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Tick borne-encephalitis virus

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https://www.readbyqxmd.com/read/28346868/circulation-of-zoonotic-arboviruses-in-equine-populations-of-mallorca-island-spain
#1
Jessica Vanhomwegen, Cécile Beck, Philippe Desprès, Amanda Figuerola, Ramón García, Sylvie Lecollinet, Marc López-Roig, Jean-Claude Manuguerra, Jordi Serra-Cobo
The presence of major arbovirus vector species, climate change that promotes the expansion and increase of their populations, and potential animal reservoirs mean that vector-borne diseases represent a significant health risk for Mallorca's inhabitants. Microbiological monitoring of circulating arboviruses, particularly flaviviruses causing encephalitis, was initiated using domestic horses from localities near wetlands as "sentinel" hosts. A total of 291 blood samples were taken from 172 horses between 2011 and 2012, using paired samples to highlight seroconversion events...
March 27, 2017: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/28341533/epidemiology-of-infectious-encephalitis-causes-in-2016
#2
REVIEW
A Boucher, J L Herrmann, P Morand, R Buzelé, Y Crabol, J P Stahl, A Mailles
We performed a literature search in the Medline database, using the PubMed website. The incidence of presumably infectious encephalitis is estimated at 1.5-7 cases/100,000 inhabitants/year, excluding epidemics. Infectious encephalitis and immune-mediated encephalitis share similar clinical signs and symptoms. The latter accounts for a significant proportion of presumably infectious encephalitis cases without any established etiological diagnosis; as shown from a prospective cohort study where 21% of cases were due to an immune cause...
March 21, 2017: Médecine et Maladies Infectieuses
https://www.readbyqxmd.com/read/28336423/comparative-analysis-of-complete-genome-sequences-of-european-subtype-tick-borne-encephalitis-virus-strains-isolated-from-ixodes-persulcatus-ticks-long-tailed-ground-squirrel-spermophilus-undulatus-and-human-blood-in-the-asian-part-of-russia
#3
T V Demina, S E Tkachev, I V Kozlova, E K Doroshchenko, O V Lisak, O V Suntsova, M M Verkhozina, Yu P Dzhioev, A I Paramonov, A Y Tikunov, N V Tikunova, V I Zlobin, D Ruzek
Tick-borne encephalitis virus (TBEV) is divided into three subtypes: European (TBEV-Eu), Siberian (TBEV-Sib), and Far Eastern (TBEV-FE) subtypes. The geographical range of TBEV-Eu dominates in Europe, but this subtype is present focally across the whole non-tropical forested Eurasian belt, through Russia to South Korea. However, the TBEV-Eu strains isolated outside Europe remain poorly characterized. In this study, full-genome sequences of eight TBEV-Eu isolates were determined. These strains were isolated from Ixodes persulcatus ticks, long-tailed ground squirrel (Spermophilus undulatus), and human blood in the natural foci of Western and Eastern Siberia, Russia...
March 9, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28336346/antiviral-activity-of-the-adenosine-analogue-bcx4430-against-west-nile-virus-and-tick-borne-flaviviruses
#4
Luděk Eyer, Darina Zouharová, Jana Širmarová, Martina Fojtíková, Michal Štefánik, Jan Haviernik, Radim Nencka, Erik de Clercq, Daniel Růžek
There are currently no approved antiviral therapies against medically important human flaviviruses. The imino-C-nucleoside BCX4430 shows broad-spectrum antiviral activity against a wide range of RNA viruses. Here, we demonstrate that BCX4430 inhibits tick-borne species of the genus Flavivirus; however, the antiviral effect varies against individual species. Micro-molar BCX4430 levels inhibited tick-borne encephalitis virus (TBEV); while, approximately 3-8-fold higher concentrations were needed to inhibit louping ill virus and Kyasanur Forest disease virus...
March 21, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28333618/increasing-evidence-of-tick-borne-encephalitis-tbe-virus-transmission-the-netherlands-june-2016
#5
Adriaan Cg Weststrate, Daan Knapen, Gozewijn D Laverman, Bart Schot, Jan Jw Prick, Silke A Spit, Johan Reimerink, Barry Rockx, Felix Geeraedts
We present a case of endemic tick-borne encephalitis (TBE) occurring in June 2016 in the eastern part of the Netherlands in an area where a strain of TBE virus, genetically different from the common TBE virus strains in Europe, was reported in ticks in 2016. With the start of the tick season in spring, this second autochthonous Dutch TBE case should remind physicians to consider the possibility of endemic TBE in patients with respective symptoms.
March 16, 2017: Euro Surveillance: Bulletin Européen sur les Maladies Transmissibles, European Communicable Disease Bulletin
https://www.readbyqxmd.com/read/28261565/borrelia-diversity-and-co-infection-with-other-tick-borne-pathogens-in-ticks
#6
Cristian Raileanu, Sara Moutailler, Ionuţ Pavel, Daniela Porea, Andrei D Mihalca, Gheorghe Savuta, Muriel Vayssier-Taussat
Identifying Borrelia burgdorferi as the causative agent of Lyme disease in 1981 was a watershed moment in understanding the major impact that tick-borne zoonoses can have on public health worldwide, particularly in Europe and the USA. The medical importance of tick-borne diseases has long since been acknowledged, yet little is known regarding the occurrence of emerging tick-borne pathogens such as Borrelia spp., Anaplasma phagocytophilum, Rickettsia spp., Bartonella spp., "Candidatus Neoehrlichia mikurensis", and tick-borne encephalitis virus in questing ticks in Romania, a gateway into Europe...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28259789/evaluation-of-a-serological-test-for-the-diagnosis-of-borrelia-miyamotoi-disease-in-europe
#7
Setareh Jahfari, Denis S Sarksyan, Nadezda M Kolyasnikova, Joppe W Hovius, Hein Sprong, Alexander E Platonov
BACKGROUND: Borrelia miyamotoi causes systemic febrile illness and is transmitted by the same tick species that transmits Borrelia burgdorferi sensu lato and tick-borne encephalitis virus. We describe a serological test using a fragment of glycerophosphodiester phosphodiesterase (GlpQ) as an antigen, and determined its performance in well-defined patient categories. METHODS: Serum of patients with PCR-confirmed Borrelia miyamotoi disease (BMD), Lyme borreliosis (LB), tick-borne encephalitis (TBE), and healthy blood donors (HBD) were collected in Udmurt Republic, Russia...
March 1, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28229397/emerging-causes-of-arbovirus-encephalitis-in-north-america-powassan-chikungunya-and-zika-viruses
#8
REVIEW
Christopher T Doughty, Sigal Yawetz, Jennifer Lyons
Arboviruses are arthropod-borne viruses transmitted by the bite of mosquitoes, ticks, or other arthropods. Arboviruses are a common and an increasing cause of human illness in North America. Powassan virus, Chikungunya virus, and Zika virus are arboviruses that have all recently emerged as increasing causes of neurologic illness. Powassan virus almost exclusively causes encephalitis, but cases are rare, sporadic, and restricted to portions of North America and Russia. Chikungunya virus has spread widely across the world, causing millions of infections...
February 2017: Current Neurology and Neuroscience Reports
https://www.readbyqxmd.com/read/28221100/intracellular-degradation-and-localization-of-ns1-of-tick-borne-encephalitis-virus-affect-its-protective-properties
#9
Yulia V Kuzmenko, Elizaveta S Starodubova, Anastasia S Shevtsova, Liubov L Chernokhaeva, Anastasia A Latanova, Olga V Preobrazhenskaia, Andrey V Timofeev, Galina G Karganova, Vadim L Karpov
Currently, many DNA vaccines against infectious diseases are in clinical trials; however, their efficacy needs to be improved. The potency of DNA immunogen can be optimized by targeting technologies. In the current study, to increase the efficacy of NS1 encoded by plasmid, proteasome targeting was applied. NS1 variants with or without translocation sequence and with ornithine decarboxylase as a signal of proteasomal degradation were tested for expression, localization, protein turnover, proteasomal degradation and protection properties...
January 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28220327/genetic-characterization-of-cacipacor%C3%A3-virus-from-ticks-collected-in-s%C3%A3-o-paulo-state-brazil
#10
Glauciane Garcia de Figueiredo, Alberto Anastacio Amarilla, William Marciel de Souza, Marcílio Jorge Fumagalli, Mário Luis Garcia de Figueiredo, Matias Pablo Juan Szabó, Soraya Jabur Badra, Yin Xiang Setoh, Alexander A Khromykh, Victor Hugo Aquino, Luiz Tadeu Moraes Figueiredo
Cacipacoré virus (CPCV) is a potential emerging virus classified in the genus Flavivirus, family Flaviviridae. In the present study, we present the genetic characterization of a CPCV isolated from ticks (Amblyomma cajennense) collected from a sick capybara (Hydrochoerus hydrochaeris) in São Paulo State, Brazil. The CPCV isolate shares the typical genomic organization of flaviviruses with 10,857 nucleotides in length and a single open reading frame of 10,284 nucleotides encoding a polyprotein of 3,427 amino acids...
February 20, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28213810/how-to-tackle-natural-focal-infections-from-risk-assessment-to-vaccination-strategies
#11
Luca Busani, Alexander E Platonov, Onder Ergonul, Giovanni Rezza
Natural focal diseases are caused by biological agents associated with specific landscapes. The natural focus of such diseases is defined as any natural ecosystem containing the pathogen's population as an essential component. In such context, the agent circulates independently on human presence, and humans may become accidentally infected through contact with vectors or reservoirs. Some viruses (i.e., tick-borne encephalitis and Congo-Crimean hemorrhagic fever virus) are paradigmatic examples of natural focal diseases...
February 18, 2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28202075/tick-borne-pathogens-induce-differential-expression-of-genes-promoting-cell-survival-and-host-resistance-in-ixodes-ricinus-cells
#12
Karen L Mansfield, Charlotte Cook, Richard J Ellis, Lesley Bell-Sakyi, Nicholas Johnson, Pilar Alberdi, José de la Fuente, Anthony R Fooks
BACKGROUND: There has been an emergence and expansion of tick-borne diseases in Europe, Asia and North America in recent years, including Lyme disease, tick-borne encephalitis and human anaplasmosis. The primary vectors implicated are hard ticks of the genus Ixodes. Although much is known about the host response to these bacterial and viral pathogens, there is limited knowledge of the cellular responses to infection within the tick vector. The bacterium Anaplasma phagocytophilum is able to bypass apoptotic processes in ticks, enabling infection to proceed...
February 15, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28179396/the-antigenic-structure-of-zika-virus-and-its-relation-to-other-flaviviruses-implications-for-infection-and-immunoprophylaxis
#13
REVIEW
Franz X Heinz, Karin Stiasny
Zika virus was discovered ∼70 years ago in Uganda and maintained a low profile as a human disease agent in Africa and Asia. Only recently has it caused explosive outbreaks in previously unaffected regions, first in Oceania and then in the Americas since 2015. Of special concern is the newly identified link between congenital malformations (especially microcephaly) and Zika virus infections during pregnancy. At present, it is unclear whether Zika virus changed its pathogenicity or whether the huge number of infections allowed the recognition of a previously cryptic pathogenic property...
March 2017: Microbiology and Molecular Biology Reviews: MMBR
https://www.readbyqxmd.com/read/28170029/a-cluster-of-fatal-tick-borne-encephalitis-virus-infection-in-organ-transplant-setting
#14
Dariusz Lipowski, Marta Szablowska, Karol Perlejewski, Shota Nakamura, Iwona Bukowska-Ośko, Ewa Rzadkiewicz, Tomasz Dzieciątkowski, Anna Milecka, Wojciech Wenski, Michał Ciszek, Alicja Dębska-Ślizień, Ewa Ignacak, Kamila Caraballo Cortes, Agnieszka Pawełczyk, Andrzej Horban, Marek Radkowski, Tomasz Laskus
No abstract text is available yet for this article.
February 7, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28167278/the-host-cell-response-to-tick-borne-encephalitis-virus
#15
Tea Carletti, Mohammad Khalid Zakaria, Alessandro Marcello
Tick-borne encephalitis virus is the most prevalent autochthonous arbovirus in Europe and an important travel-associated virus. Complications of the infection could lead to lethal encephalitis in susceptible individuals. However, despite its clinical relevance and expanding geographical distribution, most of our knowledge on its pathogenesis is inferred from studies on other flaviviruses. Molecular details of the host cell response to infection are scarce leading to a poor understanding of the antiviral pathways and viral countermeasures that are critical to determine the outcome of the infection...
February 4, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28159412/new-tools-in-nucleoside-toolbox-of-tick-borne-encephalitis-virus-reproduction-inhibitors
#16
Alexey A Orlov, Mikhail S Drenichev, Vladimir E Oslovsky, Nikolay N Kurochkin, Pavel N Solyev, Liubov I Kozlovskaya, Vladimir A Palyulin, Galina G Karganova, Sergey N Mikhailov, Dmitry I Osolodkin
Design and development of nucleoside analogs is an established strategy in the antiviral drug discovery field. Nevertheless, for many viruses the coverage of structure-activity relationships (SAR) in the nucleoside chemical space is not sufficient. Here we present the nucleoside SAR exploration for tick-borne encephalitis virus (TBEV), a member of Flavivirus genus. Promising antiviral activity may be achieved by introduction of large hydrophobic substituents in the position 6 of adenosine or bulky silyl groups to the position 5'...
January 14, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28153343/tick-borne-encephalitis-in-china-a-review-of-epidemiology-and-vaccines
#17
REVIEW
Yi Xing, Heinz-Josef Schmitt, Adriano Arguedas, Junfeng Yang
Tick-borne encephalitis (TBE) has been shown to be endemic in northern and western China, including the three mountain areas in Heilongjiang, Jilin, Inner Mongolia, and Xinjiang. In addition, serology evidence shows that there is human infection in south-west provinces of China, including Xizang (Tibet) and Yunnan. TBE in China is caused by the Far Eastern TBE virus subtype and there is no biphasic course for disease presentation. The majority of TBE cases in China have occurred in people who were living or working in forests...
January 30, 2017: Vaccine
https://www.readbyqxmd.com/read/28153052/distribution-and-molecular-characteristics-of-rickettsiae-found-in-ticks-across-central-mongolia
#18
Bazartseren Boldbaatar, Rui-Ruo Jiang, Michael E von Fricken, Sukhbaatar Lkhagvatseren, Pagbajab Nymadawa, Bekhochir Baigalmaa, Ya-Wei Wang, Benjamin D Anderson, Jia-Fu Jiang, Gregory C Gray
BACKGROUND: Little is known regarding tick-borne diseases in Mongolia, despite having 26% of the population still living nomadic pastoral lifestyles. A total of 1497 adult unfed ticks: 261 Ixodes persulcatus, 795 Dermacentor nuttalli, and 441 Hyalomma asiaticum, were collected from three ecologically distinct regions in Central Mongolia. Tick pools (n = 299) containing ~5 ticks each, were tested for Rickettsia and Tick-borne encephalitis virus (TBEV) using nested polymerase chain reaction, reverse transcription-PCR, and quantitative real-time RT-PCR...
February 2, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28143786/compliance-with-vaccination-against-tick-borne-encephalitis-virus-in-germany
#19
Louis Jacob, Karel Kostev
OBJECTIVES: The goal of this study was to analyze patients' compliance with vaccination against Tick-borne encephalitis (TBE) virus in Germany. METHODS: The present study included 7,266 patients from 638 general practices and 4,194 patients from 114 pediatric practices. Patients were included if they had received the first dose of one of two vaccines against TBE virus (FSME-Immune® and Encepur®). The immunization schedule of these vaccines consisted of three injections...
January 28, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28141800/modeling-powassan-virus-infection-in-peromyscus-leucopus-a-natural-host
#20
Luwanika Mlera, Kimberly Meade-White, Greg Saturday, Dana Scott, Marshall E Bloom
The tick-borne flavivirus, Powassan virus (POWV) causes life-threatening encephalitis in humans in North America and Europe. POWV is transmitted by ixodid tick vectors that feed on small to medium-sized mammals, such as Peromyscus leucopus mice, which may serve as either reservoir, bridge or amplification hosts. Intraperitoneal and intracranial inoculation of 4-week old Peromyscus leucopus mice with 103 PFU of POWV did not result in overt clinical signs of disease. However, following intracranial inoculation, infected mice seroconverted to POWV and histopathological examinations revealed that the mice uniformly developed mild lymphocytic perivascular cuffing and microgliosis in the brain and spinal cord from 5 to 15 days post infection (dpi), suggesting an early inflammatory response...
January 2017: PLoS Neglected Tropical Diseases
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