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https://www.readbyqxmd.com/read/28628828/sensitivity-to-bst-2-restriction-correlates-with-orthobunyavirus-host-range
#1
Mariana Varela, Ilaria M Piras, Catrina Mullan, Xiaohong Shi, Natasha L Tilston-Lunel, Rute Maria Pinto, Aislynn Taggart, Stephen R Welch, Stuart J D Neil, Felix Kreher, Richard M Elliott, Massimo Palmarini
Orthobunyaviruses include several recently emerging viruses of significant medical and veterinary importance. There is currently very limited understanding on what determines the host species range of these pathogens. In this study we discovered that BST-2/tetherin restricts orthobunyavirus replication in a host-specific manner. We show that viruses with human tropism (Oropouche virus and La Crosse virus) are restricted by sheep BST-2 but not by the human orthologue, while viruses with ruminant tropism (Schmallenberg virus and others) are restricted by human BST-2 but not by the sheep orthologue...
June 16, 2017: Virology
https://www.readbyqxmd.com/read/28626191/hemophagocytic-lymphohistiocytosis-in-a-fatal-case-of-severe-fever-with-thrombocytopenia-syndrome
#2
Ayako Nakano, Hirohisa Ogawa, Yoshinori Nakanishi, Hiromi Fujita, Fumihiko Mahara, Kazuya Shiogama, Yutaka Tsutsumi, Toshiaki Takeichi
Severe fever with thrombocytopenia syndrome (SFTS) is an emerging disease caused by a novel Bunyavirus with a high mortality rate. We herein report a fatal case of an 86-year-old woman with SFTS complaining of a fever, fatigue, and bicytopenia. Her condition deteriorated with rapid progression of bleeding tendency, disturbance of consciousness, and multiple organ failure leading to death on Day 6 of her illness. The histopathological findings in the autopsy revealed marked infiltration of macrophages with hemophagocytosis in the bone marrow, liver, and spleen leading to a diagnosis of hemophagocytic lymphohistiocytosis (HLH)...
2017: Internal Medicine
https://www.readbyqxmd.com/read/28592543/mapping-of-transcription-termination-within-the-s-segment-of-sfts-phlebovirus-facilitated-the-generation-of-nss-deletant-viruses
#3
Benjamin Brennan, Veronica V Rezelj, Richard M Elliott
SFTS phlebovirus (severe fever with thrombocytopenia syndrome virus; SFTSV) is an emerging tick-borne bunyavirus that was first reported in China in 2009. Here we report the generation of a recombinant SFTSV (rHB29NSsKO) that cannot express the viral non-structural protein (NSs) upon infection of cells in culture. We show that rHB29NSsKO replication kinetics are greater in interferon (IFN)-incompetent cells and that the virus is unable to suppress IFN induced in response to viral replication. The data confirm for the first time in the context of virus infection that NSs acts as a virally encoded IFN antagonist and that NSs is dispensable for virus replication...
June 7, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28569189/experimental-infections-of-mosquitoes-with-severe-fever-with-thrombocytopenia-syndrome-virus
#4
Shu-Yi Liang, Hong-Liang Chu, Xi-Ling Guo, Wei Wang, Hong-Na Chen, Yu-Fu Zhang, Yin Chen, Tao Wu, Chang-Jun Bao, Ming-Hao Zhou
BACKGROUND: Severe fever with thrombocytopenia syndrome (SFTS) is a newly identified emerging infectious disease, which is caused by a novel bunyavirus (termed SFTSV) in Asia. Although mosquitoes have not been identified as the primary vectors, as revealed by epidemiological surveys, their role in transmitting this SFTSV as a suspicious vector has not been validated. FINDINGS: In this study, we conducted experimental infections of mosquitoes with SFTSV to examine the role of mosquitoes in the transmission of the virus...
June 1, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28560174/pediatric-huaiyangshan-virus-infection-a-case-report-with-literature-review
#5
Chun-Hui Zhu, Dong Xu, Wei Liu, Di Guo, Qin Ning, Guang Chen
To define the clinical manifestations and laboratory characteristics of pediatric severe fever with thrombocytopenia syndrome (SFTS) case caused by a novel bunyavirus. we retrospectively analyzed a pediatric case of viral SFTS in a 13 year old successfully managed and confirmed to be due to the novel bunyavirus now referred to as Huaiyangshan virus. A literature review of related cases was performed.Our pediatric case was a 13.3-year-old middle school student no underlying disease. Major clinical features included a fever with chills, headache, and dizziness...
2017: IDCases
https://www.readbyqxmd.com/read/28555386/molecular-pathogenesis-of-viral-hemorrhagic-fever
#6
REVIEW
Christopher F Basler
The clinical syndrome referred to as viral hemorrhagic fever (VHF) can be caused by several different families of RNA viruses, including select members of the arenaviruses, bunyaviruses, filoviruses, and flaviviruses. VHF is characterized by malaise, fever, vascular permeability, decreased plasma volume, coagulation abnormalities, and varying degrees of hemorrhage. Study of the filovirus Ebola virus has demonstrated a critical role for suppression of innate antiviral defenses in viral pathogenesis. Additionally, antigen-presenting cells are targets of productive infection and immune dysregulation...
May 29, 2017: Seminars in Immunopathology
https://www.readbyqxmd.com/read/28512621/spontaneous-acute-subdural-hemorrhage-in-a-patient-with-a-tick-borne-bunyavirus-induced-severe-fever-with-thrombocytopenia-syndrome
#7
Jihwan Yoo, Ji Woong Oh, Chang Gi Jang, Ju Hyung Moon, Eui-Hyun Kim, Jong Hee Chang, Sun Ho Kim, Seok-Gu Kang
We report the first case of severe fever with thrombocytopenia syndrome (SFTS) and a spontaneous acute subdural hematoma (SDH) in Korea. A 79-year-old male presented with fever and thrombocytopenia. On the third day of hospitalization, his mental changed from drowsy to semi-coma. Brain computed tomography indicated an acute subdural hemorrhage on the right convexity. He was given early decompressive craniectomy, but did not survive. Real-time reverse transcription polymerase chain reaction analysis of a blood sample indicated the presence of SFTS virus (SFTSV)...
April 2017: Korean Journal of Neurotrauma
https://www.readbyqxmd.com/read/28505175/structural-insights-into-reptarenavirus-cap-snatching-machinery
#8
Maria Rosenthal, Nadja Gogrefe, Dominik Vogel, Juan Reguera, Bianka Rauschenberger, Stephen Cusack, Stephan Günther, Sophia Reindl
Cap-snatching was first discovered in influenza virus. Structures of the involved domains of the influenza virus polymerase, namely the endonuclease in the PA subunit and the cap-binding domain in the PB2 subunit, have been solved. Cap-snatching endonucleases have also been demonstrated at the very N-terminus of the L proteins of mammarena-, orthobunya-, and hantaviruses. However, a cap-binding domain has not been identified in an arena- or bunyavirus L protein so far. We solved the structure of the 326 C-terminal residues of the L protein of California Academy of Sciences virus (CASV), a reptarenavirus, by X-ray crystallography...
May 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28497117/rna-interference-restricts-rift-valley-fever-virus-in-multiple-insect-systems
#9
Isabelle Dietrich, Stephanie Jansen, Gamou Fall, Stephan Lorenzen, Martin Rudolf, Katrin Huber, Anna Heitmann, Sabine Schicht, El Hadji Ndiaye, Mick Watson, Ilaria Castelli, Benjamin Brennan, Richard M Elliott, Mawlouth Diallo, Amadou A Sall, Anna-Bella Failloux, Esther Schnettler, Alain Kohl, Stefanie C Becker
The emerging bunyavirus Rift Valley fever virus (RVFV) is transmitted to humans and livestock by a large number of mosquito species. RNA interference (RNAi) has been characterized as an important innate immune defense mechanism used by mosquitoes to limit replication of positive-sense RNA flaviviruses and togaviruses; however, little is known about its role against negative-strand RNA viruses such as RVFV. We show that virus-specific small RNAs are produced in infected mosquito cells, in Drosophila melanogaster cells, and, most importantly, also in RVFV vector mosquitoes...
May 2017: MSphere
https://www.readbyqxmd.com/read/28496029/a-newly-established-severity-scoring-system-in-predicting-the-prognosis-of-patients-with-severe-fever-with-thrombocytopenia-syndrome
#10
Bo Yang, Xiaoli Wang, Yaping Li, Anzhao Wu, Qian Liu, Yuyin Lu, Chengmin Yuan, Mingming Wang
Severe fever with thrombocytopenia syndrome (SFTS) is an emerging infectious disease caused by novel Bunyavirus. Due to the peculiarity of SFTS, accurate assessment is difficult to achieve with the current score systems. This study aimed to establish a new severity scoring system in predicting the prognosis of patients with SFTS. We included 123 patients with SFTS: 92 patients (45 males and 47 females), aged 59 ± 12 years, in survive group and 31 patients (17 males and 14 females), aged 61 ± 10 years, in death group...
May 2017: Tohoku Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28479064/detection-of-a-novel-putative-phlebovirus-and-first-isolation-of-dugbe-virus-from-ticks-in-accra-ghana
#11
Daisuke Kobayashi, Mitsuko Ohashi, Joseph H N Osei, Esinam Agbosu, Millicent Opoku, Alfred Agbekudzi, Joannitta Joannides, Ryosuke Fujita, Toshinori Sasaki, J H Kofi Bonney, Samuel Dadzie, Haruhiko Isawa, Kyoko Sawabe, Nobuo Ohta
Ticks are ectoparasites that transmit various types of human and animal pathogens. In particular, emerging and re-emerging diseases caused by tick-borne viruses are public health concerns around the world. However, in many countries of the sub-Saharan African region, epidemiological information on tick-borne viral infections is limited, and their prevalence and distribution remain largely unknown. In this study, we conducted surveillance on ticks to detect medically important tick-borne bunyaviruses in three study sites in and near to Accra, the capital city of Ghana, in 2015...
April 23, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28418734/bunyaviridae-rdrps-structure-motifs-and-rna-synthesis-machinery
#12
Abdennour Amroun, Stéphane Priet, Xavier de Lamballerie, Gilles Quérat
Bunyaviridae family is the largest and most diverse family of RNA viruses. It has more than 350 members divided into five genera: Orthobunyavirus, Phlebovirus, Nairovirus, Hantavirus, and Tospovirus. They are present in the five continents, causing recurrent epidemics, epizootics, and considerable agricultural loss. The genome of bunyaviruses is divided into three segments of negative single-stranded RNA according to their relative size: L (Large), M (Medium) and S (Small) segment. Bunyaviridae RNA-dependent RNA polymerase (RdRp) is encoded by the L segment, and is in charge of the replication and transcription of the viral RNA in the cytoplasm of the infected cell...
April 18, 2017: Critical Reviews in Microbiology
https://www.readbyqxmd.com/read/28399161/seroprevalence-of-severe-fever-with-thrombocytopenia-syndrome-virus-in-china-a-systematic-review-and-meta-analysis
#13
Peng Li, Zhen-Dong Tong, Ke-Feng Li, An Tang, Ya-Xin Dai, Jian-Bo Yan
OBJECTIVE: Severe fever with thrombocytopenia syndrome (SFTS) is an emerging infectious disease caused by a novel bunyavirus-SFTSV. The seroprevalence of anti-SFTSV antibodies including immunoglobulin G (IgG) and immunoglobulin M (IgM), specific to SFTSV in the general population has been investigated in various epidemiological studies with inconsistent results. Here, we clarify this discrepancy and reach a more comprehensive result by mean of a meta-analysis. METHODS: All relevant articles were searched in the electronic databases (PubMed, Web of science, Embase, Chinese National Knowledge Infrastructure database, Chinese Wanfang database) up to November 2016...
2017: PloS One
https://www.readbyqxmd.com/read/28388693/a-role-for-glycolipid-biosynthesis-in-severe-fever-with-thrombocytopenia-syndrome-virus-entry
#14
Mary Jane Drake, Benjamin Brennan, Kenneth Briley, Stephen M Bart, Eric Sherman, Agnieszka M Szemiel, Madeleine Minutillo, Frederic D Bushman, Paul Bates
A novel bunyavirus was recently found to cause severe febrile illness with high mortality in agricultural regions of China, Japan, and South Korea. This virus, named severe fever with thrombocytopenia syndrome virus (SFTSV), represents a new group within the Phlebovirus genus of the Bunyaviridae. Little is known about the viral entry requirements beyond showing dependence on dynamin and endosomal acidification. A haploid forward genetic screen was performed to identify host cell requirements for SFTSV entry...
April 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28323557/seroprevalence-of-severe-fever-with-thrombocytopenia-syndrome-virus-in-hedgehog-from-china
#15
Yue Sun, Miao-Miao Liu, Li-Mei Luo, Li Zhao, Hong-Ling Wen, Zhen-Tang Zhang, Jian-Wei Liu, Zai-Feng Xue, Dong-Qiang Ma, Shu-Jun Ding, Xiao-Ying Lei, Xue-Jie Yu
Severe fever with thrombocytopenia syndrome, an emerging hemorrhagic fever, is caused by severe fever with thrombocytopenia syndrome virus (SFTSV), a tick-borne bunyavirus. Information regarding SFTSV animal hosts is very limited. In this study, we showed that 64% (9/14) of hedgehogs in Shandong Province, China were seropositive to SFTSV antibody, suggesting that hedgehog could be a vertebrate parasitifer for SFTSV.
May 2017: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/28251516/isolation-characterization-and-phylogenic-analysis-of-three-new-severe-fever-with-thrombocytopenia-syndrome-bunyavirus-strains-derived-from-hubei-province-china
#16
Yanfang Zhang, Shu Shen, Junming Shi, Zhengyuan Su, Mingyue Li, Wenjing Zhang, Mengmeng Li, Zhihong Hu, Cheng Peng, Xin Zheng, Fei Deng
Hubei Province is a major epidemic area of severe fever with thrombocytopenia syndrome bunyavirus (SFTSV) in China. However, to date, a few SFTSV strains have been isolated from Hubei Province, preventing effective studies of epidemic outbreaks. Here, we report three confirmed patients (2015-2016) with typical symptoms of severe fever with thrombocytopenia syndrome disease (SFTS) who were farmers resident in different regions in Hubei Province. Three new SFTSV strains were isolated from the serum samples of each patient...
February 2017: Virologica Sinica
https://www.readbyqxmd.com/read/28250124/immunization-with-dna-plasmids-coding-for-crimean-congo-hemorrhagic-fever-virus-capsid-and-envelope-proteins-and-or-virus-like-particles-induces-protection-and-survival-in-challenged-mice
#17
Jorma Hinkula, Stéphanie Devignot, Sara Åkerström, Helen Karlberg, Eva Wattrang, Sándor Bereczky, Mehrdad Mousavi-Jazi, Christian Risinger, Gunnel Lindegren, Caroline Vernersson, Janusz Paweska, Petrus Jansen van Vuren, Ola Blixt, Alejandro Brun, Friedemann Weber, Ali Mirazimi
Crimean-Congo hemorrhagic fever virus (CCHFV) is a bunyavirus causing severe hemorrhagic fever disease in humans, with high mortality rates. The requirement of a high-containment laboratory and the lack of an animal model hampered the study of the immune response and protection of vaccine candidates. Using the recently developed interferon alpha receptor knockout (IFNAR(-/-)) mouse model, which replicates human disease, we investigated the immunogenicity and protection of two novel CCHFV vaccine candidates: a DNA vaccine encoding a ubiquitin-linked version of CCHFV Gc, Gn, and N and one using transcriptionally competent virus-like particles (tc-VLPs)...
May 15, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28243938/hemorrhagic-fever-of-bunyavirus-etiology-disease-models-and-progress-towards-new-therapies
#18
REVIEW
Brian B Gowen, Brady T Hickerson
A growing number of bunyaviruses are known to cause viral hemorrhagic fever (VHF), a severe febrile illness which can progress to hypovolemic shock and multi-organ failure and is characterized by hematologic abnormalities and vascular leak. At present, there are no approved vaccines or antiviral therapies to effectively prevent or treat VHF caused by pathogenic bunyaviruses. Advances in the modeling of bunyaviral infections have facilitated efforts towards the development of novel post-exposure prophylactic and therapeutic countermeasures, several of which may some day be approved for human use...
March 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28235558/dna-vaccination-regimes-against-schmallenberg-virus-infection-in-ifnar-mice-suggest-two-targets-for-immunization
#19
Hani Y Boshra, Diego Charro, Gema Lorenzo, Isbene Sánchez, Beatriz Lazaro, Alejandro Brun, Nicola G A Abrescia
Schmallenberg virus (SBV) is an RNA virus of the Bunyaviridae family, genus Orthobunyavirus that infects wild and livestock species of ruminants. While inactivated and attenuated vaccines have been shown to prevent SBV infection, little is known about their mode of immunity; specifically, which components of the virus are responsible for inducing immunological responses in the host. As previous DNA vaccination experiments on other bunyaviruses have found that glycoproteins, as well as modified (i.e. ubiquitinated) nucleoproteins (N) can confer immunity against virulent viral challenge, constructs encoding for fragments of SBV glycoproteins GN and GC, as well as ubiquitinated and non-ubiquitinated N were cloned in mammalian expression vectors, and vaccinated intramuscularly in IFNAR(-/-) mice...
February 21, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28209840/genome-sequences-of-three-novel-bunyaviruses-two-novel-rhabdoviruses-and-one-novel-nyamivirus-from-washington-state-moths
#20
Negar Makhsous, Ryan C Shean, David Droppers, Jonathan Guan, Keith R Jerome, Alexander L Greninger
We report draft genome sequences of three novel bunyaviruses, two novel rhabdoviruses, and one novel nyamivirus identified metagenomically from 10 moths in Washington state.
February 16, 2017: Genome Announcements
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