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https://www.readbyqxmd.com/read/28928210/analysis-of-individuals-from-a-dengue-endemic-region-helps-define-the-footprint-and-repertoire-of-antibodies-targeting-dengue-virus-3-type-specific-epitopes
#1
Daniela V Andrade, Leah C Katzelnick, Doug G Widman, Angel Balmaseda, Aravinda M de Silva, Ralph S Baric, Eva Harris
The four dengue virus serotypes (DENV1 to 4) cause dengue, a major public health problem worldwide. Individuals exposed to primary DENV infections develop serotype-specific neutralizing antibodies, including strongly neutralizing antibodies targeting quaternary epitopes. To date, no studies have measured the levels and kinetics of serum antibodies directed to such epitopes among populations in regions where dengue is endemic. Here, we use a recombinant DENV4 (rDENV4/3-M14) displaying a major DENV3 type-specific quaternary epitope recognized by human monoclonal antibody 5J7 to measure the proportion, magnitude, and kinetics of DENV3 type-specific neutralizing antibody responses targeting this epitope...
September 19, 2017: MBio
https://www.readbyqxmd.com/read/28878078/potent-plasmablast-derived-antibodies-elicited-by-the-nih-dengue-vaccine
#2
Diogo M Magnani, Cassia G T Silveira, Michael J Ricciardi, Lucas Gonzalez-Nieto, Núria Pedreño-Lopez, Varian K Bailey, Martin J Gutman, Helen S Maxwell, Aline Domingues, Priscilla R Costa, Lilian Ferrari, Raphaella Goulart, Mauricio A Martins, José M Martinez-Navio, Sebastian P Fuchs, Jorge Kalil, Maria do Carmo Timenetsky, Jens Wrammert, Stephen S Whitehead, Dennis R Burton, Ronald C Desrosiers, Esper G Kallas, David I Waktins
Exposure to dengue virus (DENV) is thought to elicit lifelong immunity, mediated by DENV-neutralizing antibodies (nAbs). However, Abs generated by primary infections confer serotype-specific protection, and immunity against other serotypes only develops after subsequent infections. Accordingly, the induction of these nAb responses acquired after serial DENV infections has been a long sought-after goal for vaccination. Nonetheless, it is still unclear if tetravalent vaccines can elicit or recall nAbs. Here, we have characterized the responses from a volunteer who had been previously exposed to DENV and was immunized with the live attenuated tetravalent vaccine Butantan-DV, developed by the NIH and Butantan...
September 6, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28873408/-we-need-people-to-collaborate-together-against-this-disease-a-qualitative-exploration-of-perceptions-of-dengue-fever-control-in-caregivers-of-children-under-5-years-in-the-peruvian-amazon
#3
Amy L Frank, Emily R Beales, Gilles de Wildt, Graciela Meza Sanchez, Laura L Jones
BACKGROUND: Dengue Fever presents a significant and growing burden of disease to endemic countries, where children are at particular risk. Worldwide, no effective anti-viral treatment has been identified, thus vector control is key for disease prevention, particularly in Peru where no vaccine is currently available. This qualitative study aimed to explore the perceptions of dengue control in caregivers' of children under 5 years in Peru, to help direct future mosquito control programmes and strategy...
September 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28852982/toxicological-effects-of-chemical-constituents-from-piper-against-the-environmental-burden-aedes-aegypti-liston-and-their-impact-on-non-target-toxicity-evaluation-against-biomonitoring-aquatic-insects
#4
Prabhakaran Vasantha-Srinivasan, Annamalai Thanigaivel, Edward-Sam Edwin, Athirstam Ponsankar, Sengottayan Senthil-Nathan, Selvaraj Selin-Rani, Kandaswamy Kalaivani, Wayne B Hunter, Veeramuthu Duraipandiyan, Naif Abdullah Al-Dhabi
Dengue is the most rapidly spreading mosquito-borne viral disease in the world. The mosquito, Aedes aegypti, also spreads Yellow fever, Chikungunya, and Zika virus. As the primary vector for dengue, Ae. aegypti now occurs in over 20 countries and is a serious concern with reports of increasing insecticide resistance. Developing new treatments to manage mosquitoes are needed. Formulation of crude volatile oil from Piper betle leaves (Pb-CVO) was evaluated as a potential treatment which showed larvicidal, ovipositional, and repellency effects...
August 29, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28845800/symptomatic-dengue-infection-during-pregnancy-and-the-risk-of-stillbirth-in-brazil-2006-12-a-matched-case-control-study
#5
Enny S Paixão, Maria da Conceição N Costa, Maria Glória Teixeira, Katie Harron, Marcia Furquim de Almeida, Mauricio L Barreto, Laura C Rodrigues
BACKGROUND: Maternal infections during pregnancy can increase the risk of fetal death. Dengue infection is common, but little is known about its role in fetal mortality. We aimed to investigate the association between symptomatic dengue infection during pregnancy and fetal death. METHODS: We did a nested case-control study using obstetrician-collected data from the Brazilian livebirth information system (SINASC), the mortality information system (SIM), and the national reportable disease information system (SINAN)...
September 2017: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/28814934/direct-medical-costs-of-dengue-fever-in-vietnam-a-retrospective-study-in-a-tertiary-hospital
#6
Nhung Thi Tuyet Vo, Trang Ngo Diem Phan, Trung Quang Vo
BACKGROUND: In Vietnam, dengue fever is a major health concern, yet comprehensive information on its economic costs is lacking. The present study investigated treatment costs associated with dengue fever from the perspective of health care provision. METHODS: This retrospective study was conducted between January 2013 and December 2015 in Cu Chi General Hospital. The following dengue-related treatment costs were calculated: hospitalisation, diagnosis, specialised services, drug usage and medical supplies...
May 2017: Malaysian Journal of Medical Sciences: MJMS
https://www.readbyqxmd.com/read/28806786/an-economic-evaluation-of-vector-control-in-the-age-of-a-dengue-vaccine
#7
Christopher Fitzpatrick, Alexander Haines, Mathieu Bangert, Andrew Farlow, Janet Hemingway, Raman Velayudhan
INTRODUCTION: Dengue is a rapidly emerging vector-borne Neglected Tropical Disease, with a 30-fold increase in the number of cases reported since 1960. The economic cost of the illness is measured in the billions of dollars annually. Environmental change and unplanned urbanization are conspiring to raise the health and economic cost even further beyond the reach of health systems and households. The health-sector response has depended in large part on control of the Aedes aegypti and Ae...
August 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28790459/dengue-burden-in-india-recent-trends-and-importance-of-climatic-parameters
#8
Srinivasa Rao Mutheneni, Andrew P Morse, Cyril Caminade, Suryanaryana Murty Upadhyayula
For the past ten years, the number of dengue cases has gradually increased in India. Dengue is driven by complex interactions among host, vector and virus that are influenced by climatic factors. In the present study, we focused on the extrinsic incubation period (EIP) and its variability in different climatic zones of India. The EIP was calculated by using daily and monthly mean temperatures for the states of Punjab, Haryana, Gujarat, Rajasthan and Kerala. Among the studied states, a faster/low EIP in Kerala (8-15 days at 30...
August 9, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/28764157/seroepidemiology-of-spotted-fever-rickettsiosis-in-uttar-pradesh-a-prospective-study
#9
Chandra Dev Pati Tripathi, Mastan Singh, Jyotsna Agarwal, Chandra Kanta, Virendra Atam
INTRODUCTION: Spotted Fever Rickettsiosis (SFR), an acute febrile illness caused by Rickettsia rickettsii, R. conorii and R. akari which is associated with considerable morbidity and mortality. SFR is one of the most covert emerging infections of the present time which is prevalent in various parts of India as shown by the increase in the number of clinically diagnosed patients in various states except Uttar Pradesh. AIM: To diagnose SFR in clinically suspected patients using serological tests and recognition of common epidemiologic situations and clinical manifestations of SFR in the state of Uttar Pradesh...
June 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28763150/pneumonia-in-the-tropics
#10
REVIEW
Tow Keang Lim, Wen Ting Siow
Pneumonia in the tropics poses a heavy disease burden. The complex interplay of climate change, human migration influences and socio-economic factors lead to changing patterns of respiratory infections in tropical climate but also increasingly in temperate countries. Tropical and poorer countries, especially South East Asia, also bear the brunt of the global tuberculosis (TB) pandemic, accounting for almost one-third of the burden. But, as human migration patterns evolve, we expect to see more TB cases in higher income as well as temperate countries, and rise in infections like scrub typhus from ecotourism activities...
August 1, 2017: Respirology: Official Journal of the Asian Pacific Society of Respirology
https://www.readbyqxmd.com/read/28763070/-knowledge-of-vector-borne-diseases-dengue-rickettsiosis-and-chagas-disease-in-physicians
#11
César I Lugo-Caballero, Karla Dzul-Rosado, Irving Dzul-Tut, Ángel Balam-May, Jorge Zavala-Castro
BACKGROUND: The ecological conditions of Yucatan made it a suitable region for the acquisition of vector-borne diseases such as dengue, rickettsiosis, and Chagas disease. As the epidemiological burden of these diseases shows an alarming increase of severe cases, the early establishment of diagnosis and therapeutics by first-contact physicians is a critical step that is not being fulfilled due to several reasons, including poor knowledge. OBJECTIVE: To determine the level of knowledge related to dengue, Chagas disease, and rickettsiosis among rural first-contact physicians of Yucatan...
May 2017: Gaceta Médica de México
https://www.readbyqxmd.com/read/28757293/economic-cost-and-burden-of-dengue-during-epidemics-and-non-epidemic-years-in-taiwan
#12
Dih-Ling Luh, Cheng-Chieh Liu, Yun-Ru Luo, Szu-Chieh Chen
BACKGROUND: Determining the disease and economic burden of dengue is critical for the allocation of public health resources. Several studies have used disability-adjusted life-years (DALYs) to estimate the disease burden of dengue in different regions. However, there are no published studies discussing the estimates of dengue-related economic and disease burden specifically in Taiwan. OBJECTIVES: We assessed the economic cost and disease burden of dengue infections in Taiwan for the period 1998-2014, and compared these during epidemic and non-epidemic years...
July 27, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28754189/progress-and-works-in-progress-update-on-flavivirus-vaccine-development
#13
REVIEW
Matthew H Collins, Stefan W Metz
Most areas of the globe are endemic for at least one flavivirus, putting billions at risk for infection. This diverse group of viral pathogens causes a range of manifestations in humans from asymptomatic infection to hemorrhagic fever to encephalitis to birth defects and even death. Many flaviviruses are transmitted by mosquitos and have expanded in geographic distribution in recent years, with dengue virus being the most prevalent, infecting approximately 400 million people each year. The explosive emergence of Zika virus in Latin America in 2014 refocused international attention on this medically important group of viruses...
July 25, 2017: Clinical Therapeutics
https://www.readbyqxmd.com/read/28748176/global-epidemiology-of-dengue-outbreaks-in-1990-2015-a-systematic-review-and-meta-analysis
#14
Congcong Guo, Zixing Zhou, Zihao Wen, Yumei Liu, Chengli Zeng, Di Xiao, Meiling Ou, Yajing Han, Shiqi Huang, Dandan Liu, Xiaohong Ye, Xiaoqian Zou, Jing Wu, Huanyu Wang, Eddy Y Zeng, Chunxia Jing, Guang Yang
Dengue is an arthropod-borne infectious disease caused by dengue virus (DENV) infection and transmitted by Aedes mosquitoes. Approximately 50-100 million people are infected with DENV each year, resulting in a high economic burden on both governments and individuals. Here, we conducted a systematic review and meta-analysis to summarize information regarding the epidemiology, clinical characteristics, and serotype distribution and risk factors for global dengue outbreaks occurring from 1990 to 2015. We searched the PubMed, Embase and Web of Science databases through December 2016 using the term "dengue outbreak...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28730853/dengue-in-the-elderly-a-review
#15
Ray Junhao Lin, Tau Hong Lee, Yee Sin Leo
Changing dengue epidemiological trends have resulted in a shift in the disease burden to the adult population. Older adults suffer from poorer outcomes as compared to their younger counterparts, making clinical management of this sub-population particularly challenging. Areas covered: We present a review of the current literature on the changing epidemiology of dengue in the elderly, the atypical features of the clinical disease in this population with emphasis on severe disease presentations and challenges in the current management strategies...
August 2017: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/28727779/contemporary-status-of-insecticide-resistance-in-the-major-aedes-vectors-of-arboviruses-infecting-humans
#16
REVIEW
Catherine L Moyes, John Vontas, Ademir J Martins, Lee Ching Ng, Sin Ying Koou, Isabelle Dusfour, Kamaraju Raghavendra, João Pinto, Vincent Corbel, Jean-Philippe David, David Weetman
Both Aedes aegytpi and Ae. albopictus are major vectors of 5 important arboviruses (namely chikungunya virus, dengue virus, Rift Valley fever virus, yellow fever virus, and Zika virus), making these mosquitoes an important factor in the worldwide burden of infectious disease. Vector control using insecticides coupled with larval source reduction is critical to control the transmission of these viruses to humans but is threatened by the emergence of insecticide resistance. Here, we review the available evidence for the geographical distribution of insecticide resistance in these 2 major vectors worldwide and map the data collated for the 4 main classes of neurotoxic insecticide (carbamates, organochlorines, organophosphates, and pyrethroids)...
July 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28726595/co-circulation-and-co-infections-of-all-dengue-virus-serotypes-in-hyderabad-india-2014
#17
K Vaddadi, C Gandikota, P K Jain, V S V Prasad, M Venkataramana
The burden of dengue virus infections increased globally during recent years. Though India is considered as dengue hyper-endemic country, limited data are available on disease epidemiology. The present study includes molecular characterization of dengue virus strains occurred in Hyderabad, India, during the year 2014. A total of 120 febrile cases were recruited for this study, which includes only children and 41 were serologically confirmed for dengue positive infections using non-structural (NS1) and/or IgG/IgM ELISA tests...
September 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28721101/survey-of-malaria-and-anti-dengue-virus-igg-among-febrile-hiv-infected-patients-attending-a-tertiary-hospital-in-abuja-nigeria
#18
Jelili Olaide Mustapha, Anthony Uchenna Emeribe, Idris Abdullahi Nasir
BACKGROUND: Dengue and malaria are infections, of great public health concern, especially in sub-Saharan Africa where the burden of HIV infection is high. This study was conducted to determine the seroprevalence of dengue virus IgG antibodies and dengue/malaria coinfection among febrile HIV-infected patients attending the University of Abuja Teaching Hospital, Gwagwalada, Abuja. METHODS: In this cross-sectional study, blood samples from 178 consenting HIV-infected patients receiving antiretroviral therapy were collected and tested for plasmodiasis and anti-Dengue virus IgG using malaria microscopy and ELISA, respectively...
2017: HIV/AIDS: Research and Palliative Care
https://www.readbyqxmd.com/read/28719659/dengue-prediction-by-the-web-tweets-are-a-useful-tool-for-estimating-and-forecasting-dengue-at-country-and-city-level
#19
COMPARATIVE STUDY
Cecilia de Almeida Marques-Toledo, Carolin Marlen Degener, Livia Vinhal, Giovanini Coelho, Wagner Meira, Claudia Torres Codeço, Mauro Martins Teixeira
BACKGROUND: Infectious diseases are a leading threat to public health. Accurate and timely monitoring of disease risk and progress can reduce their impact. Mentioning a disease in social networks is correlated with physician visits by patients, and can be used to estimate disease activity. Dengue is the fastest growing mosquito-borne viral disease, with an estimated annual incidence of 390 million infections, of which 96 million manifest clinically. Dengue burden is likely to increase in the future owing to trends toward increased urbanization, scarce water supplies and, possibly, environmental change...
July 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28719400/dengue-vaccines-implications-for-dengue-control
#20
Matthew L Robinson, Anna P Durbin
PURPOSE OF REVIEW: Dengue, the most common arbovirus, is an increasingly significant cause of morbidity worldwide. After decades of research, an approved tetravalent dengue vaccine is finally available. Models constructed using recently available vaccine efficacy data allow for a data-driven discussion of the potential impact of dengue vaccine deployment on global control. RECENT FINDINGS: Phase 3 efficacy trials demonstrated that the approved dengue vaccine, chimeric yellow fever-dengue-tetravalent dengue vaccine, has an efficacy of 60% against dengue illness of any severity...
July 14, 2017: Current Opinion in Infectious Diseases
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