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https://www.readbyqxmd.com/read/28093544/annual-incidence-of-lassa-virus-infection-in-southern-mali
#1
David Safronetz, Nafomon Sogoba, Sory Ibrahim Diawara, Sidy Bane, Kyle Rosenke, Ousmane Maiga, Matt Boisen, Robert F Garry, Luis M Branco, L Robbin Lindsay, Sékou F Traoré, Heinz Feldmann, Seydou Doumbia
Previously, we reported a high seroprevalence rate of Lassa virus antibodies in inhabitants of three villages in southern Mali where infected rodents have been demonstrated. Herein, we report a 1-year follow-up study in which we were able to collect a second blood samples from 88.7% of participants of the same cohort. We identified 23 seroconversions for IgG antibodies reactive against Lassa virus, representing an incidence of 6.3% (95% confidence interval = 3.8-8.8%). Seroconversion was frequently seen in preteenage children (12/23, 51...
January 16, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28076397/when-viruses-don-t-go-viral-the-importance-of-host-phylogeographic-structure-in-the-spatial-spread-of-arenaviruses
#2
Sophie Gryseels, Stuart J E Baird, Benny Borremans, Rhodes Makundi, Herwig Leirs, Joëlle Goüy de Bellocq
Many emerging infections are RNA virus spillovers from animal reservoirs. Reservoir identification is necessary for predicting the geographic extent of infection risk, but rarely are taxonomic levels below the animal species considered as reservoir, and only key circumstances in nature and methodology allow intrinsic virus-host associations to be distinguished from simple geographic (co-)isolation. We sampled and genetically characterized in detail a contact zone of two subtaxa of the rodent Mastomys natalensis in Tanzania...
January 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28012899/corning-hyperflask-%C3%A2-for-viral-amplification-and-production-of-diagnostic-reagents
#3
Brian J Kearney, Matthew A Voorhees, Priscilla L Williams, Scott P Olschner, Cynthia A Rossi, Randal J Schoepp
Viral preparations are essential components in diagnostic research and development. The production of large quantities of virus traditionally is done by infecting numerous tissue culture flasks or roller bottles, which require large incubators and/or roller bottle racks. The Corning HYPERFlask(®) is a multilayer flask that uses a gas permeable film to provide gas exchange between the cells and culture medium and the atmospheric environment. This study evaluated the suitability of the HYPERFlask for production of Lassa, Ebola, Bundibugyo, Reston, and Marburg viruses and compared it to more traditional methods using tissue culture flasks and roller bottles...
December 21, 2016: Journal of Virological Methods
https://www.readbyqxmd.com/read/27999160/25-hydroxycholesterol-inhibition-of-lassa-virus-infection-through-aberrant-gp1-glycosylation
#4
Punya Shrivastava-Ranjan, Éric Bergeron, Ayan K Chakrabarti, César G Albariño, Mike Flint, Stuart T Nichol, Christina F Spiropoulou
: Lassa virus (LASV) infection is a major public health concern due to high fatality rates and limited effective treatment. The interferon-stimulated gene cholesterol 25-hydroxylase (CH25H) encodes an enzyme that catalyzes the production of 25-hydroxycholesterol (25HC). 25HC is involved in regulating cholesterol biosynthesis and has recently been identified as a potent antiviral targeting enveloped virus entry. Here, we show a previously unrecognized role of CH25H in inhibiting LASV glycoprotein glycosylation and the production of infectious virus...
December 20, 2016: MBio
https://www.readbyqxmd.com/read/27976464/methods-for-collecting-paired-observations-from-emergency-medical-services-and-emergency-department-providers-for-pediatric-cervical-spine-injury-risk-factors
#5
Fahd A Ahmad, Hamilton Schwartz, Lorin R Browne, Sherry Lassa-Claxton, Michael Wallendorf, E Brooke Lerner, Nathan Kuppermann, Julie C Leonard
OBJECTIVES: Cervical spine injuries (CSI) after blunt trauma in children are rare but cause substantial morbidity and mortality. Emergency medical services (EMS) and emergency department (ED) providers routinely use spinal precautions and cervical spine imaging respectively during the management of children experiencing blunt trauma. These practices lack evidence, and there is concern that they may be harmful. A pediatric CSI risk-assessment tool is needed to inform EMS and ED provider decision-making...
December 15, 2016: Academic Emergency Medicine: Official Journal of the Society for Academic Emergency Medicine
https://www.readbyqxmd.com/read/27975074/imported-case-of-lassa-fever-in-sweden-with-encephalopathy-and-sensorineural-hearing-deficit
#6
Anna Grahn, Andreas Bråve, Martin Lagging, Leif Dotevall, David Ekqvist, Helena Hammarström, Helen Karlberg, Nina Lagerqvist, Martina Sansone, Anders Tegnell, Peter Ulleryd, Marie Studahl
We describe an imported case of Lassa fever with both encephalopathy and bilateral sensorineural hearing deficit. Absence of fever during hospitalization, initially nonspecific symptoms, and onset of hearing deficit in a late stage of disease probably contributed to delayed diagnosis (14 days after admittance to hospital). The pathogenesis of neurological manifestations of Lassa fever is poorly understood and no specific treatment was given. A total of 118 personnel had close contact with the patient, but no secondary cases occurred...
October 2016: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/27957363/aseptic-meningitis-caused-by-lassa-virus-case-series-report
#7
Peter O Okokhere, Idowu A Bankole, Christopher O Iruolagbe, Benard E Muoebonam, Martha O Okonofua, Simeon O Dawodu, George O Akpede
The Lassa virus is known to cause disease in different organ systems of the human body, with varying clinical manifestations. The features of severe clinical disease may include bleeding and/or central nervous system manifestations. Whereas Lassa fever encephalopathy and encephalitis are well described in the literature, there is paucity of data on Lassa virus meningitis. We present the clinical description, laboratory diagnosis, and management of 4 consecutive cases of aseptic meningitis associated with Lassa virus infection without bleeding seen in a region of Nigeria known to be endemic for both the reservoir rodent and Lassa fever...
2016: Case Reports in Neurological Medicine
https://www.readbyqxmd.com/read/27928003/lassa-virus-cell-entry-reveals-new-aspects-of-virus-host-cell-interaction
#8
Giulia Torriani, Clara Galan-Navarro, Stefan Kunz
Viral entry represents the first step of every viral infection and is a determinant for the host-range and disease potential of a virus. Here we review the latest developments on cell entry of the highly pathogenic Old World arenavirus Lassa, providing novel insights into the complex host cell interaction of this important human pathogen. We will cover new discoveries on the molecular mechanisms of receptor recognition, endocytosis, and the use of late endosomal entry factors.
December 7, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27855284/development-of-live-attenuated-arenavirus-vaccines-based-on-codon-deoptimization-of-the-viral-glycoprotein
#9
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...
January 15, 2017: Virology
https://www.readbyqxmd.com/read/27795340/comparison-of-magpix-assays-and-enzyme-linked-immunosorbent-assay-for-detection-of-hemorrhagic-fever-viruses
#10
Neal G Satterly, Matthew A Voorhees, Abbe D Ames, Randal J Schoepp
Viral hemorrhagic fevers, because of their high mortality rates, the lack of medical countermeasures, and their 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 enzyme-linked immunosorbent assay (ELISA); however, newer technologies are emerging with increased sensitivities...
January 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/27785522/disinfection-of-aircraft-appropriate-disinfectants-and-standard-operating-procedures-for-highly-infectious-diseases
#11
Joachim Klaus, Peter Gnirs, Sabine Hölterhoff, Angela Wirtz, Matthias Jeglitza, Walter Gaber, Rene Gottschalk
For infectious diseases caused by highly pathogenic agents (e. g., Ebola/Lassa fever virus, SARS-/MERS-CoV, pandemic influenza virus) which have the potential to spread over several continents within only a few days, international Health Protection Authorities have taken appropriate measures to limit the consequences of a possible spread. A crucial point in this context is the disinfection of an aircraft that had a passenger on board who is suspected of being infected with one of the mentioned diseases...
December 2016: Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz
https://www.readbyqxmd.com/read/27771389/lassa-and-ebola-virus-inhibitors-identified-using-minigenome-and-recombinant-virus-reporter-systems
#12
Stephen R Welch, Lisa Wiggleton Guerrero, Ayan K Chakrabarti, Laura K McMullan, Mike Flint, Gregory R Bluemling, George R Painter, Stuart T Nichol, Christina F Spiropoulou, César G Albariño
Lassa virus (LASV) and Ebola virus (EBOV) infections are important global health issues resulting in significant morbidity and mortality. While several promising drug and vaccine trials for EBOV are ongoing, options for LASV infection are currently limited to ribavirin treatment. A major factor impeding the development of antiviral compounds to treat these infections is the need to manipulate the virus under BSL-4 containment, limiting research to a few institutes worldwide. Here we describe the development of a novel LASV minigenome assay based on the ambisense LASV S segment genome, with authentic terminal untranslated regions flanking a ZsGreen (ZsG) fluorescent reporter protein and a Gaussia princeps luciferase (gLuc) reporter gene...
October 19, 2016: Antiviral Research
https://www.readbyqxmd.com/read/27736754/favipiravir-pharmacokinetics-in-nonhuman-primates-and-insights-for-future-efficacy-studies-of-hemorrhagic-fever-viruses
#13
Vincent Madelain, Jérémie Guedj, France Mentré, Thi Huyen Tram Nguyen, Frédéric Jacquot, Lisa Oestereich, Takumi Kadota, Koichi Yamada, Anne-Marie Taburet, Xavier de Lamballerie, Hervé Raoul
Favipiravir is an RNA polymerase inhibitor that showed strong antiviral efficacy in vitro and in small-animal models of several viruses responsible for hemorrhagic fever (HF), including Ebola virus. The aim of this work was to characterize the complex pharmacokinetics of favipiravir in nonhuman primates (NHPs) in order to guide future efficacy studies of favipiravir in large-animal models. Four different studies were conducted in 30 uninfected cynomolgus macaques of Chinese (n = 17) or Mauritian (n = 13) origin treated with intravenous favipiravir for 7 to 14 days with maintenance doses of 60 to 180 mg/kg of body weight twice a day (BID)...
January 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27716429/serosurveillance-of-viral-pathogens-circulating-in-west-africa
#14
Aileen E O'Hearn, Matthew A Voorhees, David P Fetterer, Nadia Wauquier, Moinya R Coomber, James Bangura, Joseph N Fair, Jean-Paul Gonzalez, Randal J Schoepp
BACKGROUND: Sub-Saharan Africa is home to a variety of pathogens, but disease surveillance and the healthcare infrastructure necessary for proper management and control are severely limited. Lassa virus, the cause of Lassa fever, a severe hemorrhagic fever in humans is endemic in West Africa. In Sierra Leone at the Kenema Government Hospital Lassa Diagnostic Laboratory, up to 70 % of acute patient samples suspected of Lassa fever test negative for Lassa virus infection. This large amount of acute undiagnosed febrile illness can be attributed in part to an array of hemorrhagic fever and arthropod-borne viruses causing disease that goes undetected and untreated...
October 3, 2016: Virology Journal
https://www.readbyqxmd.com/read/27704591/a-cell-based-high-throughput-protocol-to-screen-entry-inhibitors-of-highly-pathogenic-viruses-with-traditional-chinese-medicines
#15
Yong Yang, Han Cheng, Hui Yan, Peng-Zhan Wang, Rong Rong, Ying-Ying Zhang, Cheng-Bo Zhang, Rui-Kun Du, Li-Jun Rong
Emerging viruses such as Ebola virus (EBOV), Lassa virus (LASV), and avian influenza virus H5N1 (AIV) are global health concerns. Since there is very limited options (either vaccine or specific therapy) approved for humans against these viruses, there is an urgent need to develop prophylactic and therapeutic treatments. Previously we reported a high-throughput screening (HTS) protocol to identify entry inhibitors for three highly pathogenic viruses (EBOV, LASV, and AIV) using a human immunodeficiency virus-based pseudotyping platform which allows us to perform the screening in a BSL-2 facility...
October 5, 2016: Journal of Medical Virology
https://www.readbyqxmd.com/read/27660771/genome-sequence-of-lassa-virus-isolated-from-the-first-domestically-acquired-case-in-germany
#16
Svenja Wolff, Tilman Schultze, Sarah Katharina Fehling, Jan Philipp Mengel, Gerrit Kann, Timo Wolf, Markus Eickmann, Stephan Becker, Torsten Hain, Thomas Strecker
Lassa virus (LASV) is a zoonotic, hemorrhagic fever-causing virus endemic in West Africa, for which no approved vaccines or specific treatment options exist. Here, we report the genome sequence of LASV isolated from the first case of acquired Lassa fever disease outside of Africa.
2016: Genome Announcements
https://www.readbyqxmd.com/read/27630390/postexposure-prophylaxis-for-lassa-fever-experience-from-a-recent-outbreak-in-nigeria
#17
Samson E Isa, Attah Okwute, Kelly O Iraoyah, Shehu Y Nathan, Gomerep S Simji, Mark O Okolo, Joseph Anejo-Okopi, Daria Spicola, Daisy E Isa
BACKGROUND: Secondary transmission of Lassa fever (LF) occurs in the community and in health-care facilities, and is associated with high fatality in Nigeria. We investigated the role of oral ribavirin postexposure prophylaxis (orPEP) in preventing LF among the primary contacts of confirmed cases from December 2015 to March 2016. MATERIALS AND METHODS: Epidemiological and clinical data of LF contacts were prospectively collected. However, information regarding ribavirin adverse effects (AEs) were collected retrospectively through a telephone interview...
July 2016: Nigerian Medical Journal: Journal of the Nigeria Medical Association
https://www.readbyqxmd.com/read/27630230/characterization-of-the-glycoprotein-stable-signal-peptide-in-mediating-pichinde-virus-replication-and-virulence
#18
Junjie Shao, Xiaoying Liu, Hinh Ly, Yuying Liang
Arenaviruses can cause lethal hemorrhagic fevers in humans with few preventative and therapeutic measures. The arenaviral glycoprotein stable signal peptide (SSP) is unique among signal peptides in that it is an integral component of the mature glycoprotein complex (GPC) and plays important roles not only in GPC expression and processing but also in the membrane fusion process during viral entry. Using the Pichinde virus (PICV) reverse genetics system, we analyzed the effects of alanine substitutions at many conserved residues within the SSP on viral replication in cell culture and in a guinea pig infection model...
November 15, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27605678/role-of-lamp1-binding-and-ph-sensing-by-the-spike-complex-of-lassa-virus
#19
Hadas Cohen-Dvashi, Hadar Israeli, Orly Shani, Aliza Katz, Ron Diskin
: To effectively infect cells, Lassa virus needs to switch in an endosomal compartment from its primary receptor, α-dystroglycan, to a protein termed LAMP1. A unique histidine triad on the surface of the receptor-binding domain from the glycoprotein spike complex of Lassa virus is important for LAMP1 binding. Here we investigate mutated spikes that have an impaired ability to interact with LAMP1 and show that although LAMP1 is important for efficient infectivity, it is not required for spike-mediated membrane fusion per se Our studies reveal important regulatory roles for histidines from the triad in sensing acidic pH and preventing premature spike triggering...
November 15, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27588425/a-unified-framework-for-the-infection-dynamics-of-zoonotic-spillover-and-spread
#20
Giovanni Lo Iacono, Andrew A Cunningham, Elisabeth Fichet-Calvet, Robert F Garry, Donald S Grant, Melissa Leach, Lina M Moses, Gordon Nichols, John S Schieffelin, Jeffrey G Shaffer, Colleen T Webb, James L N Wood
A considerable amount of disease is transmitted from animals to humans and many of these zoonoses are neglected tropical diseases. As outbreaks of SARS, avian influenza and Ebola have demonstrated, however, zoonotic diseases are serious threats to global public health and are not just problems confined to remote regions. There are two fundamental, and poorly studied, stages of zoonotic disease emergence: 'spillover', i.e. transmission of pathogens from animals to humans, and 'stuttering transmission', i.e. when limited human-to-human infections occur, leading to self-limiting chains of transmission...
September 2016: PLoS Neglected Tropical Diseases
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