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Tick borne-encephalitis virus

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https://www.readbyqxmd.com/read/29030314/distribution-of-ixodes-ricinus-ticks-and-prevalence-of-tick-borne-encephalitis-virus-among-questing-ticks-in-the-arctic-circle-region-of-northern-norway
#1
A Soleng, K S Edgar, K M Paulsen, B N Pedersen, Y B Okbaldet, I E B Skjetne, D Gurung, R Vikse, Å K Andreassen
This study investigated the geographical distribution of Ixodes ricinus and prevalence of the tick-borne encephalitis virus (TBEV) in northern Norway. Flagging for questing I. ricinus ticks was performed in areas ranging from Vikna in Nord-Trøndelag County, located 190km south of the Arctic Circle (66.3°N), to Steigen in Nordland County, located 155km north of the Arctic Circle. We found that ticks were abundant in both Vikna (64.5°N) and Brønnøy (65.1°N). Only a few ticks were found at locations ∼66°N, and no ticks were found at several locations up to 67...
October 8, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/29029730/assessing-the-diversity-of-rodent-borne-viruses-exploring-of-high-throughput-sequencing-and-classical-amplification-sequencing-approaches
#2
Stephan Drewes, Petra Straková, Jan F Drexler, Jens Jacob, Rainer G Ulrich
Rodents are distributed throughout the world and interact with humans in many ways. They provide vital ecosystem services, some species are useful models in biomedical research and some are held as pet animals. However, many rodent species can have adverse effects such as damage to crops and stored produce, and they are of health concern because of the transmission of pathogens to humans and livestock. The first rodent viruses were discovered by isolation approaches and resulted in break-through knowledge in immunology, molecular and cell biology, and cancer research...
2017: Advances in Virus Research
https://www.readbyqxmd.com/read/29020227/rapid-detection-of-powassan-virus-in-a-patient-with-encephalitis-by-metagenomic-sequencing
#3
Anne Piantadosi, Sanjat Kanjilal, Vijay Ganesh, Arjun Khanna, Emily P Hyle, Jonathan Rosand, Tyler Bold, Hayden C Metsky, Jacob Lemieux, Michael J Leone, Lisa Freimark, Christian B Matranga, Gordon Adams, Graham McGrath, Siavash Zamirpour, Sam Telford, Eric Rosenberg, Tracey Cho, Matthew P Frosch, Marcia B Goldberg, Shibani S Mukerji, Pardis C Sabeti
We describe a patient with severe and progressive encephalitis of unknown etiology. We performed rapid metagenomic sequencing from cerebrospinal fluid and identified Powassan virus, an emerging tick-borne flavivirus that has been increasingly detected in the United States.
September 13, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29017579/surveillance-of-ixodes-ricinus-ticks-acari-ixodidae-in-iceland
#4
Matthias Alfredsson, Erling Olafsson, Matthias Eydal, Ester Rut Unnsteinsdottir, Kayleigh Hansford, William Wint, Neil Alexander, Jolyon M Medlock
BACKGROUND: Ixodes ricinus is a three-host tick, a principal vector of Borrelia burgdorferi (s.l.) and one of the main vectors of tick-borne encephalitis (TBE) virus. Iceland is located in the North Atlantic Ocean with subpolar oceanic climate. During the past 3-4 decades, average temperature has increased, supporting more favourable conditions for ticks. Reports of I. ricinus have increased in recent years. If these ticks were able to establish in a changing climate, Iceland may face new threats posed by tick-borne diseases...
October 10, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28988602/a-new-hot-spot-for-tick-borne-encephalitis-tbe-a-marked-increase-of-tbe-cases-in-france-in-2016
#5
Aurélie Velay, Morgane Solis, Wallys Kack-Kack, Pierre Gantner, Marianne Maquart, Martin Martinot, Olivier Augereau, Dominique De Briel, Pierre Kieffer, Caroline Lohmann, Jean Dominique Poveda, Emmanuelle Cart-Tanneur, Xavier Argemi, Isabelle Leparc-Goffart, Sylvie de Martino, Benoit Jaulhac, Sophie Raguet, Marie-Josée Wendling, Yves Hansmann, Samira Fafi-Kremer
OBJECTIVES: Tick-borne encephalitis virus (TBEV) is a zoonotic agent causing severe encephalitis. In 2016, in Northeastern France, we faced a TBEV infection increase, leading to a warning from the Regional Health Agency. Here, we report the confirmed TBE cases diagnosed between January 2013 and December 2016, with particular emphasis on the year 2016. METHODS: A total of 1643 blood and cerebrospinal fluid (CSF) samples from everywhere in France, corresponding to 1460 patients, were prospectively tested for anti-TBEV-specific IgM and IgG antibodies by ELISA...
September 28, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28976562/seroprevalence-of-lymphocytic-choriomeningitis-virus-and-ljungan-virus-in-finnish-patients-with-suspected-neurological-infections
#6
Cristina Fevola, Suvi Kuivanen, Teemu Smura, Antti Vaheri, Hannimari Kallio-Kokko, Heidi C Hauffe, Olli Vapalahti, Anne J Jääskeläinen
BACKGROUND: Directly-transmitted rodent-borne zoonotic viruses, such as lymphocytic choriomeningitis virus (LCMV) can cause nervous system infections. Rodent-borne Ljungan virus (LV) is considered potentially zoonotic possibly causing neurological symptoms. Our objective was to understand the role of these two viruses compared to other pathogens in causing neurological infections in Finnish patients. METHODS: Routine screening data were available for 400 patients aged 5-50 years, collected from December 2013-December 2014 with suspected neurological infection...
October 4, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28975470/infections-of-the-central-nervous-system-in-returning-travelers-and-immigrants
#7
REVIEW
Haley Thompson, Kiran Thakur
PURPOSE OF REVIEW: This review highlights current knowledge in travel-related neuroinfectious diseases, providing insight on approaches to prevention, diagnosis, and treatment of infections of the central nervous system (CNS) in travelers and immigrants. RECENT FINDINGS: Updates on travel vaccine recommendations including vaccine-specific interactions with immunosuppressive agents, advances in Zika virus and dengue virus vaccine development, new diagnostic criteria for neurocysticercosis, updates on treatment approaches for tuberculosis meningitis...
October 3, 2017: Current Infectious Disease Reports
https://www.readbyqxmd.com/read/28948950/a-mini-review-of-bunyaviruses-recorded-in-india
#8
REVIEW
Pragya D Yadav, Gouri Y Chaubal, Anita M Shete, Devendra T Mourya
Newly emerging and re-emerging viral infections are of major public health concern. Bunyaviridae family of viruses comprises a large group of animal viruses. Clinical symptoms exhibited by persons infected by viruses belonging to this family vary from mild-to-severe diseases i.e., febrile illness, encephalitis, haemorrhagic fever and acute respiratory illness. Several arthropods-borne viruses have been discovered and classified at serological level in India in the past. Some of these are highly pathogenic as the recent emergence and spread of Crimean-Congo haemorrhagic fever virus and presence of antibodies against Hantavirus in humans in India have provided evidences that it may become one of the emerging diseases in this country...
May 2017: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/28928417/tick-borne-encephalitis-in-japan-republic-of-korea-and-china
#9
REVIEW
Kentaro Yoshii, Joon Young Song, Seong-Beom Park, Junfeng Yang, Heinz-Josef Schmitt
Tick-borne encephalitis virus (TBEV) causes mild or moderate febrile illness in humans that may progress to encephalitis, leading to severe long-term complications and sometimes death. TBEV is prevalent in the Eurasian continent and has been isolated in China, Japan and Republic of Korea (ROK). The TBEV isolates from Japan are of the Far-Eastern subtype; in ROK, the isolates are of the Western subtype; and all TBEV isolates in China are of the Far-Eastern subtype, except one strain that was identified most recently as the Siberian subtype...
September 20, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/28919548/reconsidering-the-classification-of-tick-borne-encephalitis-virus-within-the-siberian-subtype-gives-new-insights-into-its-evolutionary-history
#10
S Y Kovalev, T A Mukhacheva
Tick-borne encephalitis is widespread in Eurasia and transmitted by Ixodes ticks. Classification of its causative agent, tick-borne encephalitis virus (TBEV), includes three subtypes, namely Far-Eastern, European, and Siberian (TBEV-Sib), as well as a group of 886-84-like strains with uncertain taxonomic status. TBEV-Sib is subdivided into three phylogenetic lineages: Baltic, Asian, and South-Siberian. A reason to reconsider TBEV-Sib classification was the analysis of 186 nucleotide sequences of an E gene fragment submitted to GenBank during the last two years...
September 15, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28915259/a-novel-mechanism-of-antibody-mediated-enhancement-of-flavivirus-infection
#11
Denise Haslwanter, Dieter Blaas, Franz X Heinz, Karin Stiasny
Antibody-dependent enhancement of viral infection is a well-described phenomenon that is based on the cellular uptake of infectious virus-antibody complexes following their interaction with Fcγ receptors expressed on myeloid cells. Here we describe a novel mechanism of antibody-mediated enhancement of infection by a flavivirus (tick-borne encephalitis virus) in transformed and primary human cells, which is independent of the presence of Fcγ receptors. Using chemical cross-linking and immunoassays, we demonstrate that the monoclonal antibody (mab) A5, recognizing an epitope at the interface of the dimeric envelope protein E, causes dimer dissociation and leads to the exposure of the fusion loop (FL)...
September 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28869941/identifying-attenuating-mutations-tools-for-a-new-vaccine-design-against-flaviviruses
#12
Cécile Khou, Nathalie Pardigon
Emerging Flaviviruses pose an increasing threat to global human health. To date, human vaccines against yellow fever virus (YFV), Japanese encephalitis virus (JEV), dengue virus (DV), and tick-borne encephalitis virus (TBEV) exist. However, there is no human vaccine against other Flaviviruses such as Zika virus (ZIKV) and West Nile virus (WNV). In order to restrict their spread and to protect populations against the diseases they induce, vaccines against these emerging viruses must be designed. Obtaining new live attenuated Flavivirus vaccines using molecular biology methods is now possible...
2017: Intervirology
https://www.readbyqxmd.com/read/28830948/flavivirus-infection-of-ixodes-scapularis-black-legged-tick-ex-vivo-organotypic-cultures-and-applications-for-disease-control
#13
Jeffrey M Grabowski, Konstantin A Tsetsarkin, Dan Long, Dana P Scott, Rebecca Rosenke, Tom G Schwan, Luwanika Mlera, Danielle K Offerdahl, Alexander G Pletnev, Marshall E Bloom
Ixodes scapularis ticks transmit many infectious agents that cause disease, including tick-borne flaviviruses (TBFVs). TBFV infections cause thousands of human encephalitis cases worldwide annually. In the United States, human TBFV infections with Powassan virus (POWV) are increasing and have a fatality rate of 10 to 30%. Additionally, Langat virus (LGTV) is a TBFV of low neurovirulence and is used as a model TBFV. TBFV replication and dissemination within I. scapularis organs are poorly characterized, and a deeper understanding of virus biology in this vector may inform effective countermeasures to reduce TBFV transmission...
August 22, 2017: MBio
https://www.readbyqxmd.com/read/28830430/tick-borne-encephalitis-in-a-naturally-infected-sheep
#14
Brigitte Böhm, Benjamin Schade, Benjamin Bauer, Bernd Hoffmann, Donata Hoffmann, Ute Ziegler, Martin Beer, Christine Klaus, Herbert Weissenböck, Jens Böttcher
BACKGROUND: Tick-borne encephalitis (TBE) is the most important viral tick borne zoonosis in Europe. In Germany, about 250 human cases are registered annually, with the highest incidence reported in the last years coming from the federal states Bavaria and Baden-Wuerttemberg. In veterinary medicine, only sporadic cases in wild and domestic animals have been reported; however, a high number of wild and domestic animals have tested positive for the tick-borne encephalitis virus (TBEV) antibody...
August 22, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28829131/lipid-phase-control-and-secondary-structure-of-viral-fusion-peptides-anchored-in-monoolein-membranes
#15
Artem Levin, Christoph Jeworrek, Roland Winter, Katrin Weise, Claus Czeslik
The fusion of lipid membranes involves major changes of the membrane curvatures and is mediated by fusion proteins that bind to the lipid membranes. For a better understanding of the way fusion proteins steer this process, we have studied the interaction of two different viral fusion peptides, HA2-FP and TBEV-FP, with monoolein mesophases as a function of temperature and pressure at limited hydration. The fusion peptides are derived from the influenza virus hemagglutinin fusion protein (HA2-FP) and from the tick-borne encephalitis virus envelope glycoprotein E (TBEV-FP)...
August 31, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28827760/protein-structure-shapes-immunodominance-in-the-cd4-t-cell-response-to-yellow-fever-vaccination
#16
Maximilian Koblischke, Maria S Mackroth, Julia Schwaiger, Ingrid Fae, Gottfried Fischer, Karin Stiasny, Franz X Heinz, Judith H Aberle
The live attenuated yellow fever (YF) vaccine is a highly effective human vaccine and induces long-term protective neutralizing antibodies directed against the viral envelope protein E. The generation of such antibodies requires the help of CD4 T cells which recognize peptides derived from proteins in virus particles internalized and processed by E-specific B cells. The CD4 T helper cell response is restricted to few immunodominant epitopes, but the mechanisms of their selection are largely unknown. Here, we report that CD4 T cell responses elicited by the YF-17D vaccine are focused to hotspots of two helices of the viral capsid protein and to exposed strands and loops of E...
August 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28814513/escape-of-tick-borne-flavivirus-from-2-c-methylated-nucleoside-antivirals-is-mediated-by-a-single-conservative-mutation-in-ns5-that-has-a-dramatic-effect-on-viral-fitness
#17
Ludek Eyer, Hirofumi Kondo, Darina Zouharova, Minato Hirano, James J Valdés, Memi Muto, Tomas Kastl, Shintaro Kobayashi, Jan Haviernik, Manabu Igarashi, Hiroaki Kariwa, Marketa Vaculovicova, Jiri Cerny, Rene Kizek, Andrea Kröger, Stefan Lienenklaus, Milan Dejmek, Radim Nencka, Martin Palus, Jiri Salat, Erik De Clercq, Kentaro Yoshii, Daniel Ruzek
Tick-borne encephalitis virus (TBEV) causes a severe and potentially fatal neuroinfection in humans. Despite its high medical relevance, no specific antiviral therapy is currently available. Here we demonstrate that treatment with a nucleoside analog, 7-deaza-2' -C-methyladenosine (7-deaza-2' -CMA), substantially improved disease outcome, increased survival, and reduced signs of neuroinfection and viral titers in the brains of mice infected with a lethal dose of TBEV. To investigate the mechanism of action of 7-deaza-2' -CMA, two drug-resistant TBEV clones were generated and characterized...
August 16, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28791846/serum-carnitine-and-acyl-carnitine-in-patients-with-meningitis-due-to-tick-borne-encephalitis-virus-infection
#18
Alina Kępka, Roman M Janas, Sławomir A Pancewicz, Renata Świerzbińska
BACKGROUND: Hard ticks are the main vectors of tick-borne encephalitis virus (TBEV). Free carnitine (FC) and acylcarnitines (AC) have the basic role in β-oxidation as well as the modulation of immune and nervous system. Homeostasis of carnitines in the TBE patients was not studied so far. OBJECTIVES: This study aimed to evaluate FC and AC serum concentrations in patients with meningitis due to TBEV infection before and after 14 ± 3 days of treatment. MATERIAL AND METHODS: The study was performed in 14 patients aged 48 ± 29 years that were divided a posteriori (based on their FC level before and after treatment) into 2 subgroups: 1-8 and 9-14...
March 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28768435/cycluridine-a-novel-antiviral-effective-against-flaviviruses
#19
REVIEW
Angel S Galabov, Lucia Mukova, Yuriy P Abashev, Lilia Wassilewa, Petko Tzvetkov, Vassil Minkov, Igor F Barinskiy, Charles M Rice, Sergey Ouzounov, Dorotea Sidzhakova
This review describes the contemporary state of research for antivirals effective against flaviviruses, especially focusing on inhibitors of the pestivirus causative agent of bovine viral diarrhoea virus. We highlight cycluridine, an originally synthesized Mannich's base [a tetrahydro-2(1H)-pyrimidinones derivative], as a highly effective antiviral possessing a strong inhibitory effect on bovine viral diarrhoea virus replication. Cycluridine was active against replication of a wide variety of bovine viral diarrhoea virus strains in cell cultures...
August 2017: Antiviral Chemistry & Chemotherapy
https://www.readbyqxmd.com/read/28762591/ean-consensus-review-on-prevention-diagnosis-and-management-of-tick-borne-encephalitis
#20
REVIEW
P Taba, E Schmutzhard, P Forsberg, I Lutsar, U Ljøstad, Å Mygland, I Levchenko, F Strle, I Steiner
BACKGROUND AND PURPOSE: Tick-borne encephalitis (TBE) is an infection of the central nervous system (CNS) caused by tick-borne encephalitis virus (TBEV) and transmitted by ticks, with a variety of clinical manifestations. The incidence of TBE in Europe is increasing due to an extended season of the infection and the enlargement of endemic areas. Our objectives are to provide recommendations on the prevention, diagnosis and management of TBE, based on evidence or consensus decisions. METHODS: For systematic evaluation, the literature was searched from 1970 to 2015 (including early online publications of 2016), and recommendations were based on evidence or consensus decisions of the Task Force when evidence-based data were not available...
August 1, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
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