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https://www.readbyqxmd.com/read/29443656/highlights-for-dengue-immunopathogenesis-antibody-dependent-enhancement-cytokine-storm-and-beyond
#1
Diogo Kuczera, João Paulo Assolini, Fernanda Tomiotto-Pellissier, Wander Rogério Pavanelli, Guilherme Ferreira Silveira
Infection with dengue virus (DENV) can lead to a wide spectrum of clinical presentations, ranging from asymptomatic infection to death. It is estimated that the disease manifests only in 90 million cases out of the total 390 million yearly infections. Even though research has not yet elucidated which are the precise pathophysiological mechanisms that trigger severe forms of dengue, the infection elicits a critical immune response significant for dengue pathogenesis development. Understanding how the immune response to DENV is established and how it can resolve the infection or turn into an immunopathology is of great importance in DENV research...
February 2018: Journal of Interferon & Cytokine Research
https://www.readbyqxmd.com/read/29439121/brain-imaging-in-cases-with-positive-serology-for-dengue-with-neurologic-symptoms-a-clinicoradiologic-correlation
#2
H A Vanjare, P Mannam, A K Mishra, R Karuppusami, R A B Carey, A M Abraham, W Rose, R Iyyadurai, S Mani
BACKGROUND AND PURPOSE: Dengue is a common arboviral disease, which uncommonly involves the brain. There has been a recent surge in dengue cases and dengue-related deaths in tropical countries. The aim of this study was to describe brain imaging findings in patients with dengue infection having neurologic symptoms. MATERIALS AND METHODS: Thirty-five patients with positive serology for dengue with CNS symptoms undergoing imaging of the brain were included in the study...
February 8, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29379207/structural-basis-for-neutralization-of-japanese-encephalitis-virus-by-two-potent-therapeutic-antibodies
#3
Xiaodi Qiu, Yingfeng Lei, Pan Yang, Qiang Gao, Nan Wang, Lei Cao, Shuai Yuan, Xiaofang Huang, Yongqiang Deng, Wenyu Ma, Tianbing Ding, Fanglin Zhang, Xingan Wu, Junjie Hu, Shan-Lu Liu, Chengfeng Qin, Xiangxi Wang, Zhikai Xu, Zihe Rao
Japanese encephalitis virus (JEV), closely related to dengue, Zika, yellow fever and West Nile viruses, remains neglected and not well characterized 1 . JEV is the leading causative agent of encephalitis, and is responsible for thousands of deaths each year in Asia. Humoral immunity is essential for protecting against flavivirus infections and passive immunization has been demonstrated to be effective in curing disease2,3. Here, we demonstrate that JEV-specific monoclonal antibodies, 2F2 and 2H4, block attachment of the virus to its receptor and also prevent fusion of the virus...
January 29, 2018: Nature Microbiology
https://www.readbyqxmd.com/read/29357366/mait-cells-are-activated-in-acute-dengue-virus-infection-and-after-in-vitro-zika-virus-infection
#4
Dominic Paquin-Proulx, Vivian Lida Avelino-Silva, Bianca A N Santos, Nathália Silveira Barsotti, Fabiana Siroma, Jessica Fernandes Ramos, Adriana Coracini Tonacio, Alice Song, Alvino Maestri, Natalia Barros Cerqueira, Alvina Clara Felix, José Eduardo Levi, Benjamin C Greenspun, Miguel de Mulder Rougvie, Michael G Rosenberg, Douglas F Nixon, Esper G Kallas
Dengue virus (DENV) and Zika virus (ZIKV) are members of the Flaviviridae and are predominantly transmitted via mosquito bites. Both viruses are responsible for a growing number of infections in tropical and subtropical regions. DENV infection can cause lethargy with severe morbidity and dengue shock syndrome leading to death in some cases. ZIKV is now linked with Guillain-Barré syndrome and fetal malformations including microcephaly and developmental disorders (congenital Zika syndrome). The protective and pathogenic roles played by the immune response in these infections is unknown...
January 22, 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29344875/development-of-a-prognostic-prediction-model-to-determine-severe-dengue-in-children
#5
Priya Sreenivasan, Geetha S, Sasikala K
OBJECTIVE: To develop a prognostic prediction model using the seven warning signs highlighted by WHO revised Dengue fever classification 2009 to determine severe dengue in children. METHODS: In this prospective analytical study conducted in a tertiary care centre, consecutive sampling of all children aged 1mo to 12y admitted with serologically confirmed Dengue was done from May 2015 through August 2016. After excluding 27 patients with co-infections and co-morbidities, 359 patients were followed up daily to assess clinical and laboratory progression till discharge/ death...
January 18, 2018: Indian Journal of Pediatrics
https://www.readbyqxmd.com/read/29343583/structural-study-of-the-c-terminal-domain-of-non-structural-protein-1-from-japanese-encephalitis-virus
#6
Thanalai Poonsiri, Gareth S A Wright, Michael S Diamond, Lance Turtle, Tom Solomon, Svetlana V Antonyuk
Japanese encephalitis virus (JEV) is a mosquito-transmitted Flavivirus that is closely related to other emerging viral pathogens including dengue, West Nile (WNV) and Zika viruses. JEV infection can result in meningitis and encephalitis, which in severe cases cause permanent brain damage and death. JEV occurs predominantly in rural areas throughout Southeast Asia, the Pacific islands and the Far East, causing around 68,000 cases worldwide each year. In this study, we present a 2.1 Å resolution crystal structure of the C-terminal β-ladder domain of JEV non-structural protein 1 (NS1-C)...
January 17, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29321321/functional-analysis-of-the-dengue-virus-genome-using-an-insertional-mutagenesis-screen
#7
Jeffrey W Perry, Yanhua Chen, Elizabeth Speliotes, Andrew W Tai
In the last few decades, dengue virus, an arbovirus, has spread to over 120 countries. Although a vaccine has been approved in some countries, limitations on its effectiveness, and a lack of effective antiviral treatments reinforce the need for additional research. The functions of several viral nonstructural proteins are essentially unknown. To better understand the functions of these proteins and thus dengue virus pathogenesis, we embarked on a genome wide transposon mutagenesis screen with Next Generation Sequencing to determine sites in the viral genome that tolerate 15 nucleotide insertions...
January 10, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29313575/a-study-of-clinical-profile-of-patients-presenting-with-complications-of-acute-febrile-illnesses-during-monsoon
#8
Kaustubh Dilip Salagre, Ravindra Nath Sahay, Amar R Pazare, Abhishek Dubey, Kunal K Marathe
Background: The objective of this study was to describe clinico-laboratory profile and outcome of complicated acute febrile illnesses among inpatients in a tertiary care hospital during monsoon. Methods: This was an observational, prospective study conducted in a tertiary care hospital in Mumbai, India. Between July 2016 to October 2016, adult patients admitted to the hospital with complicated acute febrile illness were included. Demographic, clinical and laboratory data were collected and analyzed for each patient...
September 2017: Journal of the Association of Physicians of India
https://www.readbyqxmd.com/read/29250519/evaluating-the-surveillance-system-for-spotted-fever-in-brazil-using-machine-learning-techniques
#9
Diego Montenegro Lopez, Flávio Luis de Mello, Cristina Maria Giordano Dias, Paula Almeida, Milton Araújo, Monica Avelar Magalhães, Gilberto Salles Gazeta, Reginaldo Peçanha Brasil
This work analyses the performance of the Brazilian spotted fever (SF) surveillance system in diagnosing and confirming suspected cases in the state of Rio de Janeiro (RJ), from 2007 to 2016 (July) using machine-learning techniques. Of the 890 cases reported to the Disease Notification Information System (SINAN), 11.7% were confirmed as SF, 2.9% as dengue, 1.6% as leptospirosis, and 0.7% as tick bite allergy, with the remainder being diagnosed as other categories (10.5%) or unspecified (72.7%). This study confirms the existence of obstacles in the diagnostic classification of suspected cases of SF by clinical signs and symptoms...
2017: Frontiers in Public Health
https://www.readbyqxmd.com/read/29225757/dengue-fever-in-a-south-asian-metropolis-a-report-on-219-cases
#10
Shiv Sekhar Chatterjee, Ankush Sharma, Shilpee Choudhury, Sushil Kumar Chumber, Ras Bage, Nittin Parkhe, Uma Khanduri
Background and Objectives: Yearly epidemics of Dengue fever occur post-monsoon in India's capital, Delhi. A prospective observational study was conducted during the outbreak months to understand the epidemiology and outcome of this infection and its economic impact. Materials and Methods: Febrile hospitalized (n=219) patients with dengue fever diagnosed by a combination of MAC-ELISA, GAC-ELISA and NS1Antigen-ELISA were enrolled. Epidemiologic (including economic) parameters, clinical, radiological and laboratory manifestations were noted and patients followed up over the period of hospital stay...
June 2017: Iranian Journal of Microbiology
https://www.readbyqxmd.com/read/29219127/dengue-fever-in-a-municipality-of-west-bengal-india-2015-an-outbreak-investigation
#11
Falguni Debnath, Manickam Ponnaiah, Pralay Acharya
BACKGROUND: In November 2015, death due to fever and increased number of fever cases were reported from Baranagar Municipality of North 24 Parganas district of West Bengal. OBJECTIVES: The episode was investigated with the objective to (1) confirm the existence of an outbreak, (2) describe it in terms of time, place, and person, (3) determine the cause of outbreak, and (4) recommend control measures. METHODS: Monthly incidence of dengue from 2012 to 2014 was calculated and compared with 2015 to confirm the outbreak...
October 2017: Indian Journal of Public Health
https://www.readbyqxmd.com/read/29207707/diagnostic-approach-to-viral-acute-encephalitis-syndrome-aes-in-paediatric-age-group-a-study-from-new-delhi
#12
Shipra Goel, Anita Chakravarti, Mukta Mantan, Surinder Kumar, Md Anzar Ashraf
Introduction: Acute Encephalitis Syndrome has heralded the emergence of multiple virulent pathogens, which may result in severe morbidity and mortality. In India, encephalitis is not notified and there has been a dearth of analysis for trends in encephalitis death rates and causation. A downward trend has been observed in encephalitis deaths, due to 'known' causes, which can be largely explained by improvement in diagnostic, treatment, and prevention methods. There is still a very high proportion of encephalitis deaths in developing countries, where the aetiological diagnosis of the pathogen is not established and thus, lies the importance of monitoring encephalitis morbidity and mortality with a view to improve pathogen diagnosis and identify emerging infectious diseases...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29200153/dengue-associated-hemophagocytic-lymphohistiocytosis-a-rare-complication-of-a-common-infection-in-singapore
#13
Kai-Qian Kam, Shui Yen Soh, Rajat Bhattacharyya
Hemophagocytic lymphohistiocytosis (HLH) can progress rapidly, often leading to multisystem organ failure and death. Prompt recognition of the syndrome and institution of appropriate treatment are crucial steps in improving the outcome. Dengue virus infection is not commonly known to be associated with secondary HLH. We present a case of a child with dengue fever who subsequently developed classical features of HLH. He was treated successfully with 4 weeks of steroid monotherapy instead of the multidrug therapy proposed in the HLH 2004 protocol...
December 1, 2017: Journal of Pediatric Hematology/oncology
https://www.readbyqxmd.com/read/29193604/first-insights-on-insecticidal-activity-upon-aedes-aegypti-and-partial-biochemical-characterization-of-a-novel-low-molecular-mass-chymotrypsin-trypsin-inhibitor-purified-from-lonchocarpus-sericeus-seeds
#14
Luiz C P Almeida Filho, Pedro M S Tabosa, Denise C Hissa, Ilka M Vasconcelos, Ana F U Carvalho
BACKGROUND: Arboviroses such as dengue, zika and chikungunya represent a serious issue in public health due to the absence of approved vaccine or specific antiviral drugs. One way to prevent these diseases is by combating the vector mosquito, Aedes aegypti (Diptera), which has serine proteases in the midgut. Protease inhibitors are molecules that can block enzyme activity impairing digestion and nutrition that can lead to death. Thus, we purified and characterized a novel chymotrypsin- trypsin inhibitor from Lonchocarpus sericeus (LsCTI) seeds and investigated its effect upon Ae...
November 28, 2017: Pest Management Science
https://www.readbyqxmd.com/read/29192272/ribosomal-stress-and-tp53-mediated-neuronal-apoptosis-in-response-to-capsid-protein-of-the-zika-virus
#15
Lukasz P Slomnicki, Dong-Hoon Chung, Austin Parker, Taylor Hermann, Nolan L Boyd, Michal Hetman
We report here that in rat and human neuroprogenitor cells as well as rat embryonic cortical neurons Zika virus (ZIKV) infection leads to ribosomal stress that is characterized by structural disruption of the nucleolus. The anti-nucleolar effects were most pronounced in postmitotic neurons. Moreover, in the latter system, nucleolar presence of ZIKV capsid protein (ZIKV-C) was associated with ribosomal stress and apoptosis. Deletion of 22 C-terminal residues of ZIKV-C prevented nucleolar localization, ribosomal stress and apoptosis...
November 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29191515/mapping-the-spatial-distribution-of-aedes-aegypti-and-aedes-albopictus
#16
Fangyu Ding, Jingying Fu, Dong Jiang, Mengmeng Hao, Gang Lin
Mosquito-borne infectious diseases, such as Rift Valley fever, Dengue, Chikungunya and Zika, have caused mass human death with the transnational expansion fueled by economic globalization. Simulating the distribution of the disease vectors is of great importance in formulating public health planning and disease control strategies. In the present study, we simulated the global distribution of Aedes aegypti and Aedes albopictus at a 5×5km spatial resolution with high-dimensional multidisciplinary datasets and machine learning methods Three relatively popular and robust machine learning models, including support vector machine (SVM), gradient boosting machine (GBM) and random forest (RF), were used...
November 27, 2017: Acta Tropica
https://www.readbyqxmd.com/read/29181956/infectious-diseases-in-poland-in-2015
#17
Małgorzata Sadkowska-Todys, Andrzej Zieliński, Mirosław P. Czarkowski
PURPOSE OF THE STUDY: This is the next annual analysis of the situation of infectious and parasitic diseases in Poland in 2015 within the framework of the Epidemiological Chronicle of Przegląd Epidemiologiczny - Epidemiological Review. Its purpose is to identify potential threats to the health of populations from infectious diseases occurring in Poland with reference to other parts of the globe. MATERIAL AND METHODS: This paper is an introduction to more detailed studies of the epidemiological situation of selected infectious diseases and summarizes the results of the surveillance of infectious diseases in Poland in 2015...
2017: Przegla̧d Epidemiologiczny
https://www.readbyqxmd.com/read/29176643/development-of-a-quantitative-ns1-capture-enzyme-linked-immunosorbent-assay-for-early-detection-of-yellow-fever-virus-infection
#18
Taissa Ricciardi-Jorge, Juliano Bordignon, Andrea Koishi, Camila Zanluca, Ana Luiza Mosimann, Claudia Nunes Duarte Dos Santos
Yellow fever is an arboviral disease that causes thousands of deaths every year in Africa and the Americas. However, few commercial diagnostic kits are available. Non-structural protein 1 (NS1) is an early marker of several flavivirus infections and is widely used to diagnose dengue virus (DENV) infection. Nonetheless, little is known about the dynamics of Yellow fever virus (YFV) NS1 expression and secretion, to encourage its use in diagnosis. To tackle this issue, we developed a quantitative NS1-capture ELISA specific for YFV using a monoclonal antibody and recombinant NS1 protein...
November 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29167501/dengue-fatal-cases-present-virus-specific-hmgb1-response-in-peripheral-organs
#19
Edson R A Oliveira, Tiago F Póvoa, Gerard J Nuovo, Diego Allonso, Natália G Salomão, Carlos A Basílio-de-Oliveira, Luiz H M Geraldo, Celina G Fonseca, Flávia R S Lima, Ronaldo Mohana-Borges, Marciano V Paes
Dengue is an important infectious disease that presents high incidence and yields a relevant number of fatal cases (about 20,000) every year worldwide. Despite its epidemiological relevance, there are many knowledge gaps concerning dengue pathogenesis, especially with regards to the circumstances that drive a mild clinical course to a severe disease. In this work, we investigated the participation of high mobility group box 1 (HMGB1), an important modulator of inflammation, in dengue fatal cases. Histopathological and ultrastructural analyses revealed that liver, lung and heart post-mortem samples were marked by tissue abnormalities, such as necrosis and apoptotic cell death...
November 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29156382/discovery-of-selective-dengue-virus-inhibitors-using-combination-of-molecular-fingerprint-based-virtual-screening-protocols-structure-based-pharmacophore-model-development-molecular-dynamics-simulations-and-in-vitro-studies
#20
Shaher Bano Mirza, Regina Ching Hua Lee, Justin Jang Hann Chu, Ramin Ekhteiari Salmas, Thomas Mavromoustakos, Serdar Durdagi
Dengue virus is a major issue of tropical and sub-tropical regions. The proliferation of virus results in immense number of deaths each year because of unavailability of on-shelf drugs. This issue necessitates the design of novel anti-Dengue drugs. The protease enzyme pathway is the critical target for drug design due to its significance in the replication, survival and other cellular activities of Dengue virus. Keeping in mind the worsening situation regarding Dengue virus, approximately eighteen million drug-like compounds from the ZINC small molecule database have been screened against Nonstructural Protein 3 (NS3) previously by our group...
October 24, 2017: Journal of Molecular Graphics & Modelling
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