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hemorrhagic fever

Pablo Guardado-Calvo, Eduardo A Bignon, Eva Stettner, Scott Allen Jeffers, Jimena Pérez-Vargas, Gerard Pehau-Arnaudet, M Alejandra Tortorici, Jean-Luc Jestin, Patrick England, Nicole D Tischler, Félix A Rey
Hantaviruses are zoonotic viruses transmitted to humans by persistently infected rodents, giving rise to serious outbreaks of hemorrhagic fever with renal syndrome (HFRS) or of hantavirus pulmonary syndrome (HPS), depending on the virus, which are associated with high case fatality rates. There is only limited knowledge about the organization of the viral particles and in particular, about the hantavirus membrane fusion glycoprotein Gc, the function of which is essential for virus entry. We describe here the X-ray structures of Gc from Hantaan virus, the type species hantavirus and responsible for HFRS, both in its neutral pH, monomeric pre-fusion conformation, and in its acidic pH, trimeric post-fusion form...
October 2016: PLoS Pathogens
Jolene Carlson, Vivian O'Donnell, Marialexia Alfano, Lauro Velazquez Salinas, Lauren G Holinka, Peter W Krug, Douglas P Gladue, Stephen Higgs, Manuel V Borca
African swine fever (ASF) is a lethal hemorrhagic disease of swine caused by a double-stranded DNA virus, ASF virus (ASFV). There is no vaccine to prevent the disease and current control measures are limited to culling and restricting animal movement. Swine infected with attenuated strains are protected against challenge with a homologous virulent virus, but there is limited knowledge of the host immune mechanisms generating that protection. Swine infected with Pretoriuskop/96/4 (Pret4) virus develop a fatal severe disease, while a derivative strain lacking virulence-associated gene 9GL (Pret4Δ9GL virus) is completely attenuated...
October 22, 2016: Viruses
Han Xia, Andrew S Beck, Aysen Gargili, Naomi Forrester, Alan D T Barrett, Dennis A Bente
The trade-off hypothesis, the current paradigm of arbovirus evolution, proposes that cycling between vertebrate and invertebrate hosts presents significant constraints on genetic change of arboviruses. Studying these constraints in mosquito-borne viruses has led to a new understanding of epizootics. The trade-off hypothesis is assumed to be applicable to tick-borne viruses too, although studies are lacking. Tick-borne Crimean-Congo hemorrhagic fever virus (CCHFV), a member of the family Bunyaviridae, is a major cause of severe human disease worldwide and shows an extraordinary amount of genetic diversity compared to other arboviruses, which has been linked to increased virulence and emergence in new environments...
October 24, 2016: Scientific Reports
Xuyang Zheng, Chuantao Ye, Jieru Zhao, Peiyu Bian, Ying Zhang, Zhansheng Jia
Objective To observe the alterations of innate immunity related long non-coding RNAs (lncRNAs) in exosomes extracted from the plasma of hemorrhagic fever with renal syndrome (HFRS) patients, and analyze their relationship with the disease stage and severity. Methods Exosomes were extracted from the plasma samples of HFRS patients, healthy controls and recovered HFRS patients. Transmission electronic microscopy and Western blotting were performed to confirm the efficiency of the extraction. lncRNA profiles in the different groups were determined by high-throughput sequencing...
November 2016: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
Sergio Susmallian, Benjamin Raskin, Royi Barnea
INTRODUCTION: Retained surgical sponge or other items in patients' bodies happens more frequently than is reported. Healthcare personnel can forget to remove textile material or instruments during complicated, extended, or emergency surgery. In addition, changes in the operating team can influence the occurrence of such errors. PRESENTATION OF CASE: We present a case with a symptomatic gossypiboma nine years after a previous cesarean section. A 34-year-old woman was admitted to the emergency room having experienced abdominal pain and fever for the previous month...
October 14, 2016: International Journal of Surgery Case Reports
Yu-Ting Huang, Li Zhao, Hong-Ling Wen, Yi Yang, Hao Yu, Xue-Jie Yu
Severe fever with thrombocytopenia syndrome is an emerging hemorrhagic fever disease in eastern Asia, caused by a tickborne bunyavirus. Of 25 patients hospitalized with this disease in China, 100% produced and maintained neutralizing antibodies to severe fever with thrombocytopenia syndrome virus for the study period of 4 years.
November 2016: Emerging Infectious Diseases
Lisai Zhu, Haibing Lu, Yufeng Cao, Xiaochun Gai, Changming Guo, Yajing Liu, Jiaxu Liu, Xinping Wang
As one of the major pathogens, bovine viral diarrhea virus caused a significant economic loss to the livestock industry worldwide. Although BVDV infections have increasingly been reported in China in recent years, the molecular aspects of those BVDV strains were barely characterized. In this study, we reported the identification and characterization of a novel BVDV isolate designated as SD-15 from cattle, which is associated with an outbreak characterized by severe hemorrhagic and mucous diarrhea with high morbidity and mortality in Shandong, China...
2016: PloS One
Stefan W Metz, Shaomin Tian, Gabriel Hoekstra, Xianwen Yi, Michelle Stone, Katie Horvath, Michael J Miley, Joseph DeSimone, Chris J Luft, Aravinda M de Silva
Dengue virus (DENV) is the causative agent of dengue fever and dengue hemorrhagic fever. The virus is endemic in over 120 countries, causing over 350 million infections per year. Dengue vaccine development is challenging because of the need to induce simultaneous protection against four antigenically distinct DENV serotypes and evidence that, under some conditions, vaccination can enhance disease due to specific immunity to the virus. While several live-attenuated tetravalent dengue virus vaccines display partial efficacy, it has been challenging to induce balanced protective immunity to all 4 serotypes...
October 2016: PLoS Neglected Tropical Diseases
Amanda McGuire, Kaitlyn Miedema, Joseph R Fauver, Amber Rico, Tawfik Aboellail, Sandra L Quackenbush, Ann Hawkinson, Tony Schountz
Rodent-borne hantaviruses can cause two human diseases with many pathological similarities: hantavirus cardiopulmonary syndrome (HCPS) in the western hemisphere and hemorrhagic fever with renal syndrome in the eastern hemisphere. Each virus is hosted by specific reservoir species without conspicuous disease. HCPS-causing hantaviruses require animal biosafety level-4 (ABSL-4) containment, which substantially limits experimental research of interactions between the viruses and their reservoir hosts. Maporal virus (MAPV) is a South American hantavirus not known to cause disease in humans, thus it can be manipulated under ABSL-3 conditions...
October 18, 2016: Viruses
Arun Agarwal, Samiksha Sharma, Mala Airun
In Dengue Hemorrhagic Fever (DHF), hemorrhagic manifestations are common but thrombotic events are uncommonly reported, despite the wide range of increased procoagulant activity during Dengue Fever illness. We report a case of a 55-year-old man of Asian Indian ethnicity who developed large vein thrombotic event -Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE) in the acute phase of DHF. His condition was further complicated by associated thrombocytopenia. The etiological connections between dengue viral infection with thrombocytopenia, DVT/PE and abnormal thrombophilia profile as well as the treatment dilemmas posed in treating a patient of DF with hemorrhagic manifestations and associated DVT/PE, and the role of eltrombopag are discussed...
August 2016: Journal of the Association of Physicians of India
Shu-Jun Ding, Yi Zhang, Xiao-Mei Zhang, Xiao-Lin Jiang, Bo Pang, Yong-Hong Song, Jian-Xing Wang, Yao-Wen Pei, Chuan-Fu Zhu, Xian-Jun Wang, Xue-Jie Yu
OBJECTIVE: Severe fever with thrombocytopenia syndrome (SFTS) is an emerging hemorrhagic fever caused by a tick-borne bunyavirus (SFTSV) in East Asian countries. The role of human leukocyte antigen (HLA) in resistance and susceptibility to SFTSV is not known. We investigated the correlation of HLA locus A, B and DRB1 alleles with the occurrence of SFTS. METHODS: A total of 84 confirmed SFTS patients (patient group) and 501 unrelated non-SFTS patients (healthy individuals as control group) from Shandong Province were genotyped by PCR-sequence specific oligonucleotide probe (PCR-SSOP) for HLA-A, B and DRB1 loci...
October 2016: PLoS Neglected Tropical Diseases
D B Kadam, Sonali Salvi, Ajay Chandanwale
The World Health Organization (WHO) has coined the term expanded dengue to describe cases which do not fall into either dengue shock syndrome or dengue hemorrhagic fever. This has incorporated several atypical findings of dengue. Dengue virus has not been enlisted as a common etiological agent in several conditions like encephalitis, Guillain Barre syndrome. Moreover it is a great mimic of co-existing epidemics like Malaria, Chikungunya and Zika virus disease, which are also mosquito-borne diseases. The atypical manifestations noted in dengue can be mutisystemic and multifacetal...
July 2016: Journal of the Association of Physicians of India
D L Rock
African swine fever (ASF), an acute, viral hemorrhagic disease in domestic swine with mortality rates approaching 100%, is arguably the most significant emerging disease threat for the swine industry worldwide. Devastating ASF outbreaks and continuing epidemic in the Caucasus region and Russia (2007-to date) highlight significance of this disease threat. There is no vaccine for ASF, thus leaving animal slaughter the only effective disease control option. It is clear, however, that vaccination is possible since protection against reinfection with the homologous strain of African swine fever virus (ASFV) has been clearly demonstrated...
October 11, 2016: Veterinary Microbiology
Robert N Kirchdoerfer, Crystal L Moyer, Dafna M Abelson, Erica Ollmann Saphire
Filoviruses are capable of causing deadly hemorrhagic fevers. All nonsegmented negative-sense RNA-virus nucleocapsids are composed of a nucleoprotein (NP), a phosphoprotein (VP35) and a polymerase (L). However, the VP30 RNA-synthesis co-factor is unique to the filoviruses. The assembly, structure, and function of the filovirus RNA replication complex remain unclear. Here, we have characterized the interactions of Ebola, Sudan and Marburg virus VP30 with NP using in vitro biochemistry, structural biology and cell-based mini-replicon assays...
October 2016: PLoS Pathogens
Ruixue Miao, Zhiling Wang, Qin Guo, Yang Wen, Qiong Liao, Yu Zhu, Min Shu, Chaomin Wan
BACKGROUND: Visceral Leishmaniasis (VL) is a life-threatening parasitic infection transmitted by phlebotomine sandflies. We undertook this study to analyze the clinical features of pediatric VL in a population of Chinese children. METHODS: A retrospective study was performed with pediatric patients (≤14years) diagnosed with VL based on bone-marrow biopsy, serology and diagnosis based on clinical manifestation and the improvement after the experimental drug when negative bone marrow and serology results were shown...
September 30, 2016: Pediatric Infectious Disease Journal
Annie Elong Ngono, Hui-Wen Chen, William W Tang, Yunichel Joo, Kevin King, Daniela Weiskopf, John Sidney, Alessandro Sette, Sujan Shresta
Infection with one of the four dengue virus serotypes (DENV1-4) presumably leads to lifelong immunity against the infecting serotype but not against heterotypic reinfection, resulting in a greater risk of developing Dengue Hemorrhagic Fever/Dengue Shock Syndrome (DHF/DSS) during secondary infection. Both antibodies and T cell responses have been implicated in DHF/DSS pathogenesis. According to the T cell-based hypothesis termed "original antigenic sin," secondary DENV infection is dominated by non-protective, cross-reactive T cells that elicit an aberrant immune response...
October 7, 2016: EBioMedicine
Mustafa Özçetin, Mehmet Karacı, Ertuğ Toroslu, Nurullah Edebali
Pituitary adenomas usually arise from the anterior lobe of the pituitary gland and are manifested with hormonal disorders or mass effect. Mass effect usually occurs in nonfunctional tumors. Pituitary adenomas may be manifested with visual field defects or rarely in the form of total oculomotor palsy. Visual field defect is most frequently in the form of bitemporal hemianopsia and superior temporal defect. Sudden loss of vision, papilledema and ophthalmoplegia may be observed. Pituitary apoplexy is defined as an acute clinical syndrome characterized with headache, vomiting, loss of vision, ophthalmoplegia and clouding of consciousness...
September 2016: Türk Pediatri Arşivi
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 a RNA polymerase inhibitor that showed a 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 non-human primates (NHP) 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 BID...
October 10, 2016: Antimicrobial Agents and Chemotherapy
P V Shiji, Veena Viswanath, Sreena Sreekumar, R Sreejith, Abdul Majeed, V Udayabhaskaran
Kyasanur Forest disease is a tick-borne arboviral fever with biphasic course of illness with prominent hemorrhagic features in the first phase and encephalitic picture in the second phase. So far it has been described in the southern Karnataka only. Here we report a case of Kyasanur Forest Disease for the first time from Kerala in an 18 year old male from Noolpuzha - Alathoor colony of Wayanad district.
March 2016: Journal of the Association of Physicians of India
Avas Chandra Ray, Subhra Aditya, Pulak Kumar Jana, Apratim Chatterjee, Anup Sarkar, Jay Mehta, Jotideb Mukhopadhyay
A young male labourer developed pain at the site of blunt trauma over back of chest followed by fever, cough with expectoration, breathlessness and hemorrhagic pleural effusion in the side of injury. What could have been passed as a sequel of trauma turned out to be the consequences of an underlying rare and aggressive malignant tumor of the chest wall known as Askin tumor or Primitive Neuroectodermal Tumor (PNET). CT thorax with guided FNAC, debulking operation, histopathological examination followed by immunohistochemistry of the tumor tissue led to the final diagnosis...
March 2016: Journal of the Association of Physicians of India
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