Dengue virus (DENV) is the cause of dengue fever.It is a mosquito-borne, single positive-stranded RNA virus of the family Flaviviridae; genus Flavivirus. Dr. Rebeca Rico-Hesse’s laboratory is studying the structural (RNA and/or protein) and transmission (replication in Aedes aegypti) characteristics of dengue type 2 and type 3 virus variants that have produced dengue hemorrhagic fever in humans throughout the world. Rhesus monkeys develop viremia similar in pattern to humans after dengue virus challenge but do not develop clinical disease. Mosquito-borne flaviviruses, including dengue virus (DENV) and Zika virus (ZIKV), are a growing public health concern. DENV infection can cause mild dengue fever or severe dengue hemorrhagic fever (DHF)/dengue shock syndrome (DSS). Several hypotheses have emerged to explain why DHF occurs in someindividuals who are infected with dengue viruses. Major changes in the epidemiology of dengue virus infections began after World War II, and geographic expansion of transmission has continued to date. Introduction Dengue is an arthropod-borne viral disease caused by the four dengue virus serotypes (DENV 1–4), which are Dengue viruses (DENV) cause a spectrum of disease in humans, ranging from dengue fever (DF) to a severe, life-threatening syndrome called dengue hemorrhagic fever/dengue shock syndrome (DHF/DSS). Objective Dengue fever is one of the most important arboviral diseases in the world, and its severe forms are characterised by a broad spectrum of systemic and cardiovascular hallmarks. Nevertheless, scientists' understanding of dengue virus may be simplistic, as rather than distinct antigenic groups, a continuum appears to exist. These include (1) Dengue virus is a positive sense RNA virus of the flavivirus family with at least four distinct serotypes. Unfortunately, progress towards development of effective therapeutics has been slow, despite notable advances in the understanding of disease pathogenesis and considerable investment in antiviral drug discovery. Five serotypes of the virus have been found, all of which can cause the full spectrum of disease. The free Herein, we evaluated the cardiac outcomes unleashed by DENV infection and … A major factor that is considered responsible for severe dengue pathogenesis is Bardina et al. The most serious form of dengue infection is known as den… Dengue is caused by one of four related serotypes of dengue virus and often leads to severe forms of the disease, resulting commonly from secondary infections. When macrophages consume the ‘neutralized’ virus, the virus is able to replicate within the macrophage, causing disease. These cross-reactive, ineffective antibodies ease access of virus into macrophages, which induces more severe disease (dengue hemorrhagic fever, dengue shock syndrome). Structure and transmission of dengue virus. [ 17] The understanding of dengue virus pathogenesis has been hamppered by the lack of in vitro and in vivo models of disease.There are several theories that are supported by epidemiological and laboratory evidence, but are not mutually exclusive. Dengue virus (DENV) is the most medically important arbovirus worldwide, and infection with any of the four serotypes (DENV1-4) can lead to a range of outcomes, from inapparent infection to dengue fever (DF) to dengue hemorrhagic fever/dengue shock syndrome (DHF/DSS), severe disease manifestations are characterized by endothelial barrier dysfunction and vascular leak. As both cell tropism and tissue tropism of DENV are considered major determinants in the pathogenesis of dengue, there is a critical need for adequate tropism assays, animal models, and human autopsy data. Dengue fever is a mosquito-borne viral disease caused by 1 of 4 closely related but antigenically distinct serotypes of dengue virus, serotypes DENV-1 through DEN-4. Systems-level analysis of how flaviviruses hijack cellular processes through virus-host protein-protein interactions (PPIs) provides information … SUMMARY Much remains to be learned about the pathogenesis of the different manifestations of dengue virus (DENV) infections in humans. They may range from subclinical infection to dengue fever, dengue hemorrhagic fever (DHF), and eventually dengue shock syndrome (DSS). Dengue is a mosquito-borne viral infection that usually causes a self-limited febrile illness, but can give rise to dengue hemorrhagic fever or dengue shock syndrome. 1 antibody blocks dengue virus infection in mice. They may range from subclinical infection to dengue fever, dengue hemorrhagic fever (DHF), and eventually dengue shock syndrome (DSS). The mechanisms of pathogenesis of Dengue remain elusive. "This research is the proof of concept that you can target this one protein for multiple flaviviruses to protect against pathogenesis. Zika virus (ZIKV) is a re-emerging virus that has recently spread into dengue virus (DENV) endemic regions and cross-reactive antibodies (Abs) could potentially affect ZIKV pathogenesis… One reason no effective therapeutic has been found for dengue is that the disease can be caused by one of four different virus strains (dengue virus 1, 2, 3 or 4). Population growth and expansion of habitats for the virus-carrying vector—the Aedes mosquito—coupled with the ease of international travel have aligned, in space and time, populations of dengue-susceptible hosts (humans) with circulating dengue viruses (DENVs) and the mosquitoes … Dengue virus infection is a rapidly expanding public health problem of the tropics and subtropics. Insights into the pathogenesis of severe dengue Mortality from severe dengue is low, but the economic and resource burden on health services remains substantial in endemic settings. Despite the global morbidity and mortality associated with DENV infection, mechanisms of immune control and viral pathogenesis are poorly understood. Cytokines such as tumour necrosis factor-α, which are known to be elevated in the critical phase of dengue, are likely to be contributing factors. However, much remains to be elucidated regarding the pathogenesis triggered by Dengue virus (DENV) in the heart. Antibodies against related flavi-viruses such as dengue (DENV) and West Nile (WNV) can cross-react with Zika virus (ZIKV) and could thereby increase disease severity. As both cell tropism and tissue tropism of DENV are considered major determinants in the pathogenesis of dengue, there is a critical need for adequate tropism assays, animal models, and human autopsy data. Apart from NS1 protein, anti-DENV NS1 antibodies were believed to be responsible for pathogenesis of severe dengue. The mechanism of disease pathogenesis is not completely understood, and there are currently no vaccines or therapeutic drugs available to protect against all … One recent (2013) estimate indicates that 390 million dengue infections occur every year (95% credible interval 284–528 million), of which 96 million (67–136 million) manifest clinically (with any severity of disease). Role of nitric oxide in the pathogenesis of dengue Dengue Bulletin – Volume 31, 2007 121 Nitric oxide and apoptosis The dengue virus may be an apoptosis inducer by direct or indirect mechanisms. Dengue is an enveloped virus, 40-60 nm in size, with an isometric nucleocapsid of 25-30 nm and an ~10.7 kb, linear, positive-sense RNA genome 4. Dengue virus exists as four serotypes (Dengue 1–4) and is genetically related to other flaviviruses such as yellow fever and tick-borne encephalitis viruses tested whether DENV and WNV antibodies from humans, or even yellow fever vaccination, could enhance ZIKV infection. Answer. They may range from subclinical infection to dengue fever, dengue hemorrhagic fever (DHF), and eventually dengue shock syndrome (DSS). Zika virus (ZIKV) is an arthropod-borne flavivirus in the family Flaviviridae, which includes several other arthropod-borne viruses of clinical importance, such as dengue virus (DENV), West Nile virus (WNV), and yellow fever virus (YFV) . Dengue virus (DENV) infection is the most common mosquito-transmitted viral infection. Dengue and Dengue hemorrhagic fever have emerged as some of the most important mosquito-borne viral diseases in the tropics. ZIKV is a positive-sense single-stranded enveloped RNA virus. However, due to the limited understanding of dengue pathogenesis, no satisfactory therapies to treat … Annually, 100 million cases of dengue fever and half a million cases of DHF occur worldwide. has also seen an upsurge in research on dengue virology, pathogenesis, and immunology and in development of antivirals, vaccines, and new vector-control strategies that can positively impact dengue control and prevention. This severe syndrome, which recently has … In a mouse model, low titers of DENV and WNV antibodies enhanced ZIKV viremia, … These may include a high fever, headache, vomiting, muscle and joint pains, and a characteristic skin rash. We evaluated the role of CC chemokine receptors CCR1, CCR2 and CCR4 in an experimental model of DENV-2 infection in mice. These viruses generally cause a benign syndrome, dengue fever, in the American and African tropics, and a severe syndrome, dengue hemorrhagic fever/dengue shock syndrome (DHF/DSS), in Southeast Asian children. Consequently, infection is amplified and virus is disseminated through the lymphatic system. 22, 2009 DENGUE VIRUS PATHOGENESIS 565 the gastrointestinal tract, leading to anoxia, cell death, and stander DC are stimulated to produce the bulk of mediators gastrointestinal bleeding. prolonged shock resulting in blood being shunted away from 564 fVOL. They may be asymptomatic or may give rise to undifferentiated fever, dengue fever, dengue haemorrhagic fever (DHF), or dengue shock syndrome. Recently, virus-induced apoptosis mediated by the Unfolded Protein Response (UPR) has been hypothesised to represent a crucial pathogenic event in viral infection. Infection of Mo/MΦ or endothelial cells with DENV results in apoptosis;[30-32] however, the mechanisms of apoptosis induction remain unclear. This is usually due to @erasmusmc.nl. It is the cause of dengue fever which is associated with headache, retro-orbital pain, joint and bone pain (hence "breakbone fever"), fever and rash. Dengue is a positive stranded RNA arbovirus transmitted by mosquitoes typically Aedes aegypti.Dengue fever has spread from the border lands of Texas to South and Central America, from Africa to the Middle East to Indonesia and Australia. Dengue virus (DENV) is a mosquito-borne arbovirus that causes febrile illness and can lead to a potentially lethal disease. In this issue of Science Translational Medicine , Modhiran et al. In large part, this limitation is related to the lack of a suitable animal model of disease . Abstract Dengue viral infections are one of the most important mosquito borne diseases in the world. Dengue viruses occur as four antigenically related but distinct serotypes transmitted to humans by Aedes aegypti mosquitoes. Recent clinical data have shown an association between levels of different chemokines in plasma and severity of dengue. Slowly, individual and disparate pieces of the dengue pathogen-esis puzzle have been discovered and put in place. Dengue virus (DENV), a mosquito-borne flavivirus, is a public health problem in many tropical countries. There are currently no specific treatments, though a vaccine was recently licensed for use in limited countries. Dengue NS1, a soluble viral protein, has also been shown to disrupt the endothelial glycocalyx and thus contribute to vascular leak, although there appears to be a discordance between the timing of NS1 antigenaemia and occurrence of vascular leak. As a … (2) and Beatty et Recovery generally takes two to seven days. https://www.frontiersin.org/articles/10.3389/fimmu.2014.00151 Substantial gaps remain in the comprehensive understanding of the pathogenesis of dengue virus infections. There are an estimated 50 million infections per year with the dengue virus, which is transmitted primarily by urban-adapted Aedes aegypti mosquitoes. Dengue virus after entering in the body invades the local macrophages and multiply there. Infected local cells then migrate from site of infection to lymph nodes, where monocytes and macrophages are recruited, which become targets of infection. Consequently, infection is amplified and virus is disseminated through the lymphatic system. Symptoms typically begin three to fourteen days after infection. in dengue pathogenesis Shu-Wen Wan1, Betty A. Wu-Hsieh2, Yee-Shin Lin3,4, Wen-Yu Chen2, Yan Huang5 and Robert Anderson3,5,6* Abstract Dengue virus, the causative agent of dengue disease which may have hemorrhagic complications, poses a global health threat. Records of dengue-like illness date back more than 200 years; the viral etiology of dengue virus was established in the 1940s [ 1,2 ]. and macrophages. Dengue fever is a mosquito-borne tropical disease caused by the dengue virus. through dengue virus type 4), also referred to as serotypes) of the genus flavivirus (family Flavi-viridae). Having antibodies against one strain of the virus can actually increase severity of a subsequent infection from another strain, a phenomenon called antibody-dependent enhancement. the pathogenesis of severe dengue has in-trigued and stymied clinicians, basic scien-tists, dengue vaccine and drug developers, and epidemiologists. Once inside the cell, the virus replicates and generates higher virus titers in the blood than when anti -DENV antibody is not present, which results in a “cytokine storm” and ultimately leading to more severe disease. The Dengue Virus is a member of the family Flaviviridae along with other noted viruses Yellow Fever, West Nile, and Japanese Encephalitis. Dengue virus is a mosquito borne virus, belongs to the family Flaviviridae and consists of a single stranded positive sense RNA genome. Hemorrhage and vascular leakage are two characteristic symptoms of DHF/DSS. 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