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https://www.readbyqxmd.com/read/29351663/mini-review-can-non-human-leucocyte-antigen-genes-determine-susceptibility-to-severe-dengue-syndromes
#1
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/29350414/ross-river-virus-in-australian-blood-donors-possible-implications-for-blood-transfusion-safety
#2
Helen M Faddy, Thu V Tran, Veronica C Hoad, Clive R Seed, Elvina Viennet, Hiu-Tat Chan, Robert Harley, Elise Hewlett, Roy A Hall, Helle Bielefeldt-Ohmann, Robert L P Flower, Natalie A Prow
BACKGROUND: Emerging transfusion-transmissible pathogens, including arboviruses such as West Nile, Zika, dengue, and Ross River viruses, are potential threats to transfusion safety. The most prevalent arbovirus in humans in Australia is Ross River virus (RRV); however, prevalence varies substantially around the country. Modeling estimated a yearly risk of 8 to 11 potentially RRV-viremic fresh blood components nationwide. This study aimed to measure the occurrence of RRV viremia among donors who donated at Australian collection centers located in areas with significant RRV transmission during one peak season...
January 19, 2018: Transfusion
https://www.readbyqxmd.com/read/29350156/dengue-associated-posterior-reversible-encephalopathy-syndrome-vietnam
#3
Nguyen Thi Hoang Mai, Nguyen Hoan Phu, Ho Dang Trung Nghia, Tran My Phuong, Du Trong Duc, Nguyen Van Vinh Chau, Bridget Wills, Choie Cheio Tchoyoson Lim, Guy Thwaites, Cameron Paul Simmons, Sophie Yacoub
Dengue can cause neurologic complications in addition to the more common manifestations of plasma leakage and coagulopathy. Posterior reversible encephalopathy syndrome has rarely been described in dengue, although the pathophysiology of endothelial dysfunction likely underlies both. We describe a case of dengue-associated posterior reversible encephalopathy syndrome and discuss diagnosis and management.
February 2018: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/29346287/development-of-zika-virus-vaccines
#4
REVIEW
Huda Makhluf, Sujan Shresta
Zika virus (ZIKV) is a mosquito-borne flavivirus that emerged as a global threat following the most recent outbreak in Brazil in 2015. ZIKV infection of pregnant women is associated with fetal abnormalities such as microcephaly, and infection of adults can lead to Guillain-Barré syndrome, an autoimmune disease characterized by neurological deficits. Although there are currently licensed vaccines for other flaviviruses, there remains an urgent need for preventative vaccines against ZIKV infection. Herein we describe the current efforts to accelerate the development of ZIKV vaccines using various platforms, including live attenuated virus, inactivated virus, DNA and RNA, viral vectors, and in silico-predicted immunogenic viral epitopes...
January 18, 2018: Vaccines
https://www.readbyqxmd.com/read/29346061/two-cases-of-dengue-fever-imported-from-egypt-to-russia-2017
#5
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
#6
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
#7
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/29344662/dengue-virus-1-ns5-genetic-variant-associated-with-a-severe-clinical-infection-possible-reduction-of-the-innate-immune-response-by-inhibition-of-interferon-type-1-and-the-janus-kinase-signal-transducer-and-activator-of-transcription-signaling-pathway
#8
Iván Delgado-Enciso, Uriel A López-Lemus, Jose A Valcarcel-Gamiño, Iram P Rodriguez-Sanchez, Salvador Valle-Reyes, Margarita L Martinez-Fierro, Valery Melnikov, José Guzmán-Esquivel, Felipe Vaca-Paniagua, Laura L Valdez-Velazquez, Luz M Baltazar-Rodriguez, Alejandro D Soriano-Hernandez, Brenda Paz-Michel, Francisco Espinoza-Gómez
Dengue virus (DENV) is currently considered as one of the most important mosquito-borne viral pathogens affecting humans. Genetic variations in viruses are likely to be a condition for more effective evasion of the immune system and resulting in severe clinical consequences. The DENV‑1 NS5 gene was sequenced to establish whether during an epidemic burst there were genetic variations of the virus and whether any variant was associated (through a case‑control design) with severe clinical behavior. A total of 31 patients positive for DENV‑1 were enrolled...
January 17, 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29343583/structural-study-of-the-c-terminal-domain-of-non-structural-protein-1-from-japanese-encephalitis-virus
#9
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/29343225/health-worker-knowledge-of-integrated-disease-surveillance-and-response-standard-case-definitions-a-cross-sectional-survey-at-rural-health-facilities-in-kenya
#10
Mitsuru Toda, Dejan Zurovac, Ian Njeru, David Kareko, Matilu Mwau, Kouichi Morita
BACKGROUND: The correct knowledge of standard case definition is necessary for frontline health workers to diagnose suspected diseases across Africa. However, surveillance evaluations commonly assume this prerequisite. This study assessed the knowledge of case definitions for health workers and their supervisors for disease surveillance activities in rural Kenya. METHODS: A cross-sectional survey including 131 health workers and their 11 supervisors was undertaken in two counties in Kenya...
January 17, 2018: BMC Public Health
https://www.readbyqxmd.com/read/29339224/emerging-souvenirs-clinical-presentation-of-the-returning-traveller-with-imported-arbovirus-infections-in-europe
#11
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
#12
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/29338712/association-between-the-level-of-education-and-knowledge-attitudes-and-practices-regarding-dengue-in-the-caribbean-region-of-colombia
#13
Fredi Alexander Diaz-Quijano, Ruth Aralí Martínez-Vega, Alfonso J Rodriguez-Morales, Ronald Alexander Rojas-Calero, María Lucrecia Luna-González, Ronald Giovanny Díaz-Quijano
BACKGROUND: Community integration in dengue control requires assessments of knowledge, attitudes and practices (KAPs), which can vary widely according to demographic and educational factors. We aimed to describe and compare the KAPs according to level of education in municipalities in the Caribbean region of Colombia. METHODS: A survey was administered from October to December 2015, including families selected through probabilistic sampling in eleven municipalities...
January 16, 2018: BMC Public Health
https://www.readbyqxmd.com/read/29338543/lucidone-suppresses-dengue-viral-replication-through-the-induction-of-heme-oxygenase-1
#14
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/29335200/discovery-and-optimization-of-phthalazinone-derivatives-as-a-new-class-of-potent-dengue-virus-inhibitors
#15
Dong Lu, Jianan Liu, Yunzhe Zhang, Feifei Liu, Limin Zeng, Runze Peng, Li Yang, Huazhou Ying, Wei Tang, Wuhong Chen, Jianping Zuo, Xiankun Tong, Tao Liu, Youhong Hu
Using a dengue replicon cell line-based screening, we identified 3-(dimethylamino)propyl(3-((4-(4-fluorophenyl)-1-oxophthalazin-2(1H)-yl)methyl)phenyl)carbamate (10a) as a potent DENV-2 inhibitor, with an IC50 value of 0.64 μM. A series of novel phthalazinone derivatives based on hit 10a were synthesized and evaluated for their in vitro anti-DENV activity and cytotoxicity. The subsequent SAR study and optimization led to the discovery of the most promising compound 14l, which displayed potent anti-DENV-2 activity, with low IC50 value against DENV-2 RNA replication of 0...
January 5, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29335021/seroprevalence-of-dengue-among-healthy-adults-in-a-rural-community-in-southern-malaysia-a-pilot-study
#16
Amreeta Dhanoa, Sharifah Syed Hassan, Nowrozy Kamar Jahan, Daniel D Reidpath, Quek Kia Fatt, Mohtar Pungut Ahmad, Cheong Yuet Meng, Lau Wee Ming, Anuar Zaini Zain, Maude Elvira Phipps, Iekhsan Othman, Aman Bin Rabu, Rowther Sirajudeen, Ahmad Abdul Basitz Ahmad Fatan, Faidzal Adlee Ghafar, Hamdan Bin Ahmad, Pascale Allotey
BACKGROUND: The frequency and magnitude of dengue epidemics continue to increase exponentially in Malaysia, with a shift in the age range predominance toward adults and an expansion to rural areas. Despite this, information pertaining to the extent of transmission of dengue virus (DENV) in the rural community is lacking. This community-based pilot study was conducted to establish DENV seroprevalence amongst healthy adults in a rural district in Southern Malaysia, and to identify influencing factors...
January 16, 2018: Infectious Diseases of Poverty
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
#17
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
#18
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/29331246/estimation-of-expected-dengue-seroprevalence-from-passive-epidemiological-surveillance-systems-in-selected-areas-of-argentina-a-proxy-to-evaluate-the-applicability-of-dengue-vaccination
#19
Pablo Orellano, Darío Vezzani, Nancy Quaranta, Julieta Reynoso, Oscar Daniel Salomón
BACKGROUND: Current recommendations about dengue vaccination by the World Health Organization depend on seroprevalence levels and serological status in populations and individuals. However, seroprevalence estimation may be difficult due to a diversity of factors. Thus, estimation through models using data from epidemiological surveillance systems could be an alternative procedure to achieve this goal. OBJECTIVE: To estimate the expected dengue seroprevalence in children of selected areas in Argentina, using a simple model based on data from passive epidemiological surveillance systems...
January 11, 2018: Vaccine
https://www.readbyqxmd.com/read/29331008/atypical-presentation-of-rickettsial-spotted-fever
#20
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
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