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Dengue virus

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https://www.readbyqxmd.com/read/28641298/generation-of-a-dna-launched-reporter-replicon-based-on-dengue-virus-type-2-as-a-multipurpose-platform
#1
Jose A Usme-Ciro, Jaime A Lopera, Diego A Alvarez, Luis Enjuanes, Fernando Almazán
No abstract text is available yet for this article.
June 23, 2017: Intervirology
https://www.readbyqxmd.com/read/28634494/antiviral-activity-of-fridericia-formosa-bureau-l-g-lohmann-bignoniaceae-extracts-and-constituents
#2
Geraldo Célio Brandão, Erna G Kroon, José D Souza Filho, Alaíde Braga Oliveira
A phytochemical study of Fridericia formosa (Bignoniaceae) ethanol extracts of leaves, stems, and fruits was guided by in vitro assays against vaccinia virus Western Reserve (VACV-WR), human herpes virus 1 (HSV-1), murine encephalomyocarditis virus (EMCV), and dengue virus type 2 (DENV-2) by the MTT method. All the ethanol extracts were active against DENV-2, HSV-1, and VACV-WR with best results for the fruits extract against DENV-2 (SI > 38.2). For VACV-WR and HSV-1, EC50 values > 200 μg mL(-1) were determined, while no inhibition of the cytopathic effect was observed with EMCV...
2017: Journal of Tropical Medicine
https://www.readbyqxmd.com/read/28632829/-advances-in-dengue-virus-research-in-colombia-the-role-of-cellular-micrornas-as-an-anti-dengue-virus-response
#3
Juan Camilo Castrillón-Betancur, Silvio Urcuqui-Inchima
Dengue is one of the most important mosquito-borne diseases, and its incidence has increased at an alarming rate in recent years, becoming a real public health problem. Currently, there is no vaccine or medication or proper treatment for dengue control. Considering this situation, it is necessary to prioritize the search for new alternatives and strategies for dengue prevention and control, in order to reduce not only the economic burden of endemic countries, but also to improve the quality of life of patients...
April 2017: Revista Chilena de Infectología: órgano Oficial de la Sociedad Chilena de Infectología
https://www.readbyqxmd.com/read/28631593/a-denv-2-type-specific-monoclonal-antibody-binds-to-the-denv-complex-reactive-antigenic-site-on-envelope-protein-domain-3
#4
Vanessa V Sarathy, Trevor J Pitcher, Gregory D Gromowski, John T Roehrig, Alan D T Barrett
The Dengue virus (DENV) envelope (E) protein is the major component of the viral surface and is structurally subdivided into three domains, ED1, ED2 and ED3. ED3 elicits potent neutralizing antibodies and contains two major antigenic sites: the DENV-type-specific and DENV-complex-reactive antigenic sites. Each site is composed of a limited subset of residues that are required for monoclonal antibody (mAb) binding. Here we show that DENV-2-type-specific mAb 9A3D-8 utilizes the functionally critical residues K307, V308, K310, I312, P332, L387, L389 and N390 for ED3 binding...
June 20, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28625589/acute-disseminated-encephalomyelitis-in-dengue-viral-infection
#5
REVIEW
Wan Aliaa Wan Sulaiman, Liyana Najwa Inche Mat, Hasnur Zaman Hashim, Fan Kee Hoo, Siew Mooi Ching, Ramachandran Vasudevan, Mohd Hazmi Mohamed, Hamidon Basri
Dengue is the most common arboviral disease affecting many countries worldwide. An RNA virus from the flaviviridae family, dengue has four antigenically distinct serotypes (DEN-1-DEN-4). Neurological involvement in dengue can be classified into dengue encephalopathy immune-mediated syndromes, encephalitis, neuromuscular or dengue muscle dysfunction and neuro-ophthalmic involvement. Acute disseminated encephalomyelitis (ADEM) is an immune mediated acute demyelinating disorder of the central nervous system following recent infection or vaccination...
June 15, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28623959/the-impact-of-wolbachia-infection-on-the-rate-of-vertical-transmission-of-dengue-virus-in-brazilian-aedes-aegypti
#6
Etiene Casagrande Pacidônio, Eric Pearce Caragata, Debora Magalhães Alves, João Trindade Marques, Luciano Andrade Moreira
BACKGROUND: Wolbachia pipientis is a common endosymbiotic bacterium of arthropods that strongly inhibits dengue virus (DENV) infection and transmission in the primary vector, the mosquito Aedes aegypti. For that reason, Wolbachia-infected Ae. aegypti are currently being released into the field as part of a novel strategy to reduce DENV transmission. However, there is evidence that DENV can be transmitted vertically from mother to progeny, and this may help the virus persist in nature in the absence of regular human transmission...
June 17, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28623027/ade-and-dengue-vaccination
#7
Ruth Aralí Martínez-Vega, Gabriel Carrasquila, Expedito Luna, José Ramos-Castañeda
The vaccine against Dengue virus (DENV), Dengvaxia® (CYD), produced by Sanofi-Pasteur, has been registered by several national regulatory agencies; nevertheless, the performance and security of this vaccine have been challenged in a series of recent papers. In this work, we intend to contribute to the debate by analyzing the concept of an enhancing vaccine, presenting objections to the epidemiological model base of the concept and, likewise, presenting data that contradict that concept.
June 13, 2017: Vaccine
https://www.readbyqxmd.com/read/28622093/suppressive-effect-of-dengue-virus-envelope-protein-domain-iii-on-megakaryopoiesis
#8
Guan-Ling Lin, Hsin-Hou Chang, Te-Sheng Lien, Po-Kong Chen, Hao Chan, Mei-Tzu Su, Chi-Yuan Liao, Der-Shan Sun
Dengue virus (DENV) infection can cause severe, life-threatening events, and no specific treatments for DENV infection are currently approved. Although thrombocytopenia is frequently observed in dengue patients, its pathogenesis is still not fully understood. Previous studies have suggested that DENV-induced thrombocytopenia occurs through viral-replication-mediated megakaryopoiesis inhibition in the bone marrow; however, the exact mechanism for megakaryopoiesis suppression remains elusive. In this study, a reductionist approach was applied, in which C57B/6J mice were inoculated with recombinant DENV-envelope protein domain III (DENV-EIII) instead of the full viral particle...
June 16, 2017: Virulence
https://www.readbyqxmd.com/read/28620811/serological-molecular-and-clinical-correlates-of-dengue-from-a-tertiary-care-centre-in-chennai-india
#9
Vigna Seshan, Gopalsamy Sarangan, Khaleefathullah Sheriff, Kaveri Krishnasamy, Gunasekaran Palani, Padma Srikanth
Dengue disease is caused by dengue viruses 1-4 and has been ranked by the World Health Organisation (WHO) as the fastest spreading vector-borne viral disease. Dengue is often underreported and misdiagnosed due to a wide spectrum of clinical manifestations. Diagnosis of dengue is based on clinical case definitions and laboratory methods. Newer case definitions of dengue have been formulated by clinical studies in order to improve case detection. Owing to its epidemic potential, mortality and morbidity, there is a need for a rapid and accurate diagnostic assay for dengue in order to help the clinician in the early detection of cases and to prevent disease progression...
June 16, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28620207/dengue-virus-activates-cgas-through-the-release-of-mitochondrial-dna
#10
Bo Sun, Karin B Sundström, Jun Jie Chew, Pradeep Bist, Esther S Gan, Hwee Cheng Tan, Kenneth C Goh, Tanu Chawla, Choon Kit Tang, Eng Eong Ooi
Cyclic GMP-AMP synthetase (cGAS) is a DNA-specific cytosolic sensor, which detects and initiates host defense responses against microbial DNA. It is thus curious that a recent study identified cGAS as playing important roles in inhibiting positive-sense single-stranded RNA (+ssRNA) viral infection, especially since RNA is not known to activate cGAS. Using a dengue virus serotype 2 (DENV-2) vaccine strain (PDK53), we show that infection creates an endogenous source of cytosolic DNA in infected cells through the release of mitochondrial DNA (mtDNA) to drive the production of cGAMP by cGAS...
June 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28617853/co-occurrence-of-viruses-and-mosquitoes-at-the-vectors-optimal-climate-range-an-underestimated-risk-to-temperate-regions
#11
Marcus S C Blagrove, Cyril Caminade, Elisabeth Waldmann, Elizabeth R Sutton, Maya Wardeh, Matthew Baylis
Mosquito-borne viruses have been estimated to cause over 100 million cases of human disease annually. Many methodologies have been developed to help identify areas most at risk from transmission of these viruses. However, generally, these methodologies focus predominantly on the effects of climate on either the vectors or the pathogens they spread, and do not consider the dynamic interaction between the optimal conditions for both vector and virus. Here, we use a new approach that considers the complex interplay between the optimal temperature for virus transmission, and the optimal climate for the mosquito vectors...
June 15, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28616499/emergence-of-wesselsbron-virus-among-black-rat-and-humans-in-eastern-senegal-in-2013
#12
Moussa M Diagne, Martin Faye, Oumar Faye, Abdourahmane Sow, Fanny Balique, Mbacké Sembène, Laurent Granjon, Pascal Handschumacher, Ousmane Faye, Mawlouth Diallo, Amadou A Sall
Wesselsbron disease is a neglected mosquito transmitted Flavivirus infection that causes abortions and has teratogenic effects on sheep and cattle in Africa. Human can also be infected. The detection of human or animal cases is complicated by the non-specific symptoms close to Rift Valley Fever (RVF) in domestic livestock species or Dengue like syndrome in humans. Then, these detections are usually made during RVF investigations in sheep. These domestic animals should take a role in the life cycle of the virus but some evidences of Wesselsbron virus (WSLV) presence in wild animals suggest that the latter may be involved in the virus maintenance in nature...
June 2017: One Health
https://www.readbyqxmd.com/read/28615658/serotyping-dengue-virus-with-isothermal-amplification-and-a-portable-sequencer
#13
Junya Yamagishi, Lucky R Runtuwene, Kyoko Hayashida, Arthur E Mongan, Lan Anh Nguyen Thi, Linh Nguyen Thuy, Cam Nguyen Nhat, Kriengsak Limkittikul, Chukiat Sirivichayakul, Nuankanya Sathirapongsasuti, Martin Frith, Wojciech Makalowski, Yuki Eshita, Sumio Sugano, Yutaka Suzuki
The recent development of a nanopore-type portable DNA sequencer has changed the way we think about DNA sequencing. We can perform sequencing directly in the field, where we collect the samples. Here, we report the development of a novel method to detect and genotype tropical disease pathogens, using dengue fever as a model. By combining the sequencer with isothermal amplification that only requires a water bath, we were able to amplify and sequence target viral genomes with ease. Starting from a serum sample, the entire procedure could be finished in a single day...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28614803/delineating-antibody-recognition-against-zika-virus-during-natural-infection
#14
Lei Yu, Ruoke Wang, Fei Gao, Min Li, Jianying Liu, Jian Wang, Wenxin Hong, Lingzhai Zhao, Yingfen Wen, Chibiao Yin, Hua Wang, Qi Zhang, Yangyang Li, Panpan Zhou, Rudian Zhang, Yang Liu, Xiaoping Tang, Yongjun Guan, Cheng-Feng Qin, Ling Chen, Xuanling Shi, Xia Jin, Gong Cheng, Fuchun Zhang, Linqi Zhang
Zika virus (ZIKV) is an emerging mosquito-transmitted flavivirus that shares a considerable degree of homology with dengue virus (DENV). Here, we examined longitudinal antibody response against ZIKV during natural infection in 2 convalescent individuals. By decomposing the antibody recognition into DI/DII and DIII of the E glycoprotein, we showed their development in humans followed a spatiotemporal hierarchy. Plasma binding to DI/DII appeared to peak and wane during early infection with extensive cross-reactivity with DI/DII of DENV...
June 15, 2017: JCI Insight
https://www.readbyqxmd.com/read/28614453/dengue-infection-during-pregnancy-and-adverse-maternal-fetal-and-infant-health-outcomes-in-rio-branco-acre-state-brazil-2007-2012
#15
Helena Albuquerque Catão Feitoza, Sergio Koifman, Rosalina Jorge Koifman, Valéria Saraceni
The effects of dengue infection during pregnancy have not been previously studied in Rio Branco, Acre State, Brazil. The aim of this study was to determine the risks of maternal, fetal, and infant complications resulting from dengue infection during pregnancy. The study compared two cohorts of pregnant women, exposed versus unexposed to dengue virus, from 2007 to 2012. Incidence rates and risk ratios were estimated for maternal, fetal, and infant complications. In the exposed cohort there were 3 fetal deaths and 5 neonatal deaths...
June 12, 2017: Cadernos de Saúde Pública
https://www.readbyqxmd.com/read/28614394/first-report-of-naturally-infected-aedes-aegypti-with-chikungunya-virus-genotype-ecsa-in-the-americas
#16
André Luis Costa-da-Silva, Rafaella Sayuri Ioshino, Vivian Petersen, Antonio Fernando Lima, Marielton Dos Passos Cunha, Michael R Wiley, Jason T Ladner, Karla Prieto, Gustavo Palacios, Danuza Duarte Costa, Lincoln Suesdek, Paolo Marinho de Andrade Zanotto, Margareth Lara Capurro
BACKGROUND: The worldwide expansion of new emergent arboviruses such as Chikungunya and Zika reinforces the importance in understanding the role of mosquito species in spreading these pathogens in affected regions. This knowledge is essential for developing effective programs based on species specificity to avoid the establishment of endemic transmission cycles sustained by the identified local vectors. Although the first autochthonous transmission of Chikungunya virus was described in 2014 in the north of Brazil, the main outbreaks were reported in 2015 and 2016 in the northeast of Brazil...
June 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28613285/dengue-hemorrhagic-fever-in-the-northwest-of-mexico-a-two-decade-analysis
#17
Vania Serrano-Pinto, Manuel Moreno-Legorretara
BACKGROUND: In Baja California Sur, Mexico, there are no records of dengue hemorrhagic fever in the state before 1995. Until now, there have been no published reports on the incidence rate. OBJECTIVE: To assess the incidence rate of dengue hemorrhagic fever in Baja California Sur in the last two decades. METHODS: We analyzed data on the total number of cases in the general population, incidence rate, age groups, gender, serotypes, and mortality data...
May 2017: Revista de Investigación Clínica; Organo del Hospital de Enfermedades de la Nutrición
https://www.readbyqxmd.com/read/28612239/dengue-hemorrhagic-fever-a-state-of-the-art-review-focused-in-pulmonary-involvement
#18
REVIEW
Renata Rocha de Almeida, Bernardo Paim, Solange Artimos de Oliveira, Arthur Soares Souza, Antônio Carlos Portugal Gomes, Dante Luiz Escuissato, Gláucia Zanetti, Edson Marchiori
Dengue fever is an arboviral disease transmitted to humans through the bites of infected female Aedes mosquitoes. Dengue virus is a member of the Flaviviridae family, and human infection can be caused by any of the four antigenically distinct serotypes (DENV 1-4). The infection has become recognized as the most important and prevalent arboviral disease in humans, endemic in almost 100 countries worldwide. Nearly 3 billion people live in areas with transmission risk. Autochthonous transmission of the virus in previously disease-free areas, increased incidence in endemic areas, and epidemic resurgence in controlled regions could increase the risk of contracting more severe forms of the disease, such as dengue hemorrhagic fever (DHF)/dengue shock syndrome (DSS)...
June 13, 2017: Lung
https://www.readbyqxmd.com/read/28607841/ficus-septica-plant-extracts-for-treating-dengue-virus-in-vitro
#19
Nan-Chieh Huang, Wan-Ting Hung, Wei-Lun Tsai, Feng-Yi Lai, You-Sheng Lin, Mei-Shu Huang, Jih-Jung Chen, Wei-Yu Lin, Jing-Ru Weng, Tsung-Hsien Chang
Dengue virus types 1-4 (DENV-1-4) are positive-strand RNA viruses with an envelope that belongs to the Flaviviridae. DENV infection threatens human health worldwide. However, other than supportive treatments, no specific therapy is available for the infection. In order to discover novel medicine against DENV, we tested 59 crude extracts, without cytotoxicity, from 23 plants in vitro; immunofluorescence assay revealed that the methanol extracts of fruit, heartwood, leaves and stem from Ficus septica Burm. f...
2017: PeerJ
https://www.readbyqxmd.com/read/28604797/a-human-inferred-germline-antibody-binds-to-an-immunodominant-epitope-and-neutralizes-zika-virus
#20
Diogo M Magnani, Cassia G T Silveira, Brandon C Rosen, Michael J Ricciardi, Núria Pedreño-Lopez, Martin J Gutman, Varian K Bailey, Helen S Maxwell, Aline Domingues, Lucas Gonzalez-Nieto, Vivian I Avelino-Silva, Mateus Trindade, Juliana Nogueira, Consuelo S Oliveira, Alvino Maestri, Alvina Clara Felix, José Eduardo Levi, Mauricio L Nogueira, Mauricio A Martins, José M Martinez-Navio, Sebastian P Fuchs, Stephen S Whitehead, Dennis R Burton, Ronald C Desrosiers, Esper G Kallas, David I Watkins
The isolation of neutralizing monoclonal antibodies (nmAbs) against the Zika virus (ZIKV) might lead to novel preventative strategies for infections in at-risk individuals, primarily pregnant women. Here we describe the characterization of human mAbs from the plasmablasts of an acutely infected patient. One of the 18 mAbs had the unusual feature of binding to and neutralizing ZIKV despite not appearing to have been diversified by affinity maturation. This mAb neutralized ZIKV (Neut50 ~ 2 μg/ml) but did not react with any of the four dengue virus serotypes...
June 2017: PLoS Neglected Tropical Diseases
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