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https://www.readbyqxmd.com/read/28821561/zika-virus-activates-de-novo-and-cross-reactive-memory-b-cell-responses-in-dengue-experienced-donors
#1
Thomas F Rogers, Eileen C Goodwin, Bryan Briney, Devin Sok, Nathan Beutler, Alexander Strubel, Rebecca Nedellec, Khoa Le, Michael E Brown, Dennis R Burton, Laura M Walker
Zika virus (ZIKV) shares a high degree of homology with dengue virus (DENV), suggesting that preexisting immunity to DENV could affect immune responses to ZIKV. We have tracked the evolution of ZIKV-induced B cell responses in three DENV-experienced donors. The acute antibody (plasmablast) responses were characterized by relatively high somatic hypermutation and a bias toward DENV binding and neutralization, implying the early activation of DENV clones. A DENV-naïve donor in contrast showed a classical primary plasmablast response...
August 18, 2017: Science Immunology
https://www.readbyqxmd.com/read/28821226/comprehensive-proteome-profiling-in-aedes-albopictus-to-decipher-wolbachia-arbovirus-interference-phenomenon
#2
Yoann Saucereau, Claire Valiente Moro, Cindy Dieryckx, Jean-William Dupuy, Florence-Hélène Tran, Vincent Girard, Patrick Potier, Patrick Mavingui
BACKGROUND: Aedes albopictus is a vector of arboviruses that cause severe diseases in humans such as Chikungunya, Dengue and Zika fevers. The vector competence of Ae. albopictus varies depending on the mosquito population involved and the virus transmitted. Wolbachia infection status in believed to be among key elements that determine viral transmission efficiency. Little is known about the cellular functions mobilized in Ae. albopictus during co-infection by Wolbachia and a given arbovirus...
August 18, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28820720/dengue-virus-serotypes-1-and-2-responsible-for-major-dengue-outbreaks-in-nepal-clinical-laboratory-and-epidemiological-features
#3
Shyam Prakash Dumre, Renu Bhandari, Geeta Shakya, Sanjay Kumar Shrestha, Mahamoud Sama Cherif, Prakash Ghimire, Chonticha Klungthong, In-Kyu Yoon, Kenji Hirayama, Kesara Na-Bangchang, Stefan Fernandez
Dengue virus (DENV) is expanding toward previously nonendemic areas. DENV has recently been introduced in Nepal with limited information. We report the clinical features and serotype distribution of DENV in Nepal during the major outbreaks. A total of 1,215 clinical dengue cases at two major hospitals of central and western Nepal were investigated. Demographic, clinical, and laboratory parameters were recorded. Serum specimens were tested for DENV by IgM/IgG enzyme-linked immunosorbent assays (ELISAs) and reverse transcription polymerase chain reaction (RT-PCR)...
July 31, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28820715/limited-transmission-potential-of-takeda-s-tetravalent-dengue-vaccine-candidate-by-aedes-albopictus
#4
Elizabeth A Dietrich, Yee Tsuey Ong, Janae L Stovall, Hansi Dean, Claire Y-H Huang
Recombinant live-attenuated chimeric tetravalent dengue vaccine viruses, TDV-1, -2, -3, and -4, contain the premembrane and envelope genes of dengue virus serotypes 1-4 in the replicative background of the attenuated dengue virus type-2 (DENV-2) PDK-53 vaccine strain. Previous results have shown that these recombinant vaccine viruses demonstrate limited infection and dissemination in Aedes aegypti and are unlikely to be transmitted by the primary mosquito vector of DENVs. In this report, we expand this analysis by assessing vector competence of all four serotypes of the TDV virus in Aedes albopictus, the secondary mosquito vector of DENVs...
August 14, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28818423/design-and-synthesis-of-multiple-antigenic-peptides-and-their-application-for-dengue-diagnosis
#5
Reeta Rai, Sameer Dubey, K V Santosh, Ashutosh Biswas, Vinit Mehrotra, D N Rao
Major difficulty in development of dengue diagnostics is availability of suitable antigens. To overcome this, we made an attempt to develop a peptide based diagnosis which offers significant advantage over other methods. With the help of in silico methods, two epitopes were selected from envelope protein and three from NS1 protein of dengue virus. These were synthesized in combination as three multiple antigenic peptides (MAPs). We have tested 157 dengue positive sera confirmed for NS1 antigen. MAP1 showed 96...
August 14, 2017: Biologicals: Journal of the International Association of Biological Standardization
https://www.readbyqxmd.com/read/28817563/assessment-of-risk-of-dengue-and-yellow-fever-virus-transmission-in-three-major-kenyan-cities-based-on-stegomyia-indices
#6
Sheila B Agha, David P Tchouassi, Armanda D S Bastos, Rosemary Sang
Dengue (DEN) and yellow fever (YF) are re-emerging in East Africa, with contributing drivers to this trend being unplanned urbanization and increasingly adaptable anthropophilic Aedes (Stegomyia) vectors. Entomological risk assessment of these diseases remains scarce for much of East Africa and Kenya even in the dengue fever-prone urban coastal areas. Focusing on major urban cities of Kenya, we compared DEN and YF risk in Kilifi County (DEN-outbreak-prone), and Kisumu and Nairobi Counties (no documented DEN outbreaks)...
August 17, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28815931/organization-of-the-flavivirus-rna-replicase-complex
#7
REVIEW
Carolin Brand, Martin Bisaillon, Brian J Geiss
Flaviviruses, such as dengue, Japanese encephalitis, West Nile, yellow fever, and Zika viruses, are serious human pathogens that cause significant morbidity and mortality globally each year. Flaviviruses are single-stranded, positive-sense RNA viruses, and encode two multidomain proteins, NS3 and NS5, that possess all enzymatic activities required for genome replication and capping. NS3 and NS5 interact within virus-induced replication compartments to form the RNA genome replicase complex. Although the individual enzymatic activities of both proteins have been extensively studied and are well characterized, there are still gaps in our understanding of how they interact to efficiently coordinate their respective activities during positive-strand RNA synthesis and capping...
August 16, 2017: Wiley Interdisciplinary Reviews. RNA
https://www.readbyqxmd.com/read/28808809/evidence-of-dengue-virus-replication-in-a-non-traumatic-spleen-rupture-case
#8
Luiz José de Souza, João de Azevedo, Liza Ingride Acha Kohler, Lorena de Freitas Barros, Mariana Arêdes Lima, Emiliana Mandarano Silva, Ronaldo Mohana-Borges, Priscila Conrado Guerra Nunes, Marciano Viana Paes
The present report describes a case of splenic rupture due to dengue, a rare complication of dengue that should be considered in any patient with suspected dengue disease who started with left upper quadrant abdominal pain and hypotension. The pathophysiology of this entity is not yet well elucidated, but one of the theories present in the literature is that it is due to a depletion of coagulation factors and platelets leading to intra-splenic hemorrhage and rupture. The RT-PCR technique detected serotype 1 and histopathological studies of the spleen revealed significant atrophy of lymphoid follicles and extensive hemorrhage areas...
August 14, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28805637/wolbachia-mediated-virus-blocking-in-the-mosquito-vector-aedes-aegypti
#9
REVIEW
Gerard Terradas, Elizabeth A McGraw
Viruses transmitted by mosquitoes such as dengue, Zika and West Nile cause a threat to global health due to increased geographical range and frequency of outbreaks. The bacterium Wolbachia pipientis may be the solution reducing disease transmission. Though commonly missing in vector species, the bacterium was artificially and stably introduced into Aedes aegypti to assess its potential for biocontrol. When infected with Wolbachia, mosquitoes become refractory to infection by a range of pathogens, including the aforementioned viruses...
August 2017: Current Opinion in Insect Science
https://www.readbyqxmd.com/read/28802204/humanized-mouse-models-to-study-human-cell-mediated-and-humoral-responses-to-dengue-virus
#10
REVIEW
Anuja Mathew
Several candidate dengue virus vaccines are in clinical trials and show promise as an effective measure to control dengue. However, it is becoming clear that additional vaccine candidates may be needed as there is concern about the durability of the immune response to all four serotypes of vaccine components and efficacy varies dependent on the immune status of the individual. The lack of an appropriate animal model to mimic human dengue has deterred the development of vaccines and anti-viral therapies to dengue virus...
August 9, 2017: Current Opinion in Virology
https://www.readbyqxmd.com/read/28798927/is-dengue-emerging-as-important-cause-of-acute-liver-failure-in-endemic-regions
#11
Lavleen Singh, Amitabh Singh, Mitali Agarwal, Sataroopa Mishra
Dengue virus infection continues to be major public health problem in large part of world. The epidemiology of dengue viral infection is becoming increasingly complex and has substantially changed over almost past six decades not only in terms of prevalent strains and geographical locations but also in terms of disease severity and atypical presentations. Though liver is the most common organ affected but is generally asymptomatic. We present a case of infant with severe dengue who died of fulminant hepatic failure and showed pan lobular necrosis on post mortem liver biopsy...
July 16, 2017: World Journal of Clinical Cases
https://www.readbyqxmd.com/read/28798738/zika-virus-an-emerging-worldwide-threat
#12
Irfan A Rather, Jameel B Lone, Vivek K Bajpai, Woon K Paek, Jeongheui Lim
ZIKA virus (ZIKV) poses a severe threat to the world. Recent outbreaks of ZIKV after 2007 along with its quick transmission have made this virus a matter of international concern. The virus shows symptoms that are similar to those caused in the wake of dengue virus (DENV) and other flaviviruses, which makes it difficult to discern the viral infection. Diagnosis is further complicated as the virus cross-reacts with antibodies of other viruses. Currently, molecular diagnosis of the virus is being performed by RT-PCR and IgM-captured enzyme-linked immunosorbent assay (MAC-ELISA)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28796789/multiple-introductions-of-the-dengue-vector-aedes-aegypti-into-california
#13
Evlyn Pless, Andrea Gloria-Soria, Benjamin R Evans, Vicki Kramer, Bethany G Bolling, Walter J Tabachnick, Jeffrey R Powell
The yellow fever mosquito Aedes aegypti inhabits much of the tropical and subtropical world and is a primary vector of dengue, Zika, and chikungunya viruses. Breeding populations of A. aegypti were first reported in California (CA) in 2013. Initial genetic analyses using 12 microsatellites on collections from Northern CA in 2013 indicated the South Central US region as the likely source of the introduction. We expanded genetic analyses of CA A. aegypti by: (a) examining additional Northern CA samples and including samples from Southern CA, (b) including more southern US populations for comparison, and (c) genotyping a subset of samples at 15,698 SNPs...
August 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28794424/virus-like-particles-that-display-zika-virus-envelope-protein-domain-iii-induce-potent-neutralizing-immune-responses-in-mice
#14
Ming Yang, Huafang Lai, Haiyan Sun, Qiang Chen
Several Zika virus (ZIKV) vaccine candidates have recently been described which use inactivated whole virus, DNA or RNA that express the virus' Envelope (E) glycoprotein as the antigen. These were successful in stimulating production of virus-targeted antibodies that protected animals against ZIKV challenges, but their use potentially will predispose vaccinated individuals to infection by the related Dengue virus (DENV). We have devised a virus like particle (VLP) carrier based on the hepatitis B core antigen (HBcAg) that displays the ZIKV E protein domain III (zDIII), and shown that it can be produced quickly and easily purified in large quantities from Nicotiana benthamiana plants...
August 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28794181/a-neutralization-assay-for-zika-and-dengue-viruses-using-a-real-time-pcr-based-endpoint-assessment
#15
Heather L Wilson, Thomas Tran, Julian Druce, Myrielle Dupont-Rouzeyrol, Michael Catton
The global spread and infective complications of Zika virus (ZKV) and Dengue virus (DENV) have made them flaviviruses of public health concern. Serological diagnosis can be challenging due to antibody cross-reactivity, particularly in secondary flavivirus infections or when there is a history of flavivirus vaccination. The virus neutralization assay is considered to be the most specific assay for measurement of anti-flavivirus antibodies. This study describes an assay where neutralization endpoint is measured by real-time PCR, providing results within 72 hours...
August 9, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28793920/dengue-1-virus-and-vector-competence-of-aedes-aegypti-diptera-culicidae-populations-from-new-caledonia
#16
Elodie Calvez, Laurent Guillaumot, Dominique Girault, Vaea Richard, Olivia O'Connor, Tuterarii Paoaafaite, Magali Teurlai, Nicolas Pocquet, Van-Mai Cao-Lormeau, Myrielle Dupont-Rouzeyrol
BACKGROUND: Dengue virus (DENV) is the arbovirus with the highest incidence in New Caledonia and in the South Pacific region. In 2012-2014, a major DENV-1 outbreak occurred in New Caledonia. The only known vector of DENV in New Caledonia is Aedes aegypti but no study has yet evaluated the competence of New Caledonia Ae. aegypti populations to transmit DENV. This study compared the ability of field-collected Ae. aegypti from different locations in New Caledonia to transmit the DENV-1 responsible for the 2012-2014 outbreak...
August 9, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28793020/intelligent-monitoring-of-aedes-aegypti-in-a-rural-area-of-rio-de-janeiro-state-brazil
#17
Argemiro Sanavria, Claudia Bezerra da Silva, Érica Heleno Electo, Lidiane Cristina Rocha Nogueira, Sandra Maria Gomes Thomé, Isabele da Costa Angelo, Gilmar Ferreira Vita, Talles Eduardo Cabral Sanavria, Elisa Domingues Padua, Denise Glória Gaiotte
The aim of this research was to monitor the presence of females of Aedes aegypti (Linnaeus, 1762) on the Seropédica municipality, Rio de Janeiro State, from 2010 to 2013. For this purpose, the Intelligent Dengue Monitoring (IM-Dengue) and Intelligent Virus Monitoring (IM-Virus) developed by Universidade Federal de Minas Gerais (Ecovec - Minas Gerais, Brazil), were used. IM-Dengue is a tool that allows achieving a weekly overview of A. aegypti infestation, while IM-Virus is another tool that allows detecting dengue virus directly from the mosquito, by Real Time-PCR...
2017: Revista do Instituto de Medicina Tropical de São Paulo
https://www.readbyqxmd.com/read/28791613/oleic-acid-enhances-dengue-virus-but-not-dengue-virus-like-particle-production-from-mammalian-cells
#18
Suwipa Ramphan, Sathiporn Suksathan, Nitwara Wikan, Puey Ounjai, Kanpong Boonthaworn, Poramate Rimthong, Tapanee Kanjanapruthipong, Suchin Worawichawong, Anan Jongkaewwattana, Nuttaporn Wongsiriroj, Duncan R Smith
Despite the recent introduction of a commercial vaccine, the mosquito-transmitted dengue virus is still a worldwide public health problem. Based on the live attenuated vaccine strategy, the commercial vaccine has a less than optimal protective profile. Virus-like particles (VLPs) offer an attractive alternate vaccination strategy due to the effectively native presentation of epitopes in the absence of any infectious genetic material. However, the production of amounts of VLP in a platform that can support commercial development remains a major obstacle...
August 8, 2017: Molecular Biotechnology
https://www.readbyqxmd.com/read/28791258/prevention-and-control-strategies-to-counter-dengue-virus-infection
#19
REVIEW
Irfan A Rather, Hilal A Parray, Jameel B Lone, Woon K Paek, Jeongheui Lim, Vivek K Bajpai, Yong-Ha Park
Dengue is currently the highest and rapidly spreading vector-borne viral disease, which can lead to mortality in its severe form. The globally endemic dengue poses as a public health and economic challenge that has been attempted to suppress though application of various prevention and control techniques. Therefore, broad spectrum techniques, that are efficient, cost-effective, and environmentally sustainable, are proposed and practiced in dengue-endemic regions. The development of vaccines and immunotherapies have introduced a new dimension for effective dengue control and prevention...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28791126/investigation-of-sphingosine-kinase-1-in-interferon-responses-during-dengue-virus-infection
#20
Amanda L Aloia, Julie K Calvert, Jennifer N Clarke, Lorena T Davies, Karla J Helbig, Stuart M Pitson, Jillian M Carr
Dengue virus (DENV) regulates sphingosine kinase (SK)-1 activity and chemical inhibition of SK1 reduces DENV infection. In primary murine embryonic fibroblasts (pMEFs) lacking SK1 however, DENV infection is enhanced and this is associated with induction of normal levels of interferon beta (IFN-β) but reduced levels of IFN-stimulated genes (ISGs). We have further investigated this link between SK1 and type I IFN responses. DENV infection downregulates cell-surface IFN-alpha receptor (IFNAR)1 in both wild-type (WT) and SK1(-)(/-) pMEF, but, consistent with poor ISG responses, shows reduced induction of phosphorylated (p)-STAT1 and key IFN regulatory factors (IRF)1 and -7 in SK1(-/-) pMEF...
July 2017: Clinical & Translational Immunology
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