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Hemorrhagic Fever viruses

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https://www.readbyqxmd.com/read/28229289/clinical-aspects-of-hantavirus-infections-in-bulgaria
#1
I Christova, M Pishmisheva, I Trifonova, N Vatev, M Stoycheva, M Tiholova, D Igova, M Baev, R Karagyaurova, U Prokopova
BACKGROUND: Hantaviruses cause two distinct human diseases: hemorrhagic fever with renal syndrome (HFRS) in Asia and Europe and hantavirus pulmonary syndrome (HPS) in America. In Europe, mainly Puumala, Dobrava and Seoul viruses cause HFRS. A total of 23 cases of HFRS were detected in Bulgaria over a 2‑year period 2013-2014. The aim of the study was to present epidemiology, clinical manifestations and laboratory findings of these patients. METHODS: Patients with HFRS were diagnosed using PCR, ELISA and immunoblotting tests...
February 22, 2017: Wiener Klinische Wochenschrift
https://www.readbyqxmd.com/read/28225498/dengue-associated-hemophagocyticlymphohistiocytosis-in-an-adult-a-case-report-and-literature-review
#2
Sang Mi Chung, Joon Young Song, Wonshik Kim, Min Joo Choi, Ji Ho Jeon, Seonghui Kang, Eunju Jung, Ji Yun Noh, Hee Jin Cheong, Woo Joo Kim
BACKGROUND: Infection-associated hemophagocytic syndrome (IAHS) is potentially a fatal disease caused by systemic infection complicated by hemophagocyticlymphohistiocytosis (HLH). Here, we report a case of HLH associated with dengue hemorrhagic fever (DHF) after a trip to Thailand. CASE SUMMARY: A 33-year-old healthy female patient presented with 3 days of fever, myalgia, and skin rash. Serotype 3 dengue virus was isolated. Clinical and laboratory findings fulfilled the criteria of HLH...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28222130/dengue-virus-antibody-database-systematically-linking-serotype-specificity-with-epitope-mapping-in-dengue-virus
#3
Sidhartha Chaudhury, Gregory D Gromowski, Daniel R Ripoll, Ilja V Khavrutskii, Valmik Desai, Anders Wallqvist
BACKGROUND: A majority infections caused by dengue virus (DENV) are asymptomatic, but a higher incidence of severe illness, such as dengue hemorrhagic fever, is associated with secondary infections, suggesting that pre-existing immunity plays a central role in dengue pathogenesis. Primary infections are typically associated with a largely serotype-specific antibody response, while secondary infections show a shift to a broadly cross-reactive antibody response. METHODS/PRINCIPAL FINDINGS: We hypothesized that the basis for the shift in serotype-specificity between primary and secondary infections can be found in a change in the antibody fine-specificity...
February 21, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28220142/absence-of-an-n-linked-glycosylation-motif-in-the-glycoprotein-of-the-live-attenuated-argentine-hemorrhagic-fever-vaccine-candid-1-results-in-its-improper-processing-and-reduced-surface-expression
#4
John T Manning, Alexey V Seregin, Nadezhda E Yun, Takaaki Koma, Cheng Huang, José Barral, Juan C de la Torre, Slobodan Paessler
Junin virus (JUNV), a highly pathogenic New World arenavirus, is the causative agent of Argentine hemorrhagic fever (AHF). The live-attenuated Candid #1 (Can) strain currently serves as a vaccine for at-risk populations. We have previously shown that the Can glycoprotein (GPC) gene is the primary gene responsible for attenuation in a guinea pig model of AHF. However, the mechanisms through which the GPC contributes to the attenuation of the Can strain remain unknown. A more complete understanding of the mechanisms underlying the attenuation and immunogenicity of the Can strain will potentially allow for the rational design of additional safe and novel vaccines...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28217383/management-dilemmas-in-a-rare-case-of-pituitary-apoplexy-in-the-setting-of-dengue-hemorrhagic-fever
#5
S J Balaparameswara Rao, Amey R Savardekar, B N Nandeesh, A Arivazhagan
BACKGROUND: Pituitary apoplexy occurs due to infarction or hemorrhage, within a pituitary adenoma or a nontumorous pituitary gland and can have catastrophic consequences. Dengue hemorrhagic fever (DHF) is a severe manifestation of the spectrum of dengue virus infection and is characterized by high-grade fever, thrombocytopenia, hemorrhagic tendencies, and increased vascular permeability. Cases of incidentalomas complicated by DHF and presenting with apoplexy are extremely rare. CASE DESCRIPTION: We describe the case of a 45-year-old gentleman who suffered an attack of pituitary apoplexy while being treated for DHF...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28216187/recombinant-proteins-of-zaire-ebolavirus-induce-potent-humoral-and-cellular-immune-responses-and-protect-against-live-virus-infection-in-mice
#6
Axel T Lehrer, Teri-Ann S Wong, Michael M Lieberman, Tom Humphreys, David E Clements, Russell R Bakken, Mary Kate Hart, William D Pratt, John M Dye
Infections with filoviruses in humans are highly virulent, causing hemorrhagic fevers which result in up to 90% mortality. In addition to natural infections, the ability to use these viruses as bioterrorist weapons is of significant concern. Currently, there are no licensed vaccines or therapeutics available to combat these infections. The pathogenesis of disease involves the dysregulation of the host's immune system, which results in impairment of the innate and adaptive immune responses, with subsequent development of lymphopenia, thrombocytopenia, hemorrhage, and death...
February 16, 2017: Vaccine
https://www.readbyqxmd.com/read/28213810/how-to-tackle-natural-focal-infections-from-risk-assessment-to-vaccination-strategies
#7
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/28198548/phylogenetic-characterization-of-circulating-dengue-and-alkhumra-hemorrhagic-fever-viruses-in-western-saudi-arabia-and-lack-of-evidence-of-zika-virus-in-the-region-a-retrospective-study-2010-2015
#8
Moneerah S Al-Saeed, Sherif A El-Kafrawy, Suha A Farraj, Tagreed L Al-Subhi, Norah A Othman, Arwa Alsultan, Huda G Ben Helaby, Mustafa M Alshawdari, Ahmed M Hassan, Remi N Charrel, Esam I Azhar, Anwar M Hashem
Flaviviruses represent a global public health concern. They consist of ∼70 viruses with almost half of them causing human diseases with unspecified febrile illnesses. Cities in western Saudi Arabia are endemic for viruses (DENV) with sporadic infections due to Alkhumra hemorrhagic fever virus (AHFV). They also represent a major destination for travelers coming for annual religious pilgrimages (Hajj and Umrah) from all over the world. However, whether other flaviviruses are circulating is not known because of the limited number of surveillance studies...
February 15, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28194457/disposable-cartridge-platform-for-rapid-detection-of-viral-hemorrhagic-fever-viruses
#9
Steven M Scherr, David S Freedman, Krystle N Agans, Alexandru Rosca, Erik Carter, Melody Kuroda, Helen E Fawcett, Chad E Mire, Thomas W Geisbert, M Selim Ünlü, John H Connor
Light microscopy is a straightforward and highly portable imaging approach that is used for the detection of parasites, fungi, and bacteria. The detection of individual virus particles has historically not been possible through this approach. Thus, characterization of virus particles is typically performed using high-energy approaches such as electron microscopy. These approaches require purification of virions away from its normal milieu, significant levels of expertise, and only count a small number of particles at a time...
February 14, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28192064/aedes-borne-virus-mosquito-interactions-mass-spectrometry-strategies-and-findings
#10
Victoria Pando-Robles, Cesar V Batista
Aedes-borne viruses are responsible for high-impact neglected tropical diseases and unpredictable outbreaks such as the ongoing Zika epidemics. Aedes mosquitoes spread different arboviruses such as Dengue virus (DENV), Chikungunya virus (CHIKV), and Zika virus, among others, and are responsible for the continuous emergence and reemergence of these pathogens. These viruses have complex transmission cycles that include two hosts, namely the Aedes mosquito as a vector and susceptible vertebrate hosts. Human infection with arboviruses causes diseases that range from subclinical or mild to febrile diseases, encephalitis, and hemorrhagic fever...
February 13, 2017: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/28191384/delayed-temporal-lobe-hemorrhage-after-initiation-of-acyclovir-in-an-immunocompetent-patient-with-herpes-simplex-virus-2-encephalitis-a-case-report
#11
Kyle Mueller, Joshua E Ryan, Alex Tai, Rocco A Armonda
Herpes simplex virus (HSV) is the most common cause of non-epidemic, sporadic, acute focal encephalitis in the United States. Inflammation of the vasculature makes them friable and susceptible to hemorrhage. Massive hemorrhage, though rare, can present in a delayed fashion after initiation of acyclovir and often requires surgical intervention. We report a unique case of delayed temporal lobe hemorrhage after initiation of acyclovir in an immunocompetent patient, specifically for its presentation, virology, and surgical management...
January 15, 2017: Curēus
https://www.readbyqxmd.com/read/28153057/unusual-presentation-of-a-severely-ill-patient-having-severe-fever-with-thrombocytopenia-syndrome-a-case-report
#12
Masahiko Kaneko, Masaki Maruta, Hisaharu Shikata, Kengo Asou, Hiroto Shinomiya, Tadaki Suzuki, Hideki Hasegawa, Masayuki Shimojima, Masayuki Saijo
BACKGROUND: Severe fever with thrombocytopenia syndrome is an emerging infectious disease caused by a novel phlebovirus belonging to the family Bunyaviridate. Emergence of encephalitis/encephalopathy during severe fever with thrombocytopenia syndrome progression has been identified as a major risk factor associated with a poor prognosis. Here we report the case of a severely ill patient with severe fever with thrombocytopenia syndrome virus-associated encephalitis/encephalopathy characterized by a lesion of the splenium, which resolved later...
February 3, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28152487/a-heparin-functionalized-carbon-nanotube-based-affinity-biosensor-for-dengue-virus
#13
Daniel Wasik, Ashok Mulchandani, Marylynn V Yates
Dengue virus is an arthropod-borne virus transmitted primarily by Aedes mosquitos and is major cause of disease in tropical and subtropical regions. Colloquially known as Dengue Fever, infection can cause hemorrhagic disorders and death in humans and non-human primates. We report a novel electronic biosensor based on a single-walled carbon nanotube network chemiresistive transducer that is functionalized with heparin for low-cost, label-free, ultra-sensitive, and rapid detection of whole dengue virus (DENV)...
May 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28152326/safety-and-immunogenicity-of-gamevac-combi-a-heterologous-vsv-and-ad5-vectored-ebola-vaccine-an-open-phase-i-ii-trial-in-healthy-adults-in-russia
#14
I V Dolzhikova, O V Zubkova, A I Tukhvatulin, A S Dzharullaeva, N M Tukhvatulina, D V Shcheblyakov, M M Shmarov, E A Tokarskaya, Y V Simakova, D A Egorova, D N Scherbinin, I L Tutykhina, A A Lysenko, A V Kostarnoy, P G Gancheva, T A Ozharovskaya, B V Belugin, L V Kolobukhina, V B Pantyukhov, S I Syromyatnikova, I V Shatokhina, T V Sizikova, I G Rumyantseva, A F Andrus, N V Boyarskaya, A N Voytyuk, V F Babira, S V Volchikhina, D A Kutaev, A N Bel'skih, K V Zhdanov, S M Zakharenko, S V Borisevich, D Y Logunov, B S Naroditsky, A L Gintsburg
Ebola hemorrhagic fever, also known as Ebola virus disease or EVD, is one of the most dangerous viral diseases in humans and animals. In this open-label, dose-escalation clinical trial, we assessed the safety, side effects, and immunogenicity of a novel, heterologous prime-boost vaccine against Ebola, which was administered in 2 doses to 84 healthy adults of both sexes between 18 and 55 years. The vaccine consists of live-attenuated recombinant vesicular stomatitis virus (VSV) and adenovirus serotype-5 (Ad5) expressing Ebola envelope glycoprotein...
February 2, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28141833/anthropogenically-driven-environmental-changes-shift-the-ecological-dynamics-of-hemorrhagic-fever-with-renal-syndrome
#15
Huaiyu Tian, Pengbo Yu, Ottar N Bjørnstad, Bernard Cazelles, Jing Yang, Hua Tan, Shanqian Huang, Yujun Cui, Lu Dong, Chaofeng Ma, Changan Ma, Sen Zhou, Marko Laine, Xiaoxu Wu, Yanyun Zhang, Jingjun Wang, Ruifu Yang, Nils Chr Stenseth, Bing Xu
Zoonoses are increasingly recognized as an important burden on global public health in the 21st century. High-resolution, long-term field studies are critical for assessing both the baseline and future risk scenarios in a world of rapid changes. We have used a three-decade-long field study on hantavirus, a rodent-borne zoonotic pathogen distributed worldwide, coupled with epidemiological data from an endemic area of China, and show that the shift in the ecological dynamics of Hantaan virus was closely linked to environmental fluctuations at the human-wildlife interface...
January 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28141593/clinical-and-virological-characteristics-of-hantavirus-infections-in-a-2014-croatian-outbreak
#16
Tatjana Vilibic-Cavlek, Alena Furic, Ljubo Barbic, Irena Tabain, Vladimir Stevanovic, Gordana Mlinaric-Galinovic
INTRODUCTION: Croatia is endemic for hemorrhagic fever with renal syndrome (HFRS), with both Puumala (PUUV) and Dobrava virus (DOBV) documented. Several large outbreaks were recorded in 1995, 2002, and 2012. We analyzed demographic, clinical, laboratory, and virological characteristics of HFRS cases detected in three geographically close natural foci (Ogulin, Slunj, and the Plitvice Lakes surroundings) during the 2014 outbreak. METHODOLOGY: From January to December 2014, 122 patients with suspected HFRS were tested for hantavirus IgM/IgG antibodies using an indirect immunofluorescence assay (IFA)...
January 30, 2017: Journal of Infection in Developing Countries
https://www.readbyqxmd.com/read/28137229/challenges-with-mosquito-borne-viral-diseases-outbreak-of-the-monsters
#17
Renu Gautam, Sweta Mishra, Archana Milhotra, Ritika Nagpal, Mradul Mohan, Anchal Singhal, Pratibha Kumari
The viruses responsible for mosquito-borne diseases are on an exploring mode, expanding their horizon, adapting to the situation and comfortably making their presence felt globally, from South Africa to Asia, Europe and United States. The current global scenario and recent documentations indicate towards the real monsters, outbreak of Zika, dengue and chikungunya viruses. Zika, dengue and chikungunya viruses, all three are positive sense single-stranded RNA arbovirus and so their initial symptoms are almost 80% similar and all three are spread by mosquitos which bite during the day...
January 30, 2017: Current Topics in Medicinal Chemistry
https://www.readbyqxmd.com/read/28126818/igg-antibodies-to-dengue-enhanced-for-fc%C3%AE-riiia-binding-determine-disease-severity
#18
Taia T Wang, Jaturong Sewatanon, Matthew J Memoli, Jens Wrammert, Stylianos Bournazos, Siddhartha Kumar Bhaumik, Benjamin A Pinsky, Kulkanya Chokephaibulkit, Nattawat Onlamoon, Kovit Pattanapanyasat, Jeffery K Taubenberger, Rafi Ahmed, Jeffrey V Ravetch
Dengue virus (DENV) infection in the presence of reactive, non-neutralizing immunoglobulin G (IgG) (RNNIg) is the greatest risk factor for dengue hemorrhagic fever (DHF) or dengue shock syndrome (DSS). Progression to DHF/DSS is attributed to antibody-dependent enhancement (ADE); however, because only a fraction of infections occurring in the presence of RNNIg advance to DHF/DSS, the presence of RNNIg alone cannot account for disease severity. We discovered that DHF/DSS patients respond to infection by producing IgGs with enhanced affinity for the activating Fc receptor FcγRIIIA due to afucosylated Fc glycans and IgG1 subclass...
January 27, 2017: Science
https://www.readbyqxmd.com/read/28124602/crimean-congo-hemorrhagic-fever-virus-in-pakistan
#19
Iftikhar Ali, Afaq Rahim, Muhammad Ijaz
The Crimean-Congo hemorrhagic fever is a zoonotic disease transmitted by ticks and is characterized by fever and bleeding. It was seen for the first time in the south of present day Ukraine and thus named, Crimean fever. 1 In 1956, the virus was isolated in a patient with similar symptoms residing in Congo, Kenya and the virus was named Congo virus. The viruses causing these two diseases were the same and hence was termed Crimean-Congo hemorrhagic fever virus (CCHFV). Humans are the only known host that develops disease...
January 17, 2017: Infectious Disorders Drug Targets
https://www.readbyqxmd.com/read/28122983/innate-immune-response-of-bat-and-human-cells-to-filoviruses-commonalities-and-distinctions
#20
Ivan V Kuzmin, Toni M Schwarz, Philipp A Ilinykh, Ingo Jordan, Thomas G Ksiazek, Ravi Sachidanandam, Christopher F Basler, Alexander Bukreyev
: Marburg (MARV) and Ebola (EBOV) viruses are zoonotic pathogens that cause severe hemorrhagic fever in humans. The natural reservoir of MARV is the Egyptian rousette bat (Rousettus aegyptiacus); that of EBOV is unknown but believed to be another bat species. The Egyptian rousette develops subclinical productive infection with MARV but is refractory to EBOV. Interaction of filoviruses with hosts is greatly affected by the viral interferon (IFN)-inhibiting domains (IID). Our study was aimed at characterization of innate immune responses to filoviruses and the role of filovirus IID in bat and human cells...
January 25, 2017: Journal of Virology
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