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Dengue virus

Baoyin Yuan, Hiroshi Nishiura
BACKGROUND: Frequent international travel facilitates the global spread of dengue fever. Japan has experienced an increasing number of imported case notifications of dengue virus (DENV) infection, mostly arising from Japanese travelers visiting South and Southeast Asian countries. This has led an autochthonous dengue outbreak in 2014 in Japan. The present study aimed to infer the risk of DENV infection among Japanese travelers to Asian countries, thereby obtaining an actual estimate of the number of DENV infections among travelers...
2018: PloS One
J L Slon Campos, M Poggianella, O R Burrone
Dengue virus (DENV) is one the most important viral pathogens worldwide. Currently there is an imperative need for a reliable vaccine capable of inducing durable protection against all four serotypes. We have previously reported strongly neutralizing and highly specific antibody responses from all four serotypes to a DNA vaccine based on an engineered version of DENV E protein's domain III (DIII). Here, we show that monovalent and tetravalent immunizations with the DIII-based DNA vaccines are also capable of inducing highly stable antibody responses that remain strongly neutralizing over long periods of time...
June 20, 2018: Journal of General Virology
Jyoti S Kumar, Divyasha Saxena, Manmohan Parida, Sivakumar Rathinam
Background & objectives: West Nile virus (WNV) is a mosquito-borne flavivirus. The disease can be diagnosed by isolation followed by fluorescent antibody tests, enzyme-linked immunosorbent assay and polymerase chain reaction (PCR) assay. These diagnostic methods are laborious and time-consuming. The present study was aimed to evaluate the real-time reverse-transcription loop-mediated isothermal amplification (RT-LAMP) method for rapid, early and accurate diagnosis of WNV. Methods: A one-step single tube accelerated quantitative RT-LAMP assay was evaluated by targeting the Env gene of WNV...
March 2018: Indian Journal of Medical Research
Irma Y Amaya-Larios, Mario Rojas-Russell, Malaquias López-Cervantes, Lilia Castro-Porras, Ma Victoria Castro-Borbonio, Elsa Sarti, Esteban Puentes-Rosas, Laura L Tirado-Gómez, Gustavo Olaíz-Fernandez, José Ramos-Castañeda
Background: Dengue is the most important arboviral disease in the world. Seroprevalence has been proposed as a marker of endemicity, however, studies are scarce. Methods: We conducted a cross-sectional, stratified cluster, random sample study to measure the seroprevalence of antibodies to dengue virus (DENV) in Mexico. The target population was school children ages 6-17 y from 22 endemic states in Mexico, clustered in four regions: Pacific, South-Central, Southeast and Low...
June 16, 2018: Transactions of the Royal Society of Tropical Medicine and Hygiene
Kirk Haltaufderhyde, Anon Srikiatkhachorn, Sharone Green, Louis Macareo, Sangshin Park, Siripen Kalayanarooj, Alan L Rothman, Anuja Mathew
Follicular helper T cells (TFH) are specialized CD4 T cells required for B-cell help and antibody production. Given the postulated role of immune activation in dengue disease, we measured the expansion and activation of TFH in the circulation (pTFH) collected from Thai children with laboratory-confirmed acute DENV infection. We found significant expansion and activation of pTFH subsets during acute infection with the highest frequencies of activated pTFH (PD1hi pTFH and PD1+CD38+ pTFH) detected during the critical phase of illness...
June 15, 2018: Journal of Infectious Diseases
Thuy Thu Bui, Meng Ling Moi, Takeshi Nabeshima, Taichiro Takemura, Trang Thu Nguyen, Linh Ngoc Nguyen, Hang Thi Thu Pham, Thi Thu Thuy Nguyen, Dao Huy Manh, Shyam Prakash Dumre, Shusaku Mizukami, Kenji Hirayama, Shigeru Tajima, Mai Thi Quynh Le, Kiyoshi Aoyagi, Futoshi Hasebe, Kouichi Morita
Dengue virus (DENV) replication between mosquito and human hosts is hypothesized to be associated with viral determinants that interact in a differential manner between hosts. However, the understanding of inter-host viral determinants that drive DENV replication and growth between hosts is limited. Through the use of clinical isolates, we identified an amino acid variation of Ala, Met and Val at position 116 of DENV-1 NS4B. While the proportion of virus with the NS4B-116V variant remained constantly high in serial passages in a mosquito cell line, populations of the NS4B-116M and NS4B-116A variants became dominant after serial passages in mammalian cell lines...
June 19, 2018: Journal of General Virology
S N Surendran, T Veluppillai, T Eswaramohan, K Sivabalakrishnan, F Noordeen, R Ramasamy
Background & objectives: Aedes aegypti and Ae. albopictus are major arboviral vectors that are considered to lay eggs, and undergo preimaginal development only in fresh water collections. However, recently they have been also shown to develop in coastal brackish water habitats. The ability of the biologically variant salinity-tolerant Aedes vectors to transmit arboviral diseases is unknown. We therefore, investigated the infection of salinity-tolerant Aedes mosquitoes with dengue virus (DENV) and analysed dengue incidence and rainfall data to assess the contribution of salinity-tolerant Aedes vectors to dengue transmission in the coastal Jaffna peninsula in Sri Lanka...
January 2018: Journal of Vector Borne Diseases
Qiang Ding, Jenna M Gaska, Florian Douam, Lei Wei, David Kim, Metodi Balev, Brigitte Heller, Alexander Ploss
The limited host tropism of numerous viruses causing disease in humans remains incompletely understood. One example is Zika virus (ZIKV), an RNA virus that has reemerged in recent years. Here, we demonstrate that ZIKV efficiently infects fibroblasts from humans, great apes, New and Old World monkeys, but not rodents. ZIKV infection in human-but not murine-cells impairs responses to agonists of the cGMP-AMP synthase/stimulator of IFN genes (cGAS/STING) signaling pathway, suggesting that viral mechanisms to evade antiviral defenses are less effective in rodent cells...
June 18, 2018: Proceedings of the National Academy of Sciences of the United States of America
Julien Muffat, Yun Li, Attya Omer, Ann Durbin, Irene Bosch, Grisilda Bakiasi, Edward Richards, Aaron Meyer, Lee Gehrke, Rudolf Jaenisch
Maternal Zika virus (ZIKV) infection during pregnancy is recognized as the cause of an epidemic of microcephaly and other neurological anomalies in human fetuses. It remains unclear how ZIKV accesses the highly vulnerable population of neural progenitors of the fetal central nervous system (CNS), and which cell types of the CNS may be viral reservoirs. In contrast, the related dengue virus (DENV) does not elicit teratogenicity. To model viral interaction with cells of the fetal CNS in vitro, we investigated the tropism of ZIKV and DENV for different induced pluripotent stem cell-derived human cells, with a particular focus on microglia-like cells...
June 18, 2018: Proceedings of the National Academy of Sciences of the United States of America
Brian Webster, Scott W Werneke, Biljana Zafirova, Sébastien This, Séverin Coléon, Elodie Décembre, Helena Paidassi, Isabelle Bouvier, Pierre-Emmanuel Joubert, Darragh Duffy, Thierry Walzer, Matthew L Albert, Marlène Dreux
Type I interferon (IFN-I) responses are critical for the control of RNA virus infections, however, many viruses, including Dengue (DENV) and Chikungunya (CHIKV) virus, do not directly activate plasmacytoid dendritic cells (pDCs), robust IFN-I producing cells. Herein, we demonstrated that DENV and CHIKV infected cells are sensed by pDCs, indirectly, resulting in selective IRF7 activation and IFN-I production, in the absence of other inflammatory cytokine responses. To elucidate pDC immunomodulatory functions, we developed a mouse model in which IRF7 signaling is restricted to pDC...
June 19, 2018: ELife
Stephanie Margarete Thomas, Nils Benjamin Tjaden, Christina Frank, Anja Jaeschke, Lukas Zipfel, Christiane Wagner-Wiening, Mirko Faber, Carl Beierkuhnlein, Klaus Stark
The intensity and extent of transmission of arboviruses such as dengue, chikungunya, and Zika virus have increased markedly over the last decades. Autochthonous transmission of dengue and chikungunya by Aedes albopictus has been recorded in Southern Europe where the invasive mosquito was already established and viraemic travelers had imported the virus. Ae. albopictus populations are spreading northward into Germany. Here, we model the current and future climatically suitable regions for Ae. albopictus establishment in Germany, using climate data of spatially high resolution...
June 15, 2018: International Journal of Environmental Research and Public Health
Wen-Yang Tsai, Han Ha Youn, Jasmine Tyson, Carlos Brites, Jih-Jin Tsai, Celia Pedroso, Jan Felix Drexler, Angel Balmaseda, Eva Harris, Wei-Kung Wang
Serologic testing remains crucial for Zika virus diagnosis. We found that urea wash in a Zika virus nonstructural protein 1 IgG ELISA distinguishes secondary dengue virus infection from Zika virus infection with previous dengue (sensitivity 87.5%, specificity 93.8%). This test will aid serodiagnosis, serosurveillance, and monitoring of Zika complications in dengue-endemic regions.
July 2018: Emerging Infectious Diseases
Sergio Alejandro Gómez-Ochoa
BACKGROUND: Plasma viremia is a factor whose role in the severity of dengue virus infection has been widely discussed in recent years, with divergent results found in the multiple contexts evaluated. METHODS: A systematic review of the literature using the Scopus, EBSCOhost, SpringerLink, Lilacs and Scielo databases was conducted. For inclusion in the review there were considered studies that evaluated the relationship between plasma viral load and clinical manifestations or severity of the disease...
April 2018: Revista Chilena de Infectología: órgano Oficial de la Sociedad Chilena de Infectología
Guilherme Amaral Calvet, Patricia Brasil, Andre Machado Siqueira, Heruza Einsfeld Zogbi, Bianca de Santis Gonçalves, Aline da Silva Santos, Otilia Lupi, Rogerio Valls de Souza, Cintia Damasceno Dos Santos Rodrigues, Clarisse da Silveira Bressan, Mauymi Duarte Wakimoto, Eliane Saraiva de Araújo, Ingrid Cardoso Dos Santos, Ingebourg Georg, Rita Maria Ribeiro Nogueira, Valdilea Gonçalves Veloso, Ana Maria Bispo de Filippis
BackgroundZika virus (ZIKV) emergence in South America revealed the lack of knowledge regarding clinical manifestations in HIV-infected individuals. OBJECTIVES: We described the clinical characteristics, laboratory manifestations, differential diagnosis, and outcome of ZIKV infection in a large, single-center cohort of HIV-infected patients.MethodsHIV-infected patients aged ≥ 18 years with clinical suspected arboviral disease from an ongoing cohort were followed from February through December 2015...
June 14, 2018: Journal of Acquired Immune Deficiency Syndromes: JAIDS
Kalamathy Murugananthan, Pethirupillai A D Coonghe, Natkunam Ketheesan, Faseeha Noordeen
A total of 765 blood samples collected from dengue suspected patients admitted to a Teaching Hospital in Sri Lanka were used to compare a rapid ICT assay with a standard ELISA for the detection of anti-dengue virus (DENV) IgM and IgG. Detection accuracy indices including sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), Chi square and Cohen's kappa values were determined for the ICT assay using the ELISA as a comparator for the detection of anti-DENV IgM and IgG. The rapid ICT assay showed a sensitivity of 64%, specificity of 75%, NPV of 68% and PPV of 72% for anti-DENV IgM detection...
June 2018: Virusdisease
Waqar Hussain, Iqra Qaddir, Sajid Mahmood, Nouman Rasool
Dengue fever is one of the most prevalent disease in tropical and sub-tropical regions of the world. According to the World Health Organisation (WHO), approximately 3.5 billion people have been affected with dengue fever. Four serotypes of dengue virus (DENV) i.e. DENV1, DENV2, DENV3 and DENV4 have up to 65% genetic variations among themselves. dengue virus 4 (DENV4) was first reported from Amazonas, Brazil and is spreading perilously due to lack of awareness of preventive measures, as it is the least targeted serotype...
June 2018: Virusdisease
Birendra Prasad Gupta, Mahesh Lamsal, Sudhikshya Chaulagain, Ramanuj Rauniyar, Rajani Malla, Smita Shrestha, Roshan Kurmi, Krishna Das Manandhar
Dengue virus is a major health problem in Nepal. The endogenous dengue appeared in 2006 in the country with reported outbreaks in 2010, 2013 and 2016. Eleven years vertical data show there were sporadic cases in all the years and mostly adults between 25 and 40 years of age were infected with dengue virus. Compared with primary infections, secondary infections were observed in relatively larger numbers during the period of 2008-2016. Most of the cases had symptoms of dengue fever; while 7 and 19 cases demonstrated dengue hemorrhagic fever/dengue shock syndrome in 2010 and 2013 respectively...
June 2018: Virusdisease
Gaurav Baheti, Varshil Mehta, Menka Ramchandani, Gopal Chandra Ghosh
The clinical profile and presentation of patients with dengue fever may differ from asymptomatic infection to the dreadful complications like dengue shock syndrome. However, neurological complications are very rare. Dengue encephalitis occurs by a direct involvement of central nervous system by the dengue virus which is an extremely rare complication. A 33-year-old man presented with fever, vomiting and severe headache. He had one episode of generalised tonic-clonic seizure followed by an altered sensorium on the day of admission to the hospital...
June 15, 2018: BMJ Case Reports
Yan Chao Cui, Qiong Wu, Seoh Wei Teh, Amira Peli, Gang Bu, Yu Sheng Qiu, Giovanni Benelli, S Suresh Kumar
The recent global resurgence of arthritogenic alphaviruses, including Ross River, chikungunya, and dengue, highlights an urgency for the development of therapeutic strategies. Currently, dengue represents the most rapidly transmitting mosquito-borne viral disease worldwide. By contracting bone breaking diseases, patients experience devastating clinical manifestations involving muscle pain and bone loss. The bone self-repair and regeneration mechanisms can be damaged by the presence of viruses and bacteria. The rapid establishment of dengue epidemic and the severity of bacterial and viral infections affecting the bone stress the urgent need of developing effective interventions...
June 14, 2018: Microbial Pathogenesis
Glenn Randall
Dengue virus (DENV) induces a proviral selective autophagy targeting lipid droplets, termed lipophagy, that stimulates lipid metabolism. Zhang et al. gained mechanistic insight into this process, demonstrating that DENV NS4A/B binds unmodified AUP1 and promotes its translocation from lipid droplets to autophagosomes to drive the induction of lipophagy.
May 29, 2018: Trends in Microbiology
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