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Dengue fever

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https://www.readbyqxmd.com/read/29352990/low-socioeconomic-condition-and-the-risk-of-dengue-fever-a-direct-relationship
#1
Elaine Cristina Farinelli, Oswaldo Santos Baquero, Celso Stephan, Francisco Chiaravalloti-Neto
This study aimed to characterize the first dengue fever epidemic in Várzea Paulista, São Paulo, Brazil, and its spatial and spatio-temporal distribution in order to assess the association of socioeconomic factors with dengue occurrence. We used autochthonous dengue cases confirmed in a 2007 epidemic, the first reported in the city, available in the Information System on Diseases of Compulsory Declaration database. These cases where geocoded by address. We identified spatial and spatio-temporal clusters of high- and low-risk dengue areas using scan statistics...
January 15, 2018: Acta Tropica
https://www.readbyqxmd.com/read/29351663/mini-review-can-non-human-leucocyte-antigen-genes-determine-susceptibility-to-severe-dengue-syndromes
#2
Dorothy Ng, Aparna Ghosh, Mark Jit, Suranjith L Seneviratne
Dengue viral infections are endemic or epidemic in virtually all tropical countries. Among individuals infected with the dengue virus, severe dengue syndromes (i.e., dengue haemorrhagic fever and dengue shock syndromes) tend to affect only some and this may be due to a combination of host genetic susceptibility and viral factors. In this review article we analyse and discuss the present knowledge of non-human leucocyte antigen host genetic susceptibility to severe dengue syndromes. The relevance of genetic polymorphisms in the pathways of antigen recognition, uptake, processing and presentation, activation of interferon α responses, mast cell and complement activation and T cell activation and dengue disease severity has been reviewed and analysed...
January 17, 2018: Transactions of the Royal Society of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29346061/two-cases-of-dengue-fever-imported-from-egypt-to-russia-2017
#3
Muhammad A Saifullin, Victor P Laritchev, Yana E Grigorieva, Nadezhda N Zvereva, Anna M Domkina, Ruslan F Saifullin, Marina V Bazarova, Yulia A Akinshina, Ludmila S Karan, Aleksandr M Butenko
In 2017, two cases of dengue fever were imported from Hurghada, Egypt, where dengue fever was not considered endemic, to Moscow. These cases show how emergence of dengue fever in popular resort regions on the coast of the Red Sea can spread infection to countries where it is not endemic.
April 17, 2018: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/29345964/immune-response-to-dengue-and-zika
#4
Annie Elong Ngono, Sujan Shresta
Flaviviruses such as dengue (DENV), yellow fever (YFV), West Nile (WNV), and Zika (ZIKV) are human pathogens of global significance. In particular, DENV causes the most prevalent mosquito-borne viral diseases in humans, and ZIKV emerged from obscurity into the spotlight in 2016 as the etiologic agent of congenital Zika syndrome. Owing to the recent emergence of ZIKV as a global pandemic threat, the roles of the immune system during ZIKV infections are as yet unclear. In contrast, decades of DENV research implicate a dual role for the immune system in protection against and pathogenesis of DENV infection...
January 18, 2018: Annual Review of Immunology
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/29339224/emerging-souvenirs-clinical-presentation-of-the-returning-traveller-with-imported-arbovirus-infections-in-europe
#6
Isabella Eckerle, Violeta Briciu, Onder Ergonul, Mihaela Lupse, Anna Papa, Amanda Radulescu, Sotirios Tsiodras, Christine Tsitou, Christian Drosten, Véronique Nussenblatt, Chantal Reusken, Louise Sigfrid, Nick J Beeching
BACKGROUND: Arboviruses are an emerging group of viruses that are causing increasing health concerns globally, including in Europe. Clinical presentation usually consists of a non-specific febrile illness that may be accompanied by rash, arthralgia and arthritis and/or with neurological or haemorrhagic syndromes. The range of differential diagnoses of other infectious and non-infectious aetiologies is broad, presenting a challenge for physicians. While knowledge of the geographic distribution of pathogens and the current epidemiological situation, incubation periods, exposure risk factors and vaccination history can help guide the diagnostic approach, the non-specific and variable clinical presentation can delay final diagnosis...
January 12, 2018: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/29338803/socio-demographic-inequalities-in-the-clinical-characteristics-of-dengue-haemorrhagic-fever-in-the-city-of-rio-de-janeiro-brazil-2007-2008
#7
Sheila Moura Pone, Yara Hahr Marques Hökerberg, Patricia Brasil, Cecília Carmen de Araújo Nicolai, Rogério Ferrari, Raquel de Vasconcellos Carvalhaes de Oliveira
In 2007-2008, the city of Rio de Janeiro underwent an epidemiological change, with increases in the incidence in children and in severe forms of dengue. To describe the clinical profile and spatial distribution of dengue we performed an ecological study based on dengue surveillance data using the Brazilian classification (2005): dengue fever, dengue haemorrhagic fever (DHF) and dengue with complications. χ 2 test was used to describe the clinical and socio-demographic variables (P < 0.05). Spatial distribution of incidence and case-fatality was explored with thematic maps, Moran and Geary indices (P < 0...
January 17, 2018: Epidemiology and Infection
https://www.readbyqxmd.com/read/29338543/lucidone-suppresses-dengue-viral-replication-through-the-induction-of-heme-oxygenase-1
#8
Wei-Chun Chen, Chin-Kai Tseng, Chun-Kuang Lin, Shen-Nien Wang, Wen-Hung Wang, Shih-Hsien Hsu, Yu-Hsuan Wu, Ling-Chien Hung, Yen-Hsu Chen, Jin-Ching Lee
Dengue virus (DENV) infection causes life-threatening diseases such as dengue hemorrhagic fever and dengue shock syndrome. Currently, there is no effective therapeutic agent or vaccine against DENV infection; hence, there is an urgent need to discover anti-DENV agents. The potential therapeutic efficacy of lucidone was first evaluated in vivo using a DENV-infected Institute of Cancer Research (ICR) suckling mouse model by monitoring body weight, clinical score, survival rate, and viral titer. We found that lucidone effectively protected mice from DENV infection by sustaining survival rate and reducing viral titers in DENV-infected ICR suckling mice...
January 17, 2018: Virulence
https://www.readbyqxmd.com/read/29332210/pathogen-specific-leptospiral-proteins-in-urine-of-patients-with-febrile-illness-aids-in-differential-diagnosis-of-leptospirosis-from-dengue
#9
R Chaurasia, K C Thresiamma, C K Eapen, B J Zachariah, R Paul, M Sritharan
Leptospirosis and dengue are two commonly seen infectious diseases of the tropics. Differential diagnosis of leptospirosis from dengue fever is often difficult due to overlapping clinical symptoms and lack of economically viable and easy-to-perform laboratory tests. The gold standard for diagnosis is the microscopic agglutination test (MAT). In this study, the diagnostic potential of screening for pathogen-specific leptospiral antigens in urine samples is presented as a non-invasive method of disease diagnosis...
January 13, 2018: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/29331320/zika-dengue-and-yellow-fever-viruses-induce-differential-anti-viral-immune-responses-in-human-monocytic-and-first-trimester-trophoblast-cells
#10
Huanle Luo, Evandro R Winkelmann, Ildefonso Fernandez-Salas, Li Li, Sandra V Mayer, Rogelio Daniz-Lozano, Rosa Ma Sanchez-Casas, Nikos Vasilakis, Robert Tesh, Alan D Barrett, Scott C Weaver, Tian Wang
Zika virus (ZIKV) is a mosquito-borne flavivirus associated with severe neonatal birth defects, but the causative mechanism is incompletely understood. ZIKV shares sequence homology and early clinical manifestations with yellow fever virus (YFV) and dengue virus (DENV) and are all transmitted in urban cycles by the same species of mosquitoes. However, YFV and DENV have been rarely reported to cause congenital diseases. Here, we compared infection with a contemporary ZIKV strain (FSS13025) to YFV17D and DENV-4 in human monocytic cells (THP-1) and first-trimester trophoblasts (HTR-8)...
January 10, 2018: Antiviral Research
https://www.readbyqxmd.com/read/29331008/atypical-presentation-of-rickettsial-spotted-fever
#11
Uday Prabhakar, Anup Singh
Acute febrile illness is a common entity in tropics and often is challenging due a host of pathogenic bacteria, viruses and fungi. Extensive work up is required for better management. Rickettsiosis is uncommon and hence comes lower down in the differentials of multiorgan failure being superseded by the more common diseases as malaria, enteric fever and Dengue. We document a case of young male presenting with high grade fever, multiorgan dysfunction (hepatic, renal, neurological and respiratory involvement), conjunctival suffusion, retiform rash and without lymphadenopathy...
October 2017: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/29330423/t-cell-immunity-to-zika-virus-targets-immunodominant-epitopes-that-show-cross-reactivity-with-other-flaviviruses
#12
C J Reynolds, O M Suleyman, A M Ortega-Prieto, J K Skelton, P Bonnesoeur, A Blohm, V Carregaro, J S Silva, E A James, B Maillère, M Dorner, R J Boyton, D M Altmann
Zika virus (ZIKV) Infection has several outcomes from asymptomatic exposure to rash, conjunctivitis, Guillain-Barré syndrome or congenital Zika syndrome. Analysis of ZIKV immunity is confounded by the fact that several related Flaviviruses infect humans, including Dengue virus 1-4, West Nile virus and Yellow Fever virus. HLA class II restricted T cell cross-reactivity between ZIKV and other Flaviviruses infection(s) or vaccination may contribute to protection or to enhanced immunopathology. We mapped immunodominant, HLA class II restricted, CD4 epitopes from ZIKV Envelope (Env), and Non-structural (NS) NS1, NS3 and NS5 antigens in HLA class II transgenic mice...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29324725/west-nile-virus-and-other-nationally-notifiable-arboviral-diseases-united-states-2016
#13
Alexis Burakoff, Jennifer Lehman, Marc Fischer, J Erin Staples, Nicole P Lindsey
Arthropod-borne viruses (arboviruses) are transmitted to humans primarily through the bites of infected mosquitoes and ticks. West Nile virus (WNV) is the leading cause of domestically acquired arboviral disease in the continental United States (1,2). Other arboviruses, including La Crosse, Powassan, Jamestown Canyon, St. Louis encephalitis, and eastern equine encephalitis viruses, cause sporadic cases of disease and occasional outbreaks. This report summarizes surveillance data reported to CDC for 2016 for nationally notifiable arboviruses...
January 12, 2018: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/29322519/inactivation-of-chikungunya-virus-in-blood-components-treated-with-amotosalen-ultraviolet-a-light-or-amustaline-glutathione
#14
Andrew Laughhunn, Yan-Jang S Huang, Dana L Vanlandingham, Marion C Lanteri, Adonis Stassinopoulos
BACKGROUND: Chikungunya virus, a mosquito-borne arbovirus, often co-circulates with the Zika, dengue, and yellow fever viruses in Aedes mosquito-infested areas where cases of arbovirus transfusion-transmitted infections have been reported. Building on past experience to help maintain the availability of safe components during major outbreaks of chikungunya virus in La Reunion, Italy, and Thailand and of Zika virus in the Pacific, the Caribbean, and the Americas, pathogen inactivation is a mitigation strategy to reduce the risk of transfusion-transmitted infection...
January 10, 2018: Transfusion
https://www.readbyqxmd.com/read/29322059/citrus-seed-oils-efficacy-against-larvae-of-aedes-aegypti
#15
Hazrat Bilal, Waseem Akram, Soaib Ali Hassan, Sadrud Din
Background: Dengue fever is a serious public health issue in Pakistan for many years. Globally plants have been reported to contain compounds with insecticidal properties. These properties have been demonstrated more recently on the larval stages of mosquitoes. Therefore, Citrus cultivar seeds were evaluated for larvicidal potential against the primary dengue vector Aedes aegypti. Methods: Extraction of oil was done by a steam distillation method and oils were evaluated according to WHO guidelines for larvicides 2005 for evaluation of insecticidal properties of citrus seed extracts against mosquito larvae...
September 2017: Journal of Arthropod-borne Diseases
https://www.readbyqxmd.com/read/29319426/dengue-hemorrhagic-fever-virus-in-saudi-arabia-a-review
#16
Jaffar A Al-Tawfiq, Ziad A Memish
Dengue fever is a global disease with a spectrum of clinical manifestation ranging from mild febrile disease to a severe disease in the form of dengue hemorrhagic fever and dengue shock syndrome. Dengue virus is one viral hemorrhagic fever that exists in the Kingdom of Saudi Arabia in addition to Alkhurma (Alkhurma) Hemorrhagic Fever, Chikungunya virus, Crimean-Congo Hemorrhagic Fever, and Rift Valley Fever. The disease is limited to the Western and South-western regions of Saudi Arabia, where Aedes aegypti exists...
January 10, 2018: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/29319265/acute-scrotal-edema-an-atypical-manifestation-of-dengue
#17
Meenaxi Sharda, Anil Soni, Harish Nigam, Anuraj Singh, Nitasha Sharma
Acute scrotal edema associated with dengue fever is a rare and self limiting condition resolving in a few days without any complication or sequelae. We report two cases of dengue fever in father and son which presented simultaneously with acute scrotal edema.
October 2017: Journal of the Association of Physicians of India
https://www.readbyqxmd.com/read/29317714/mechanism-and-structural-diversity-of-exoribonuclease-resistant-rna-structures-in-flaviviral-rnas
#18
Andrea MacFadden, Zoe O'Donoghue, Patricia A G C Silva, Erich G Chapman, René C Olsthoorn, Mark G Sterken, Gorben P Pijlman, Peter J Bredenbeek, Jeffrey S Kieft
Flaviviruses such as Yellow fever, Dengue, West Nile, and Zika generate disease-linked viral noncoding RNAs called subgenomic flavivirus RNAs. Subgenomic flavivirus RNAs result when the 5'-3' progression of cellular exoribonuclease Xrn1 is blocked by RNA elements called Xrn1-resistant RNAs located within the viral genome's 3'-untranslated region that operate without protein co-factors. Here, we show that Xrn1-resistant RNAs can halt diverse exoribonucleases, revealing a mechanism in which they act as general mechanical blocks that 'brace' against an enzyme's surface, presenting an unfolding problem that confounds further enzyme progression...
January 9, 2018: Nature Communications
https://www.readbyqxmd.com/read/29314584/qsar-analysis-of-plant-derived-compounds-with-larvicidal-activity-against-zika-aedes-aegypti-diptera-culicidae-vector-using-freely-available-descriptors
#19
Laura M Saavedra, Gustavo P Romanelli, Pablo R Duchowicz
BACKGROUND: We develop a QSAR model for predicting the larvicidal activity of 60 plant-derived molecules against Aedes aegypti L. (Diptera: Culicidae), vector of several diseases such as, dengue, yellow fever, chikungunya and Zika virus. The balanced subsets method (BSM) based on k-means cluster analysis (k-MCA) is employed to split the data set. The replacement method (RM) variable subset selection technique coupled with multivariable linear regression (MLR) proves to be successful for exploring 18,326 molecular descriptors and fingerprints calculated with PaDEL, Mold2 and EPI Suite open-source software...
January 4, 2018: Pest Management Science
https://www.readbyqxmd.com/read/29305089/how-do-virus-mosquito-interactions-lead-to-viral-emergence
#20
REVIEW
Claudia Rückert, Gregory D Ebel
Arboviruses such as West Nile, Zika, chikungunya, dengue, and yellow fever viruses have become highly significant global pathogens through unexpected, explosive outbreaks. While the rapid progression and frequency of recent arbovirus outbreaks is associated with long-term changes in human behavior (globalization, urbanization, climate change), there are direct mosquito-virus interactions which drive shifts in host range and alter virus transmission. This review summarizes how virus-mosquito interactions are critical for these viruses to become global pathogens at molecular, physiological, evolutionary, and epidemiological scales...
January 2, 2018: Trends in Parasitology
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