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Hemorrhagic Fever viruses

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https://www.readbyqxmd.com/read/28722609/differences-in-mortality-and-clinical-manifestations-of-dengue-hemorrhagic-fever-in-taiwan-in-different-years-a-comparison-for-cases-in-2014-and-2015-epidemics
#1
Ko Chang, Chung-Hao Huang, Ing-Kit Lee, Po-Liang Lu, Chun-Yu Lin, Tun-Chieh Chen, Ping-Chang Lai, Hsiao-Cheng Hsieh, Hsin-Liang Yu, Chih-Hsing Hung, Meng-Chieh Wu, Yi-Ying Chin, Chun-Chi Huang, Deng-Chyang Wu, Yen-Hsu Chen
People in southern Taiwan experienced two major dengue outbreaks in 2014 and 2015. The mortality and clinical features were very different between these 2 years. Dengue virus serotype 1 (DENV-1) caused epidemic outbreak in 2014 and DENV-2 was predominant in 2015. The characteristics of dengue hemorrhagic fever (DHF) cases in the 2 years was analyzed. We conducted a retrospective chart review to analyze the clinical and laboratory features of 206 adult patients with DHF in southern Taiwan in 2014 and 2015. The mortality rate of DHF cases in 2015 was higher than that of cases in 2014 (38...
June 12, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28720142/comparison-of-serological-assays-to-titrate-hantaan-and-seoul-hantavirus-specific-antibodies
#2
Weihong Li, Shouchun Cao, Quanfu Zhang, Jiandong Li, Shuo Zhang, Wei Wu, Jing Qu, Chuan Li, Mifang Liang, Dexin Li
BACKGROUND: Hantaan and Seoul viruses, in the Hantavirus genus, are known to cause hemorrhagic fever with renal syndrome (HFRS). The plaque reduction neutralization test (PRNT), as conventional neutralization test for hantaviruses, is laborious and time-consuming. Alternatives to PRNT for hantaviruses are required. METHODS: In this study, the methods for Hantaan and Seoul viruses serological typing including microneutralization test (MNT), pseudoparticle neutralization test (PPNT) and immunofluorescence assay based on viral glycoproteins (IFA-GP) were developed and compared with PRNT using a panel of 74 sera including 44 convalescent sera of laboratory confirmed HFRS patients and 30 patients sera of non-hantavirus infection...
July 18, 2017: Virology Journal
https://www.readbyqxmd.com/read/28719259/serosurvey-of-crimean-congo-hemorrhagic-fever-virus-in-cattle-mali-west-africa
#3
Ousmane Maiga, Miriam Andrada Sas, Kyle Rosenke, Badian Kamissoko, Marc Mertens, Nafomon Sogoba, Abdallah Traore, Modibo Sangare, Mamadou Niang, Tom G Schwan, Hamidou Moussa Maiga, Sekou F Traore, Heinz Feldmann, David Safronetz, Martin H Groschup
AbstractCrimean-Congo hemorrhagic fever is a tick-borne disease caused by the arbovirus Crimean-Congo hemorrhagic fever virus (CCHFV, family Bunyaviridae, genus Nairovirus). CCHFV can cause a severe hemorrhagic fever with high-case fatality rates in humans. CCHFV has a wide geographic range and has been described in around 30 countries in the Middle East, Asia, Europe, and Africa including Mali and neighboring countries. To date, little is known about the prevalence rates of CCHFV in Mali. Here, using banked bovine serum samples from across the country, we describe the results of a seroepidemiological study for CCHFV aimed at identifying regions of circulation in Mali...
June 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28712556/serosurvey-for-crimean-congo-hemorrhagic-fever-virus-infections-in-ruminants-in-katanga-province-democratic-republic-of-the-congo
#4
Miriam A Sas, Marc Mertens, Jean G Kadiat, Isolde Schuster, Célestin P S Pongombo, Alois G K Maloba, Martin H Groschup
Crimean-Congo hemorrhagic fever virus (CCHFV) has been detected in many African countries. Unfortunately, little is known about the current CCHFV situation in most of those countries including the Democratic Republic of the Congo (DRC). In over 50 years, three human CCHF cases have been detected in DRC but no seroepidemiological investigation was performed so far. To determine the prevalence of CCHFV-specific antibodies we tested 838 serum samples of cattle, goat and sheep from the southern province Katanga, DRC...
July 3, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28710265/francisella-like-endosymbionts-and-rickettsia-species-in-local-and-imported-hyalomma-ticks
#5
Tal Azagi, Eyal Klement, Gidon Perlman, Yaniv Lustig, Kosta Y Mumcuoglu, Dmitry Apanaskevich, Yuval Gottlieb
Hyalomma ticks (Acari: Ixodidae) are hosts for Francisella like endosymbionts (FLE) and may serve as vectors of zoonotic disease agents. This study was aimed to provide initial characterization of the interaction between Hyalomma and FLE and to determine the prevalence of pathogenic Rickettsia in these ticks. Hyalomma marginatum, H. rufipes, H. dromedarii, H. aegyptium and H. excavatum ticks, identified morphologically and molecularly, were collected from different hosts and locations, representing the genus distribution in Israel, as well as from migratory birds...
July 14, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28709136/tetracyclines-as-a-potential-antiviral-therapy-against-crimean-congo-hemorrhagic-fever-virus-docking-and-molecular-dynamic-studies
#6
Amirhossein Sharifi, Arash Amanlou, Faezeh Moosavi-Movahedi, Sahand Golestanian, Massoud Amanlou
Crimean-Congo Hemorrhagic Fever Virus (CCHFV) is one of the deadliest human diseases with mortality rate near 50%. Special attention should be paid to this virus since there is no approved treatment for it. On the other hand, the recent outbreak of Ebola virus which is a member of hemorrhagic fever viruses shows this group of viruses can be extremely dangerous. Previous studies have indicated that nucleoprotein of CCHFV, a pivotal protein in virus replication, is an appropriate target for antiviral drug development...
July 1, 2017: Computational Biology and Chemistry
https://www.readbyqxmd.com/read/28705183/generic-amplification-and-next-generation-sequencing-reveal-crimean-congo-hemorrhagic-fever-virus-ap92-like-strain-and-distinct-tick-phleboviruses-in-anatolia-turkey
#7
Ender Dinçer, Annika Brinkmann, Olcay Hekimoğlu, Sabri Hacıoğlu, Katalin Földes, Zeynep Karapınar, Pelin Fatoş Polat, Bekir Oğuz, Özlem Orunç Kılınç, Peter Hagedorn, Nurdan Özer, Aykut Özkul, Andreas Nitsche, Koray Ergünay
BACKGROUND: Ticks are involved with the transmission of several viruses with significant health impact. As incidences of tick-borne viral infections are rising, several novel and divergent tick- associated viruses have recently been documented to exist and circulate worldwide. This study was performed as a cross-sectional screening for all major tick-borne viruses in several regions in Turkey. Next generation sequencing (NGS) was employed for virus genome characterization. Ticks were collected at 43 locations in 14 provinces across the Aegean, Thrace, Mediterranean, Black Sea, central, southern and eastern regions of Anatolia during 2014-2016...
July 14, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28700843/autochthonous-crimean-congo-hemorrhagic-fever-in-spain
#8
Anabel Negredo, Fernando de la Calle-Prieto, Eduardo Palencia-Herrejón, Marta Mora-Rillo, Jenaro Astray-Mochales, María P Sánchez-Seco, Esther Bermejo Lopez, Javier Menárguez, Ana Fernández-Cruz, Beatriz Sánchez-Artola, Elena Keough-Delgado, Eva Ramírez de Arellano, Fátima Lasala, Jakob Milla, Jose L Fraile, Maria Ordobás Gavín, Amalia Martinez de la Gándara, Lorenzo López Perez, Domingo Diaz-Diaz, M Aurora López-García, Pilar Delgado-Jimenez, Alejandro Martín-Quirós, Elena Trigo, Juan C Figueira, Jesús Manzanares, Elena Rodriguez-Baena, Luis Garcia-Comas, Olaia Rodríguez-Fraga, Nicolás García-Arenzana, Maria V Fernández-Díaz, Victor M Cornejo, Petra Emmerich, Jonas Schmidt-Chanasit, Jose R Arribas
Crimean-Congo hemorrhagic fever (CCHF) is a widely distributed, viral, tickborne disease. In Europe, cases have been reported only in the southeastern part of the continent. We report two autochthonous cases in Spain. The index patient acquired the disease through a tick bite in the province of Ávila - 300 km away from the province of Cáceres, where viral RNA from ticks was amplified in 2010. The second patient was a nurse who became infected while caring for the index patient. Both were infected with the African 3 lineage of this virus...
July 13, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/28686617/dengue-virus-specific-igy-provides-protection-following-lethal-dengue-virus-challenge-and-is-neutralizing-in-the-absence-of-inducing-antibody-dependent-enhancement
#9
Ashley L Fink, Katherine L Williams, Eva Harris, Travis D Alvine, Thomas Henderson, James Schiltz, Matthew L Nilles, David S Bradley
Dengue hemorrhagic fever (DHF) and dengue shock syndrome (DSS) are severe disease manifestations that can occur following sequential infection with different dengue virus serotypes (DENV1-4). At present, there are no licensed therapies to treat DENV-induced disease. DHF and DSS are thought to be mediated by serotype cross-reactive antibodies that facilitate antibody-dependent enhancement (ADE) by binding to viral antigens and then Fcγ receptors (FcγR) on target myeloid cells. Using genetically engineered DENV-specific antibodies, it has been shown that the interaction between the Fc portion of serotype cross-reactive antibodies and FcγR is required to induce ADE...
July 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28680856/sertoli-cells-are-susceptible-to-zikv-infection-in-mouse-testis
#10
Zi-Yang Sheng, Na Gao, Zhao-Yang Wang, Xiao-Yun Cui, De-Shan Zhou, Dong-Ying Fan, Hui Chen, Pei-Gang Wang, Jing An
Flaviviruses including Dengue virus (DENV), Yellow fever virus (YFV), West Nile virus (WNV), and Japanese encephalitis virus (JEV) are global health problems that caused several serious diseases such as fever, hemorrhagic fever, and encephalitis in the past century. Recently, Zika virus (ZIKV) which spreads from Asia to American and causes millions of infections emerges as a new dangerous member of the genus of Flavivirus. Unlike other well-known flaviviruses, ZIKV can be transmitted sexually and infect testes in murine models...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28680057/an-attenuated-machupo-virus-with-a-disrupted-l-segment-intergenic-region-protects-guinea-pigs-against-lethal-guanarito-virus-infection
#11
Joseph W Golden, Brett Beitzel, Jason T Ladner, Eric M Mucker, Steven A Kwilas, Gustavo Palacios, Jay W Hooper
Machupo virus (MACV) is a New World (NW) arenavirus and causative agent of Bolivian hemorrhagic fever (HF). Here, we identified a variant of MACV strain Carvallo termed Car(91) that was attenuated in guinea pigs. Infection of guinea pigs with an earlier passage of Carvallo, termed Car(68), resulted in a lethal disease with a 63% mortality rate. Sequencing analysis revealed that compared to Car(68), Car(91) had a 35 nucleotide (nt) deletion and a point mutation within the L-segment intergenic region (IGR), and three silent changes in the polymerase gene that did not impact amino acid coding...
July 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28679761/the-host-e3-ubiquitin-ligase-trim6-ubiquitinates-the-ebola-virus-vp35-protein-and-promotes-virus-replication
#12
Preeti Bharaj, Colm Atkins, Priya Luthra, Maria Isabel Giraldo, Brian E Dawes, Lisa Miorin, Jeffrey R Johnson, Nevan J Krogan, Christopher F Basler, Alexander N Freiberg, Ricardo Rajsbaum
Ebola virus (EBOV), a member of the Filoviridae family, is a highly pathogenic virus that causes severe hemorrhagic fever in humans and is responsible for epidemics throughout sub-Saharan, central and West Africa. The EBOV genome encodes for VP35, an important viral protein involved in virus replication by acting as an essential cofactor of the viral polymerase as well as a potent antagonist of the host antiviral type-I interferon (IFN-I) system. By using mass spectrometry analysis and co-immunoprecipitation assays, we show here that VP35 is ubiquitinated on lysine 309 (K309), a residue located on its IFN antagonist domain...
July 5, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28679759/mutational-analysis-of-lassa-virus-glycoprotein-highlights-regions-required-for-alpha-dystroglycan-utilization
#13
Marissa Acciani, Jacob T Alston, Guohui Zhao, Hayley Reynolds, Afroze M Ali, Brian Xu, Melinda A Brindley
Lassa virus (LASV) is an enveloped RNA virus endemic to West Africa and responsible for severe cases of hemorrhagic fever. Virus entry is mediated by the glycoprotein complex consisting of a stable signal peptide, a receptor-binding subunit GP1, and a viral-host membrane fusion subunit GP2. Several cellular receptors can interact with the GP1 subunit and mediate viral entry, including alpha-dystroglycan (αDG) and lysosomal associated membrane protein 1 (LAMP1). In order to define the regions within GP1 that interact with the cellular receptors, we implemented insertional mutagenesis, carbohydrate shielding, and alanine scanning mutagenesis...
July 5, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28676847/in-cell-western-assays-to-evaluate-hantaan-virus-replication-as-a-novel-approach-to-screen-antiviral-molecules-and-detect-neutralizing-antibody-titers
#14
Hong-Wei Ma, Wei Ye, He-Song Chen, Tie-Jian Nie, Lin-Feng Cheng, Liang Zhang, Pei-Jun Han, Xing-An Wu, Zhi-Kai Xu, Ying-Feng Lei, Fang-Lin Zhang
Hantaviruses encompass rodent-borne zoonotic pathogens that cause severe hemorrhagic fever disease with high mortality rates in humans. Detection of infectious virus titer lays a solid foundation for virology and immunology researches. Canonical methods to assess viral titers rely on visible cytopathic effects (CPE), but Hantaan virus (HTNV, the prototype hantavirus) maintains a relatively sluggish life cycle and does not produce CPE in cell culture. Here, an in-cell Western (ICW) assay was utilized to rapidly measure the expression of viral proteins in infected cells and to establish a novel approach to detect viral titers...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28669005/phylogenetic-analysis-based-on-mitochondrial-dna-sequences-of-wild-rats-and-the-relationship-with-seoul-virus-infection-in-hubei-china
#15
Dong-Ying Liu, Jing Liu, Bing-Yu Liu, Yuan-Yuan Liu, Hai-Rong Xiong, Wei Hou, Zhan-Qiu Yang
Seoul virus (SEOV), which is predominantly carried by Rattus norvegicus, is one of the major causes of hemorrhagic fever with renal syndrome (HFRS) in China. Hubei province, located in the central south of China, has experienced some of the most severe epidemics of HFRS. To investigate the mitochondrial DNA (mtDNA)-based phylogenetics of wild rats in Hubei, and the relationship with SEOV infection, 664 wild rats were captured from five trapping sites in Hubei from 2000-2009 and 2014-2015. Using reverse-transcription (RT)-PCR, 41 (6...
June 2017: Virologica Sinica
https://www.readbyqxmd.com/read/28653456/detecting-ebola-with-limited-laboratory-access-in-the-democratic-republic-of-congo-evaluation-of-a-clinical-passive-surveillance-reporting-system
#16
Hayley R Ashbaugh, Brandon Kuang, Adva Gadoth, Vivian H Alfonso, Patrick Mukadi, Reena H Doshi, Nicole A Hoff, Cyrus Sinai, Mathias Mossoko, Benoit Ilunga Kebela, Jean-Jacques Muyembe, Emile Okitolonda Wemakoy, Anne W Rimoin
BACKGROUND: Ebola Virus Disease (EVD) can be clinically severe and highly fatal, making surveillance efforts for early disease detection of paramount importance. In areas with limited access to laboratory testing, the Integrated Disease Surveillance and Response (IDSR) strategy in the Democratic Republic of Congo (DRC) may be a vital tool in improving outbreak response. METHODS: Using DRC IDSR data from the nation's four EVD outbreak periods from 2007-2014, we assessed trends of Viral Hemorrhagic Fever (VHF) and EVD differential diagnoses reportable through IDSR...
June 27, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28653186/ebola-virus-disease-in-humans-pathophysiology-and-immunity
#17
César Muñoz-Fontela, Anita K McElroy
Viruses of the Ebolavirus genus cause sporadic epidemics of severe and systemic febrile disease that are fueled by human-to-human transmission. Despite the notoriety of ebolaviruses, particularly Ebola virus (EBOV), as prominent viral hemorrhagic fever agents, and the international concern regarding Ebola virus disease (EVD) outbreaks, very little is known about the pathophysiology of EVD in humans and, in particular, about the human immune correlates of survival and immune memory. This lack of basic knowledge about physiological characteristics of EVD is probably attributable to the dearth of clinical and laboratory data gathered from past outbreaks...
June 27, 2017: Current Topics in Microbiology and Immunology
https://www.readbyqxmd.com/read/28650973/interferon-signaling-in-peromyscus-leucopus-confers-a-potent-and-specific-restriction-to-vector-borne-flaviviruses
#18
Adaeze O Izuogu, Kristin L McNally, Stephen E Harris, Brian H Youseff, John B Presloid, Christopher Burlak, Jason Munshi-South, Sonja M Best, R Travis Taylor
Tick-borne flaviviruses (TBFVs), including Powassan virus and tick-borne encephalitis virus cause encephalitis or hemorrhagic fevers in humans with case-fatality rates ranging from 1-30%. Despite severe disease in humans, TBFV infection of natural rodent hosts has little noticeable effect. Currently, the basis for resistance to disease is not known. We hypothesize that the coevolution of flaviviruses with their respective hosts has shaped the evolution of potent antiviral factors that suppress virus replication and protect the host from lethal infection...
2017: PloS One
https://www.readbyqxmd.com/read/28650708/genetic-polymorphisms-of-tumor-necrosis-factor-alpha-and-susceptibility-to-dengue-virus-infection-in-a-mexican-population
#19
Marina Sánchez-Leyva, Jorge Guillermo Sánchez-Zazueta, Juan Fidel Osuna-Ramos, Horacio Rendón-Aguilar, Rafael Félix-Espinoza, Denisse Stephania Becerra-Loaiza, Dulce Carolina Sánchez-García, José Geovanni Romero-Quintana, Hipolito Castillo Ureta, Ismael Velarde-Rodríguez, Jesús Salvador Velarde-Félix
To evaluate the association of the -308 and -238 tumor necrosis factor alpha (TNF-α) gene polymorphisms with clinical manifestations of dengue and TNF-α serum levels in a northwestern Mexican population. The study populations included dengue fever (DF) and dengue hemorrhagic fever (DHF) patients, and a group of healthy controls (HCs) without history of dengue. Polymerase chain reaction-restriction fragment length polymorphism and Enzyme-Linked Immunosorbent Assay were performed to determine genotypes and serum concentration of TNF-α, respectively...
June 26, 2017: Viral Immunology
https://www.readbyqxmd.com/read/28645623/identification-of-a-coumarin-based-antihistamine-as-an-anti-filoviral-entry-inhibitor
#20
Han Cheng, Adam Schafer, Veronica Soloveva, Dima Gharaibeh, Tara Kenny, Cary Retterer, Rouzbeh Zamani, Sina Bavari, Norton P Peet, Lijun Rong
Filoviruses, consisting of Ebola virus, Marburg virus and Cuevavirus, cause severe hemorrhagic fevers in humans with high mortality rates up to 90%. Currently, there is no approved vaccine or therapy available for the prevention and treatment of filovirus infection in humans. The recent 2013-2015 West African Ebola epidemic underscores the urgency to develop antiviral therapeutics against these infectious diseases. Our previous study showed that GPCR antagonists, particularly histamine receptor antagonists (antihistamines) inhibit Ebola and Marburg virus entry...
June 20, 2017: Antiviral Research
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