHFV), a member of the family Bunyaviridae, is a major cause of severe human disease worldwide and shows an extraordinary amount of genetic diversity compared to other arboviruses, which has been linked to increased virulence and emergence in new environments...
October 24, 2016: Scientific Reports
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