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https://www.readbyqxmd.com/read/27910909/the-disinfection-characteristics-of-ebola-virus-outbreak-variants
#1
Bradley W M Cook, Todd A Cutts, Aidan M Nikiforuk, Anders Leung, Darwyn Kobasa, Steven S Theriault
The recent Ebola virus outbreak in West Africa has forced experts to re-evaluate their understanding of how to best disinfect areas contaminated with infectious bodily fluids. Recent research has found that Ebola virus remains viable in blood for 7-10 days making appropriate disinfection crucial to infection control. We sought to determine if the three most important outbreak variants of Zaire ebolavirus (Mayinga, Kikwit and Makona) exhibit separate phenotypes when challenged with a range of sodium hypochlorite (NaOCl) concentrations or 70% ethanol (EtOH) at average West African temperature...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27902321/the-serology-of-ebolavirus-a-wider-geographical-range-a-wider-genus-of-viruses-or-a-wider-range-of-virulence
#2
Magdalena Formella, Derek Gatherer
Viruses of the genus Ebolavirus are the causative agents of Ebola virus disease (EVD), of which there have been only 25 recorded outbreaks since the discovery of Zaire and Sudan ebolaviruses in the late 1970s. Until the west African outbreak commencing in late 2013, EVD was confined to an area of central Africa stretching from the coast of Gabon through the Congo river basin and eastward to the Great Lakes. Nevertheless, population serological studies since 1976, most of which were carried out in the first two decades after that date, have suggested a wider distribution and more frequent occurrence across tropical Africa...
October 21, 2016: Journal of General Virology
https://www.readbyqxmd.com/read/27887599/how-severe-and-prevalent-are-ebola-and-marburg-viruses-a-systematic-review-and-meta-analysis-of-the-case-fatality-rates-and-seroprevalence
#3
Luke Nyakarahuka, Clovice Kankya, Randi Krontveit, Benjamin Mayer, Frank N Mwiine, Julius Lutwama, Eystein Skjerve
BACKGROUND: Ebola and Marburg virus diseases are said to occur at a low prevalence, but are very severe diseases with high lethalities. The fatality rates reported in different outbreaks ranged from 24-100%. In addition, sero-surveys conducted have shown different seropositivity for both Ebola and Marburg viruses. We aimed to use a meta-analysis approach to estimate the case fatality and seroprevalence rates of these filoviruses, providing vital information for epidemic response and preparedness in countries affected by these diseases...
November 25, 2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27853993/the-roles-of-ebolavirus-glycoproteins-in-viral-pathogenesis
#4
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/27846221/minimally-symptomatic-infection-in-an-ebola-hotspot-a-cross-sectional-serosurvey
#5
Eugene T Richardson, J Daniel Kelly, Mohamed Bailor Barrie, Annelies W Mesman, Sahr Karku, Komba Quiwa, Regan H Marsh, Songor Koedoyoma, Fodei Daboh, Kathryn P Barron, Michael Grady, Elizabeth Tucker, Kerry L Dierberg, George W Rutherford, Michele Barry, James Holland Jones, Megan B Murray, Paul E Farmer
INTRODUCTION: Evidence for minimally symptomatic Ebola virus (EBOV) infection is limited. During the 2013-16 outbreak in West Africa, it was not considered epidemiologically relevant to published models or projections of intervention effects. In order to improve our understanding of the transmission dynamics of EBOV in humans, we investigated the occurrence of minimally symptomatic EBOV infection in quarantined contacts of reported Ebola virus disease cases in a recognized 'hotspot.' METHODOLOGY/PRINCIPAL FINDINGS: We conducted a cross-sectional serosurvey in Sukudu, Kono District, Sierra Leone, from October 2015 to January 2016...
November 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27795350/development-of-a-sensitive-and-specific-serological-assay-based-on-the-luminex-technology-for-the-detection-of-antibodies-to-zaire-ebola-virus-ebov
#6
Ahidjo Ayouba, Abdoulaye Touré, Christelle Butel, Alpha Kabinet Keita, Florian Binetruy, Mamadou S Sow, Vincent Foulongne, Eric Delaporte, Martine Peeters
The recent Ebola virus outbreak in West Africa illustrates clearly the need for additional studies in humans and animals to elucidate the ecology of Ebola viruses. Here we developed a serological assay based on the Luminex technology. Nine recombinant proteins representing different viral regions (NP, VP40 and GP) from four of the five EBV lineages were used. Samples from 94 survivors of the EBOV outbreak in Guinea and negative samples from 108 patients in France were used to calculate test performance for EBOV detection and cross-reaction with other Ebola virus lineages...
October 26, 2016: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/27795234/complete-genome-sequence-of-an-ebola-virus-isolate-imported-from-sierra-leone-to-germany-determined-by-circle-sequencing
#7
Jan Philipp Mengel, Artur Lissin, Nadine Biedenkopf, Tilman Schultze, Gopala Krishna Mannala, Gordian Schudt, Gerrit Kann, Timo Wolf, Markus Eickmann, Stephan Becker, Franz Cemic, Torsten Hain
We report here a complete genome sequence of Ebola virus Makona from a nonfatal patient sample that originated in Sierra Leone during the last Ebola virus outbreak in West Africa (species Zaire ebolavirus) using a highly accurate circle sequencing (Cir-seq) method.
October 6, 2016: Genome Announcements
https://www.readbyqxmd.com/read/27767073/the-2014-ebola-virus-outbreak-in-west-africa-highlights-no-evidence-of-rapid-evolution-or-adaptation-to-humans
#8
Xingguang Li, Junjie Zai, Haizhou Liu, Yi Feng, Fan Li, Jing Wei, Sen Zou, Zhiming Yuan, Yiming Shao
Following its immergence in December 2013, the recent Zaire Ebola virus (EBOV) outbreak in West Africa has spread and persisted for more than two years, making it the largest EBOV epidemic in both scale and geographical region to date. In this study, a total of 726 glycoprotein (GP) gene sequences of the EBOV full-length genome obtained from West Africa from the 2014 outbreak, combined with 30 from earlier outbreaks between 1976 and 2008 were used to investigate the genetic divergence, evolutionary history, population dynamics, and selection pressure of EBOV among distinct epidemic waves...
October 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27746072/comparative-phylogeography-of-african-fruit-bats-chiroptera-pteropodidae-provide-new-insights-into-the-outbreak-of-ebola-virus-disease-in-west-africa-2014-2016
#9
Alexandre Hassanin, Nicolas Nesi, Julie Marin, Blaise Kadjo, Xavier Pourrut, Éric Leroy, Guy-Crispin Gembu, Prescott Musaba Akawa, Carine Ngoagouni, Emmanuel Nakouné, Manuel Ruedi, Didier Tshikung, Célestin Pongombo Shongo, Céline Bonillo
Both Ebolavirus and Marburgvirus were detected in several fruit bat species of the family Pteropodidae, suggesting that this taxon plays a key role in the life cycle of filoviruses. After four decades of Zaire Ebolavirus (ZEBOV) outbreaks in Central Africa, the virus was detected for the first time in West Africa in 2014. To better understand the role of fruit bats as potential reservoirs and circulating hosts between Central and West Africa, we examine here the phylogeny and comparative phylogeography of Pteropodidae...
October 13, 2016: Comptes Rendus Biologies
https://www.readbyqxmd.com/read/27670273/could-bat-cell-temperature-and-filovirus-filament-length-explain-the-emergence-of-ebola-virus-in-mammals-predictions-of-a-thermodynamic-model
#10
P Gale
The host reservoir of Zaire ebolavirus (EBOV) remains elusive. One suggestion is that EBOV emerges in mammals when the precursor virus jumps from mayflies (or other riverine insects) to insectivorous bats. However, this does not fit with the current view that filoviruses cannot infect arthropods. Here, it is first argued that the evidence that arthropods are refractory is not definitive. Second, it is proposed that a combination of filovirus filament length and the high temperature (~42°C) experienced by an insect virus ingested by a flying bat, together with the large number of insects eaten by bats (e...
September 26, 2016: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/27670117/rescue-of-non-human-primates-from-advanced-sudan-ebolavirus-infection-with-lipid-encapsulated-sirna
#11
Emily P Thi, Amy C H Lee, Joan B Geisbert, Raul Ursic-Bedoya, Krystle N Agans, Marjorie Robbins, Daniel J Deer, Karla A Fenton, Andrew S Kondratowicz, Ian MacLachlan, Thomas W Geisbert, Chad E Mire
Although significant progress has been made in developing therapeutics against Zaire ebolavirus, these therapies do not protect against other Ebola species such as Sudan ebolavirus (SUDV). Here, we describe an RNA interference therapeutic comprising siRNA targeting the SUDV VP35 gene encapsulated in lipid nanoparticle (LNP) technology with increased potency beyond formulations used in TKM-Ebola clinical trials. Twenty-five rhesus monkeys were challenged with a lethal dose of SUDV. Twenty animals received siRNA-LNP beginning at 1, 2, 3, 4 or 5 days post-challenge...
August 22, 2016: Nature Microbiology
https://www.readbyqxmd.com/read/27624088/understanding-ebola-the-2014-epidemic
#12
REVIEW
Jolie Kaner, Sarah Schaack
Near the end of 2013, an outbreak of Zaire ebolavirus (EBOV) began in Guinea, subsequently spreading to neighboring Liberia and Sierra Leone. As this epidemic grew, important public health questions emerged about how and why this outbreak was so different from previous episodes. This review provides a synthetic synopsis of the 2014-15 outbreak, with the aim of understanding its unprecedented spread. We present a summary of the history of previous epidemics, describe the structure and genetics of the ebolavirus, and review our current understanding of viral vectors and the latest treatment practices...
2016: Globalization and Health
https://www.readbyqxmd.com/read/27617851/chemical-targeting-of-a-g-quadruplex-rna-in-the-ebola-virus-l-gene
#13
Shao-Ru Wang, Qiu-Yan Zhang, Jia-Qi Wang, Xing-Yi Ge, Yan-Yan Song, Ya-Fen Wang, Xiao-Dan Li, Bo-Shi Fu, Guo-Hua Xu, Bo Shu, Peng Gong, Bo Zhang, Tian Tian, Xiang Zhou
In the present study, our bioinformatics analysis first reveals the existence of a conserved guanine-rich sequence within the Zaire ebolavirus L gene. Using various methods, we show that this sequence tends to fold into G-quadruplex RNA. TMPyP4 treatment evidently inhibits L gene expression at the RNA level. Moreover, the mini-replicon assay demonstrates that TMPyP4 effectively inhibits the artificial Zaire ebolavirus mini-genome and is a more potent inhibitor than ribavirin. Although TMPyP4 treatment reduced the replication of the mutant mini-genome when G-quadruplex formation was abolished in the L gene, its inhibitory effect was significantly alleviated compared with wild-type...
September 22, 2016: Cell Chemical Biology
https://www.readbyqxmd.com/read/27587634/analytical-validation-of-the-reebov-antigen-rapid-test-for-point-of-care-diagnosis-of-ebola-virus-infection
#14
Robert W Cross, Matthew L Boisen, Molly M Millett, Diana S Nelson, Darin Oottamasathien, Jessica N Hartnett, Abigal B Jones, Augustine Goba, Mambu Momoh, Mohamed Fullah, Zachary A Bornholdt, Marnie L Fusco, Dafna M Abelson, Shunichiro Oda, Bethany L Brown, Ha Pham, Megan M Rowland, Krystle N Agans, Joan B Geisbert, Megan L Heinrich, Peter C Kulakosky, Jeffrey G Shaffer, John S Schieffelin, Brima Kargbo, Momoh Gbetuwa, Sahr M Gevao, Russell B Wilson, Erica Ollmann Saphire, Kelly R Pitts, Sheik Humarr Khan, Donald S Grant, Thomas W Geisbert, Luis M Branco, Robert F Garry
BACKGROUND:  Ebola virus disease (EVD) is a severe viral illness caused by Ebola virus (EBOV). The 2013-2016 EVD outbreak in West Africa is the largest recorded, with >11 000 deaths. Development of the ReEBOV Antigen Rapid Test (ReEBOV RDT) was expedited to provide a point-of-care test for suspected EVD cases. METHODS:  Recombinant EBOV viral protein 40 antigen was used to derive polyclonal antibodies for RDT and enzyme-linked immunosorbent assay development...
October 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27571900/passive-immunotherapy-assessment-of-convalescent-serum-against-ebola-virus-makona-infection-in-nonhuman-primates
#15
Chad E Mire, Joan B Geisbert, Krystle N Agans, Emily P Thi, Amy C H Lee, Karla A Fenton, Thomas W Geisbert
BACKGROUND:  Convalescent serum and blood were used to treat patients during outbreaks of Zaire ebolavirus (ZEBOV) infection in 1976 and 1995, with inconclusive results. During the recent 2013-2016 West African epidemic, serum/plasma from survivors of ZEBOV infection was used to treat patients in the affected countries and several repatriated patients. The effectiveness of this strategy remains unknown. METHODS:  Nine rhesus monkeys were experimentally infected with ZEBOV-Makona...
October 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27571899/inactivation-of-zaire-ebolavirus-variant-makona-in-human-serum-samples-analyzed-by-enzyme-linked-immunosorbent-assay
#16
Todd Cutts, Allen Grolla, Shane Jones, Bradley W M Cook, Xiangguo Qiu, Steven S Theriault
Personnel deployed to remote areas during infectious disease outbreaks have limited access to mechanical and chemical inactivation resources. The inactivation of infectious agents present in diagnostic samples is critical to ensure the safety of personnel and the containment of the disease. We evaluated the efficacy of thermal inactivation (exposure to 56°C for 1 hour) and chemical inactivation with 0.5% Tween-20 against a high titer of Ebola virus (species Zaire ebolavirus) variant Makona in spiked human serum samples...
October 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27549586/evaluation-of-realstar-reverse-transcription-polymerase-chain-reaction-kits-for-filovirus-detection-in-the-laboratory-and-field
#17
Toni Rieger, Romy Kerber, Hussein El Halas, Elisa Pallasch, Sophie Duraffour, Stephan Günther, Stephan Ölschläger
BACKGROUND:  Diagnosis of Ebola virus (EBOV) disease (EVD) requires laboratory testing. METHODS:  The RealStar Filovirus Screen reverse transcription-polymerase chain reaction (RT-PCR) kit and the derived RealStar Zaire Ebolavirus RT-PCR kit were validated using in vitro transcripts, supernatant of infected cell cultures, and clinical specimens from patients with EVD. RESULTS:  The Filovirus Screen kit detected EBOV, Sudan virus, Taï Forest virus, Bundibugyo virus, Reston virus, and Marburg virus and differentiated between the genera Ebolavirus and Marburgvirus The amount of filovirus RNA that could be detected with a probability of 95% ranged from 11 to 67 RNA copies/reaction on a LightCycler 480 II...
October 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27533284/ebola-virus-disease-democratic-republic-of-the-congo-2014
#18
Carolina Nanclares, Jimmy Kapetshi, Fanshen Lionetto, Olimpia de la Rosa, Jean-Jacques Muyembe Tamfun, Miriam Alia, Gary Kobinger, Andrea Bernasconi
During July-November 2014, the Democratic Republic of the Congo underwent its seventh Ebola virus disease (EVD) outbreak. The etiologic agent was Zaire Ebola virus; 66 cases were reported (overall case-fatality rate 74.2%). Through a retrospective observational study of confirmed EVD in 25 patients admitted to either of 2 Ebola treatment centers, we described clinical features and investigated correlates associated with death. Clinical features were mainly generic. At admission, 76% of patients had >1 gastrointestinal symptom and 28% >1 hemorrhagic symptom...
September 2016: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/27528741/computational-analysis-of-ebolavirus-data-prospects-promises-and-challenges
#19
REVIEW
Martin Michaelis, Jeremy S Rossman, Mark N Wass
The ongoing Ebola virus (also known as Zaire ebolavirus, a member of the Ebolavirus family) outbreak in West Africa has so far resulted in >28000 confirmed cases compared with previous Ebolavirus outbreaks that affected a maximum of a few hundred individuals. Hence, Ebolaviruses impose a much greater threat than we may have expected (or hoped). An improved understanding of the virus biology is essential to develop therapeutic and preventive measures and to be better prepared for future outbreaks by members of the Ebolavirus family...
August 15, 2016: Biochemical Society Transactions
https://www.readbyqxmd.com/read/27525406/-viral-superantigens
#20
Dürdal Us
Superantigens (SAgs) are microbial proteins produced by various microorganisms that elicit excessive and strong stimulation of T cells via an unconventional mechanism. They cause polyclonal activation of T cells in a non-specific manner, by binding to a particular variable-beta (Vβ) chain of T-cell receptor (TCR) and MHC class II molecule, in unprocessed form and outside of peptide-binding cleft, forming a bridge between the antigen presenting cell and the T cell. SAgs are classified into three groups, namely 1) exogenous (soluble proteins and exotoxins secreted by microorganisms), 2) endogenous (transmembrane proteins encoded by viruses which are integrated into the genome) and 3) B-cell SAgs (proteins which stimulate predominantly B cells)...
July 2016: Mikrobiyoloji Bülteni
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