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dengue cost

Allan Rd Nunes, Brenda Elen B Alves, Hannaly Wb Pereira, Yasmin M Nascimento, Ingryd C Morais, José Veríssimo Fernandes, Josélio Mg Araújo, Daniel Cf Lanza
BACKGROUND The genus Flavivirus includes a variety of medically important viruses, including dengue virus (DENV) and Zika virus (ZIKV), which are most prevalent in Brazil. Because the clinical profile of patients affected by different DENV serotypes or ZIKV may be similar, the development of new methods that facilitate a rapid and accurate diagnosis is crucial. OBJECTIVES The current study aimed to develop an improved reverse transcription-polymerase chain reaction (RT-PCR) protocol for universal detection of flaviviruses by using semi-nested primers that discriminate between DENV serotypes and ZIKV...
2018: Memórias do Instituto Oswaldo Cruz
Mohammad Akhoundi, Frédéric Jourdain, Fabrice Chandre, Pascal Delaunay, David Roiz
BACKGROUND: Aedes aegypti and Aedes albopictus are the main vectors for the transmission of several viral pathogens, in particular, dengue, Zika and chikungunya. In the absence of vaccines and treatment, control of Aedes mosquitoes is the only means of keeping these diseases in check. Aedes control is difficult, and it is, therefore, necessary to evaluate the efficacy of novel control methods, particularly those targeting adult and exophilic Ae. albopictus populations. METHODS: We carried out the first evaluation of the effectiveness of a field trap barrier system, i...
February 20, 2018: Parasites & Vectors
Maisa Carla Pereira Parra, Eliane Aparecida Fávaro, Margareth Regina Dibo, Adriano Mondini, Álvaro Eduardo Eiras, Erna Geessien Kroon, Mauro Martins Teixeira, Mauricio Lacerda Nogueira, Francisco Chiaravalloti-Neto
INTRODUCTION: Traditional indices for measuring dengue fever risk in a given area are based on the immature forms of the vector (larvae and pupae surveys). However, this is inefficient because only adult female mosquitoes actually transmit the virus. Based on these assumptions, our objective was to evaluate the association between an entomological index obtained from adult mosquito traps and the occurrence of dengue in a hyperendemic area. Additionally, we compared its cost to that of the Breteau Index (BI)...
February 17, 2018: Acta Tropica
Vanessa R Melanson, Ryan Jochim, Michael Yarnell, Karen Bingham Ferlez, Soumya Shashikumar, Jason H Richardson
Background & objectives: Vector-borne pathogen surveillance programmes typically rely on the collection of large numbers of potential vectors followed by screening protocols focused on detecting pathogens in the arthropods. These processes are laborious, time consuming, expensive, and require screening of large numbers of samples. To streamline the surveillance process, increase sample throughput, and improve cost-effectiveness, a method to detect dengue virus and malaria parasites (Plasmodium falciparum) by leveraging the sugar-feeding behaviour of mosquitoes and their habit of expectorating infectious agents in their saliva during feeding was investigated in this study...
October 2017: Journal of Vector Borne Diseases
Hans J Overgaard, Chamsai Pientong, Kesorn Thaewnongiew, Michael J Bangs, Tipaya Ekalaksananan, Sirinart Aromseree, Thipruethai Phanitchat, Supranee Phanthanawiboon, Benedicte Fustec, Vincent Corbel, Dominique Cerqueira, Neal Alexander
BACKGROUND: Dengue fever is the most common and widespread mosquito-borne arboviral disease in the world. There is a compelling need for cost-effective approaches and practical tools that can reliably measure real-time dengue transmission dynamics that enable more accurate and useful predictions of incidence and outbreaks. Sensitive surveillance tools do not exist today, and only a small handful of new control strategies are available. Vector control remains at the forefront for combating dengue transmission...
February 20, 2018: Trials
Muthiah Chellappandian, Prabhakaran Vasantha-Srinivasan, Sengottayan Senthil-Nathan, Sengodan Karthi, Annamalai Thanigaivel, Athirstam Ponsankar, Kandaswamy Kalaivani, Wayne B Hunter
Plants naturally produce bioactive compounds along with many secondary metabolites which serve as defensive chemical against herbivorers including insect pests. One group of these phytochemicals are the 'Essential Oils' (EO's), which possess an extensive range of biological activity especially insecticidal and insect repellents. This review provides a comprehensive viewpoint on potential modes of action of biosafety plant derived Essential Oils (EO's) along with their principal chemical derivatives against larvae and adult mosquito vectors of dengue virus...
February 13, 2018: Environment International
Jyotiranjan Bal, Nguyen Ngoc Luong, Jisang Park, Ki-Duk Song, Yong-Suk Jang, Dae-Hyuk Kim
BACKGROUND: Dengue is listed as a neglected tropical disease by the Center for Disease Control and Preservation, as there are insufficient integrated surveillance strategies, no effective treatment, and limited licensed vaccines. Consisting of four genetically distinct serotypes, dengue virus (DENV) causes serious life-threatening infections due to its complexity. Antibody-dependent enhancement by pre-existing cross-reactive as well as homotypic antibodies further worsens the clinical symptoms of dengue...
February 16, 2018: Microbial Cell Factories
Doris E Campo-Duarte, Olga Vasilieva, Daiver Cardona-Salgado, Mikhail Svinin
Wolbachia-based biocontrol has recently emerged as a potential method for prevention and control of dengue and other vector-borne diseases. Major vector species, such as Aedes aegypti females, when deliberately infected with Wolbachia become less capable of getting viral infections and transmitting the virus to human hosts. In this paper, we propose an explicit sex-structured population model that describes an interaction of uninfected (wild) male and female mosquitoes and those deliberately infected with wMelPop strain of Wolbachia in the same locality...
February 10, 2018: Journal of Mathematical Biology
Abeer M Alkhaibari, Thierry Maffeis, James C Bull, Tariq M Butt
Mosquitoes transmit several diseases, which are of global significance (malaria, dengue, yellow fever, Zika). The geographic range of mosquitoes is increasing due to climate change, tourism and trade. Both conidial and blastospore formulations of the entomopathogenic fungus, Metarhizium brunneum ARSEF 4556, are being investigated as mosquito larvicides. However, concerns have been raised over possible non-target impacts to arthropod mosquito predators such as larvae of Toxorhynchites brevipalpis which feed on larvae of mosquito vector species...
February 6, 2018: Journal of Invertebrate Pathology
Tesfaye Gelanew, Elizabeth Hunsperger
BACKGROUND: Dengue, caused by one of the four serologically distinct dengue viruses (DENV-1 to - 4), is a mosquito-borne disease of serious global health significance. Reliable and cost-effective diagnostic tests, along with effective vaccines and vector-control strategies, are highly required to reduce dengue morbidity and mortality. Evaluation studies revealed that many commercially available NS1 antigen (Ag) tests have limited sensitivity to DENV-4 serotype compared to the other three serotypes...
February 6, 2018: Virology Journal
Peter J Hotez
Antipoverty vaccines are the vaccines targeting a group of approximately 20 neglected tropical diseases (NTDs), as currently defined by the World Health Organization (WHO). The "antipoverty" moniker refers to the fact that NTDs trap populations in poverty due to their chronic and deleterious effects on child intellect and worker productivity. Therefore, NTD vaccines can be expected to promote both global health and economic advancement. Unfortunately, antipoverty vaccine development has lagged behind vaccines for major childhood infections and pandemic threats, despite evidence for their cost-effectiveness and cost-savings...
February 2, 2018: Human Vaccines & Immunotherapeutics
Jacqueline Kyungah Lim, Mabel Carabali, Jung-Seok Lee, Kang-Sung Lee, Suk Namkung, Sl-Ki Lim, Valéry Ridde, Jose Fernandes, Bertrand Lell, Sultani Hadley Matendechero, Meral Esen, Esther Andia, Noah Oyembo, Ahmed Barro, Emmanuel Bonnet, Sammy M Njenga, Selidji Todagbe Agnandji, Seydou Yaro, Neal Alexander, In-Kyu Yoon
INTRODUCTION: Dengue is an important and well-documented public health problem in the Asia-Pacific and Latin American regions. However, in Africa, information on disease burden is limited to case reports and reports of sporadic outbreaks, thus hindering the implementation of public health actions for disease control. To gather evidence on the undocumented burden of dengue in Africa, epidemiological studies with standardised methods were launched in three locations in Africa. METHODS AND ANALYSIS: In 2014-2017, the Dengue Vaccine Initiative initiated field studies at three sites in Ouagadougou, Burkina Faso; Lambaréné, Gabon and Mombasa, Kenya to obtain comparable incidence data on dengue and assess its burden through standardised hospital-based surveillance and community-based serological methods...
January 21, 2018: BMJ Open
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
Haiyan Sun, Qiang Chen, Huafang Lai
Recent outbreaks of Zika virus (ZIKV) highlight the urgent need to develop efficacious interventions against flaviviruses, many of which cause devastating epidemics around the world. Monoclonal antibodies (mAb) have been at the forefront of treatment for cancer and a wide array of other diseases due to their specificity and potency. While mammalian cell-produced mAbs have shown promise as therapeutic candidates against several flaviviruses, their eventual approval for human application still faces several challenges including their potential risk of predisposing treated patients to more severe secondary infection by a heterologous flavivirus through antibody-dependent enhancement (ADE)...
December 25, 2017: International Journal of Molecular Sciences
Jacqueline Kyungah Lim, Neal Alexander, Gian Luca Di Tanna
BACKGROUND: Dengue fever is rapidly expanding geographically, with about half of the world's population now at risk. Among the various diagnostic options, rapid diagnostic tests (RDTs) are convenient and prompt, but limited in terms of accuracy and availability. METHODS: A systematic review was conducted of published data on the use of RDTs for dengue with respect to their economic impact. The search was conducted with combinations of key search terms, including "((Dengue[Title]) AND cost/economic)" and "rapid diagnostic test/assay (or point-of-care)"...
December 29, 2017: BMC Health Services Research
Wu Zeng, Yara A Halasa-Rappel, Nicolas Baurin, Laurent Coudeville, Donald S Shepard
Following publication of results from two phase-3 clinical trials in 10 countries or territories, endemic countries began licensing the first dengue vaccine in 2015. Using a published mathematical model, we evaluated the cost-effectiveness of dengue vaccination in populations similar to those at the trial sites in those same Latin American and Asian countries. Our main scenarios (30-year horizon, 80% coverage) entailed 3-dose routine vaccinations costing US$20/dose beginning at age 9, potentially supplemented by catch-up programs of 4- or 8-year cohorts...
January 8, 2018: Vaccine
Johanna E Fraser, Jyotika Taneja De Bruyne, Iñaki Iturbe-Ormaetxe, Justin Stepnell, Rhiannon L Burns, Heather A Flores, Scott L O'Neill
Wolbachia pipientis from Drosophila melanogaster (wMel) is an endosymbiotic bacterium that restricts transmission of human pathogenic flaviviruses and alphaviruses, including dengue, Zika, and chikungunya viruses, when introduced into the mosquito vector Aedes aegypti. To date, wMel-infected Ae. aegypti have been released in field trials in 5 countries to evaluate the effectiveness of this strategy for disease control. Despite the success in establishing wMel-infected mosquitoes in wild populations, and the well-characterized antiviral capabilities of wMel, transinfecting different or additional Wolbachia strains into Ae...
December 2017: PLoS Pathogens
Muhammad Tahirul Qamar, Usman Ali Ashfaq, Kishver Tusleem, Arooj Mumtaz, Quratulain Tariq, Alina Goheer, Bilal Ahmed
Dengue infection is prevailing among the people not only from the developing countries but also from the developed countries due to its high morbidity rate around the globe. Hence, due to the unavailability of any suitable vaccine for rigorous dengue virus (DENV), the only mode of its treatment is prevention. The circumstances require an urgent development of efficient and practical treatment to deal with these serotypes. The severe effects and cost of synthetic vaccines simulated researchers to find anti-viral agents from medicinal plants...
November 2017: Pakistan Journal of Pharmaceutical Sciences
Meta Roestenberg, Annie Mo, Peter G Kremsner, Maria Yazdanbakhsh
The principle of deliberately infecting humans with infectious agents in a controlled setting, so-called controlled human infections (CHI), is not novel. Many CHI models have a long history and were established decades ago such as the intentional exposure to yellow fever and dengue performed in the 1900's (Reed, 1902) [2]. In these times bioethics and scientific reasoning were in their infancy. Nowadays, clinical trials are highly regulated and CHI are executed worldwide. Controlled human malaria infections and influenza infections are the two most frequently practiced...
December 18, 2017: Vaccine
Cédric Charretier, Aure Saulnier, Loïc Benair, Corinne Armanet, Isabelle Bassard, Sandra Daulon, Bertrand Bernigaud, Emanuel Rodrigues de Sousa, Clémence Gonthier, Edouard Zorn, Emmanuelle Vetter, Claire Saintpierre, Patrice Riou, David Gaillac
The classical cell-culture methods, such as cell culture infectious dose 50% (CCID50 ) assays, are time-consuming, end-point assays currently used during the development of a viral vaccine production process to measure viral infectious titers. However, they are not suitable for handling the large number of tests required for high-throughput and large-scale screening analyses. Impedance-based bio-sensing techniques used in real-time cell analysis (RTCA) to assess cell layer biological status in vitro, provide real-time data...
February 2018: Journal of Virological Methods
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