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https://www.readbyqxmd.com/read/28584177/structural-drivers-of-vulnerability-to-zoonotic-disease-in-africa
#1
Vupenyu Dzingirai, Salome Bukachi, Melissa Leach, Lindiwe Mangwanya, Ian Scoones, Annie Wilkinson
This paper argues that addressing the underlying structural drivers of disease vulnerability is essential for a 'One Health' approach to tackling zoonotic diseases in Africa. Through three case studies-trypanosomiasis in Zimbabwe, Ebola and Lassa fever in Sierra Leone and Rift Valley fever in Kenya-we show how political interests, commercial investments and conflict and securitization all generate patterns of vulnerability, reshaping the political ecology of disease landscapes, influencing traditional coping mechanisms and affecting health service provision and outbreak responses...
July 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28584172/integrative-modelling-for-one-health-pattern-process-and-participation
#2
REVIEW
I Scoones, K Jones, G Lo Iacono, D W Redding, A Wilkinson, J L N Wood
This paper argues for an integrative modelling approach for understanding zoonoses disease dynamics, combining process, pattern and participatory models. Each type of modelling provides important insights, but all are limited. Combining these in a '3P' approach offers the opportunity for a productive conversation between modelling efforts, contributing to a 'One Health' agenda. The aim is not to come up with a composite model, but seek synergies between perspectives, encouraging cross-disciplinary interactions...
July 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28584171/local-disease-ecosystem-livelihood-dynamics-reflections-from-comparative-case-studies-in-africa
#3
Melissa Leach, Bernard Bett, M Said, Salome Bukachi, Rosemary Sang, Neil Anderson, Noreen Machila, Joanna Kuleszo, Kathryn Schaten, Vupenyu Dzingirai, Lindiwe Mangwanya, Yaa Ntiamoa-Baidu, Elaine Lawson, Kofi Amponsah-Mensah, Lina M Moses, Annie Wilkinson, Donald S Grant, James Koninga
This article explores the implications for human health of local interactions between disease, ecosystems and livelihoods. Five interdisciplinary case studies addressed zoonotic diseases in African settings: Rift Valley fever (RVF) in Kenya, human African trypanosomiasis in Zambia and Zimbabwe, Lassa fever in Sierra Leone and henipaviruses in Ghana. Each explored how ecological changes and human-ecosystem interactions affect pathogen dynamics and hence the likelihood of zoonotic spillover and transmission, and how socially differentiated peoples' interactions with ecosystems and animals affect their exposure to disease...
July 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28572385/structural-basis-for-antibody-mediated-neutralization-of-lassa-virus
#4
Kathryn M Hastie, Michelle A Zandonatti, Lara M Kleinfelter, Megan L Heinrich, Megan M Rowland, Kartik Chandran, Luis M Branco, James E Robinson, Robert F Garry, Erica Ollmann Saphire
The arenavirus Lassa causes severe hemorrhagic fever and a significant disease burden in West Africa every year. The glycoprotein, GPC, is the sole antigen expressed on the viral surface and the critical target for antibody-mediated neutralization. Here we present the crystal structure of the trimeric, prefusion ectodomain of Lassa GP bound to a neutralizing antibody from a human survivor at 3.2-angstrom resolution. The antibody extensively anchors two monomers together at the base of the trimer, and biochemical analysis suggests that it neutralizes by inhibiting conformational changes required for entry...
June 2, 2017: Science
https://www.readbyqxmd.com/read/28572362/a-step-on-the-path-to-a-lassa-vaccine
#5
EDITORIAL
Valda Vinson
No abstract text is available yet for this article.
June 2, 2017: Science
https://www.readbyqxmd.com/read/28561264/virulence-markers-associated-with-trueperella-pyogenes-infections-in-livestock-and-companion-animals
#6
R M Risseti, E Zastempowska, M Twarużek, H Lassa, J C F Pantoja, A P C de Vargas, S T Guerra, C A D Bolaños, C L de Paula, A C Alves, B S Colhado, F V R Portilho, C Tasca, G H B Lara, M G Ribeiro
Trueperella pyogenes is an opportunistic pathogen that causes diverse pyogenic infections in livestock. The genes that encode the exotoxin pyolysin (plo) and other putative factors that promote adhesion of pathogen to host cells (fimbriae fimA, fimC, fimE, fimG, neuraminidases nanH, nanP, and collagen-binding protein cbpA) have been associated with virulence, particularly in mastitis and uterus infections of dairy cows. However, the role of these virulence markers in the pathogenicity of the agent in domestic animals infections still is incompletely understood...
May 31, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28555386/molecular-pathogenesis-of-viral-hemorrhagic-fever
#7
REVIEW
Christopher F Basler
The clinical syndrome referred to as viral hemorrhagic fever (VHF) can be caused by several different families of RNA viruses, including select members of the arenaviruses, bunyaviruses, filoviruses, and flaviviruses. VHF is characterized by malaise, fever, vascular permeability, decreased plasma volume, coagulation abnormalities, and varying degrees of hemorrhage. Study of the filovirus Ebola virus has demonstrated a critical role for suppression of innate antiviral defenses in viral pathogenesis. Additionally, antigen-presenting cells are targets of productive infection and immune dysregulation...
May 29, 2017: Seminars in Immunopathology
https://www.readbyqxmd.com/read/28511600/knowledge-attitude-and-practices-toward-lassa-fever-control-and-prevention-among-residents-of-ile-ife-southwest-nigeria
#8
S A Olowookere, C A Adegbenro, A Idowu, A G Omisore, O M Shabi, U R Ikem, G A Ekwere, I F Oderinde
Lassa fever had been reported as a cause of death especially in endemic parts of Nigeria. This study assessed the knowledge, attitude, and practices toward Lassa fever control and prevention among residents of Ile-Ife, southwest Nigeria. Descriptive cross-sectional study was conducted among consenting randomly selected adults using an interviewer administered questionnaire. Data were analyzed using descriptive and inferential statistics. A total of 400 questionnaires with completed data were analyzed (response rate 96%)...
January 2017: International Quarterly of Community Health Education
https://www.readbyqxmd.com/read/28508222/lassa-virus-reverse-genetics
#9
Luis Martínez-Sobrido, Slobodan Paessler, Juan Carlos de la Torre
The Old World (OW) arenavirus Lassa (LASV ) is estimated to infect several hundred thousand people yearly in West Africa, resulting in high numbers of Lassa fever (LF), a viral hemorrhagic fever (HF) disease associated with high morbidity and mortality. To date, no licensed vaccines are available to LASV infections, and anti-LASV drug therapy is limited to an off-label use of ribavirin (Rib) that is only partially effective. The development of reverse genetics has provided investigators with a novel and powerful approach for the investigation of the molecular, cell biology, and pathogenesis of LASV...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28505171/rapid-deployment-of-a-mobile-biosafety-level-3-laboratory-in-sierra-leone-during-the-2014-ebola-virus-epidemic
#10
Yi Zhang, Yan Gong, Chengyu Wang, Wensen Liu, Zhongyi Wang, Zhiping Xia, Zhaoyang Bu, Huijun Lu, Yang Sun, Xiaoguang Zhang, Yuxi Cao, Fan Yang, Haoxiang Su, Yi Hu, Yongqiang Deng, Bo Zhou, Zongzheng Zhao, Yingying Fu, David Kargbo, Foday Dafae, Brima Kargbo, Alex Kanu, Linna Liu, Jun Qian, Zhendong Guo
BACKGROUND: Ebola virus emerged in West Africa in December 2013. The high population mobility and poor public health infrastructure in this region led to the development of the largest Ebola virus disease (EVD) outbreak to date. METHODOLOGY/PRINCIPAL FINDINGS: On September 26, 2014, China dispatched a Mobile Biosafety Level-3 Laboratory (MBSL-3 Lab) and a well-trained diagnostic team to Sierra Leone to assist in EVD diagnosis using quantitative real-time PCR, which allowed the diagnosis of suspected EVD cases in less than 4 hours from the time of sample receiving...
May 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28498311/differential-immune-responses-to-new-world-and-old-world-mammalian-arenaviruses
#11
REVIEW
Hinh Ly
Some New World (NW) and Old World (OW) mammalian arenaviruses are emerging, zoonotic viruses that can cause lethal hemorrhagic fever (HF) infections in humans. While these are closely related RNA viruses, the infected hosts appear to mount different types of immune responses against them. Lassa virus (LASV) infection, for example, results in suppressed immune function in progressive disease stage, whereas patients infected with Junín virus (JUNV) develop overt pro-inflammatory cytokine production. These viruses have also evolved different molecular strategies to evade host immune recognition and activation...
May 12, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28449693/no-measurable-adverse-effects-of-lassa-morogoro-and-gairo-arenaviruses-on-their-rodent-reservoir-host-in-natural-conditions
#12
Joachim Mariën, Benny Borremans, Sophie Gryseels, Barré Soropogui, Luc De Bruyn, Gédéon Ngiala Bongo, Beate Becker-Ziaja, Joëlle Goüy de Bellocq, Stephan Günther, N'Faly Magassouba, Herwig Leirs, Elisabeth Fichet-Calvet
BACKGROUND: In order to optimize net transmission success, parasites are hypothesized to evolve towards causing minimal damage to their reservoir host while obtaining high shedding rates. For many parasite species however this paradigm has not been tested, and conflicting results have been found regarding the effect of arenaviruses on their rodent host species. The rodent Mastomys natalensis is the natural reservoir host of several arenaviruses, including Lassa virus that is known to cause Lassa haemorrhagic fever in humans...
April 27, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28448640/mapping-of-the-lassa-virus-lamp1-binding-site-reveals-unique-determinants-not-shared-by-other-old-world-arenaviruses
#13
Hadar Israeli, Hadas Cohen-Dvashi, Anastasiya Shulman, Amir Shimon, Ron Diskin
Cell entry of many enveloped viruses occurs by engagement with cellular receptors, followed by internalization into endocytic compartments and pH-induced membrane fusion. A previously unnoticed step of receptor switching was found to be critical during cell entry of two devastating human pathogens: Ebola and Lassa viruses. Our recent studies revealed the functional role of receptor switching to LAMP1 for triggering membrane fusion by Lassa virus and showed the involvement of conserved histidines in this switching, suggesting that other viruses from this family may also switch to LAMP1...
April 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28438110/temporal-progression-of-lesions-in-guinea-pigs-infected-with-lassa-virus
#14
T M Bell, C I Shaia, J J Bearss, M E Mattix, K A Koistinen, S P Honnold, X Zeng, C D Blancett, G C Donnelly, J D Shamblin, E R Wilkinson, K A Cashman
Lassa virus (LASV) infection causes an acute, multisystemic viral hemorrhagic fever that annually infects an estimated 100 000 to 300 000 persons in West Africa. This pathogenesis study evaluated the temporal progression of disease in guinea pigs following aerosol and subcutaneous inoculation of the Josiah strain of LASV as well as the usefulness of Strain 13 guinea pigs as an animal model for Lassa fever. After experimental infection, guinea pigs ( Cavia porcellus; n = 67) were serially sampled to evaluate the temporal progression of infection, gross and histologic lesions, and serum chemistry and hematologic changes...
May 2017: Veterinary Pathology
https://www.readbyqxmd.com/read/28420391/interactive-open-source-travel-time-scenario-modelling-tools-to-facilitate-participation-in-health-service-access-analysis
#15
Rohan Fisher, Jonatan Lassa
BACKGROUND: Modelling travel time to services has become a common public health tool for planning service provision but the usefulness of these analyses is constrained by the availability of accurate input data and limitations inherent in the assumptions and parameterisation. This is particularly an issue in the developing world where access to basic data is limited and travel is often complex and multi-modal. Improving the accuracy and relevance in this context requires greater accessibility to, and flexibility in, travel time modelling tools to facilitate the incorporation of local knowledge and the rapid exploration of multiple travel scenarios...
April 18, 2017: International Journal of Health Geographics
https://www.readbyqxmd.com/read/28404674/laboratory-diagnosis-of-lassa-fever
#16
REVIEW
Vanessa Raabe, Jeffrey Koehler
Lassa virus remains an important cause of illness in West Africa and among the travelers returning from this region with an acute febrile illness. The symptoms of Lassa fever can be nonspecific and mimic those of other endemic infections, especially early in illness, making a clinical diagnosis difficult; therefore, laboratory testing is needed to confirm the diagnosis. An early identification of Lassa fever is crucial for maximizing the benefit of available antiviral therapy, as treatment efficacy rapidly decreases following the clinical onset of the disease...
June 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28356221/rapid-detection-of-all-known-ebolavirus-species-by-reverse-transcription-loop-mediated-isothermal-amplification-rt-lamp
#17
Olamide K Oloniniyi, Yohei Kurosaki, Hiroko Miyamoto, Ayato Takada, Jiro Yasuda
Ebola virus disease (EVD), a highly virulent infectious disease caused by ebolaviruses, has a fatality rate of 25-90%. Without a licensed chemotherapeutic agent or vaccine for the treatment and prevention of EVD, control of outbreaks requires accurate and rapid diagnosis of cases. In this study, five sets of six oligonucleotide primers targeting the nucleoprotein gene were designed for specific identification of each of the five ebolavirus species using reverse transcription-loop mediated isothermal amplification (RT-LAMP) assay...
March 27, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28315708/2016-international-meeting-of-the-global-virus-network
#18
REVIEW
Ramesh Akkina, Heinz Ellerbrok, William Hall, Hideki Hasegawa, Yasushi Kawaguchi, Harold Kleanthous, Edward McSweegan, Natalia Mercer, Victor Romanowski, Hirofumi Sawa, Anders Vahlne
The Global Virus Network (GVN) was established in 2011 in order to strengthen research and responses to current viral causes of human disease and to prepare against new viral pandemic threats. There are now 38 GVN Centers of Excellence and 6 Affiliate laboratories in 24 countries. GVN scientists meet annually to learn about each other's current research, address collaborative priorities and plan future programs. The 2016 meeting was held from October 23-25 in Hokkaido, Japan, in partnership with the Japanese Society for Virology, the National Institute of Infectious Diseases of Japan and the Research Center for Zoonosis Control of Hokkaido University...
June 2017: Antiviral Research
https://www.readbyqxmd.com/read/28278352/mobile-phone-based-interactive-voice-response-as-a-tool-for-improving-access-to-healthcare-in-remote-areas-in-ghana-an-evaluation-of-user-experiences
#19
J Brinkel, J May, R Krumkamp, M Lamshöft, B Kreuels, E Owusu-Dabo, A Mohammed, A Bonacic Marinovic, P Dako-Gyeke, A Krämer, J N Fobil
OBJECTIVES: To investigate and determine the factors that enhanced or constituted barriers to the acceptance of an mHealth system which was piloted in Asante-Akim North District of Ghana to support healthcare of children. METHODS: Four semi-structured focus group discussions were conducted with a total of 37 mothers. Participants were selected from a study population of mothers who subscribed to a pilot mHealth system which used an interactive voice response (IVR) for its operations...
March 9, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28179007/global-research-trends-of-world-health-organization-s-top-eight-emerging-pathogens
#20
Waleed M Sweileh
BACKGROUND: On December 8(th), 2015, World Health Organization published a priority list of eight pathogens expected to cause severe outbreaks in the near future. To better understand global research trends and characteristics of publications on these emerging pathogens, we carried out this bibliometric study hoping to contribute to global awareness and preparedness toward this topic. METHOD: Scopus database was searched for the following pathogens/infectious diseases: Ebola, Marburg, Lassa, Rift valley, Crimean-Congo, Nipah, Middle Eastern Respiratory Syndrome (MERS), and Severe Respiratory Acute Syndrome (SARS)...
February 8, 2017: Globalization and Health
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