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Rift valley fever

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https://www.readbyqxmd.com/read/28096531/the-first-imported-case-of-rift-valley-fever-in-china-reveals-a-genetic-reassortment-of-different-viral-lineages
#1
Jingyuan Liu, Yulan Sun, Weifeng Shi, Shuguang Tan, Yang Pan, Shujuan Cui, Qingchao Zhang, Xiangfeng Dou, Yanning Lv, Xinyu Li, Xitai Li, Lijuan Chen, Chuansong Quan, Qianli Wang, Yingze Zhao, Qiang Lv, Wenhao Hua, Hui Zeng, Zhihai Chen, Haofeng Xiong, Chengyu Jiang, Xinghuo Pang, Fujie Zhang, Mifang Liang, Guizhen Wu, George F Gao, William J Liu, Ang Li, Quanyi Wang
We report the first imported case of Rift Valley fever (RVF) in China. The patient returned from Angola, a non-epidemic country, with an infection of a new reassortant from different lineages of Rift Valley fever viruses (RVFVs). The patient developed multiorgan dysfunction and gradually recovered with continuous renal replacement therapy and a short regimen of methylprednisolone treatment. The disordered cytokines and chemokines in the plasma of the patient revealed hypercytokinemia, but the levels of protective cytokines were low upon admission and fluctuated as the disease improved...
January 18, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/28096420/drivers-of-rift-valley-fever-epidemics-in-madagascar
#2
Renaud Lancelot, Marina Béral, Vincent Michel Rakotoharinome, Soa-Fy Andriamandimby, Jean-Michel Héraud, Caroline Coste, Andrea Apolloni, Cécile Squarzoni-Diaw, Stéphane de La Rocque, Pierre B H Formenty, Jérémy Bouyer, G R William Wint, Eric Cardinale
Rift Valley fever (RVF) is a vector-borne viral disease widespread in Africa. The primary cycle involves mosquitoes and wild and domestic ruminant hosts. Humans are usually contaminated after contact with infected ruminants. As many environmental, agricultural, epidemiological, and anthropogenic factors are implicated in RVF spread, the multidisciplinary One Health approach was needed to identify the drivers of RVF epidemics in Madagascar. We examined the environmental patterns associated with these epidemics, comparing human and ruminant serological data with environmental and cattle-trade data...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28068340/phylogeography-of-rift-valley-fever-virus-in-africa-and-the-arabian-peninsula
#3
Abdallah M Samy, A Townsend Peterson, Matthew Hall
Rift Valley Fever is an acute zoonotic viral disease caused by Rift Valley Fever virus (RVFV) that affects ruminants and humans in Sub-Saharan Africa and the Arabian Peninsula. We used phylogenetic analyses to understand the demographic history of RVFV populations, using sequence data from the three minigenomic segments of the virus. We used phylogeographic approaches to infer RVFV historical movement patterns across its geographic range, and to reconstruct transitions among host species. Results revealed broad circulation of the virus in East Africa, with many lineages originating in Kenya...
January 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28051125/reconstruction-of-rift-valley-fever-transmission-dynamics-in-madagascar-estimation-of-force-of-infection-from-seroprevalence-surveys-using-bayesian-modelling
#4
Marie-Marie Olive, Vladimir Grosbois, Annelise Tran, Lalaina Arivony Nomenjanahary, Mihaja Rakotoarinoro, Soa-Fy Andriamandimby, Christophe Rogier, Jean-Michel Heraud, Veronique Chevalier
The force of infection (FOI) is one of the key parameters describing the dynamics of transmission of vector-borne diseases. Following the occurrence of two major outbreaks of Rift Valley fever (RVF) in Madagascar in 1990-91 and 2008-09, recent studies suggest that the pattern of RVF virus (RVFV) transmission differed among the four main eco-regions (East, Highlands, North-West and South-West). Using Bayesian hierarchical models fitted to serological data from cattle of known age collected during two surveys (2008 and 2014), we estimated RVF FOI and described its variations over time and space in Madagascar...
January 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28040271/effects-of-climate-change-on-the-occurrence-and-distribution-of-livestock-diseases
#5
B Bett, P Kiunga, J Gachohi, C Sindato, D Mbotha, T Robinson, J Lindahl, D Grace
The planet's mean air and ocean temperatures have been rising over the last century because of increasing greenhouse gas (GHG) emissions. These changes have substantial effects on the epidemiology of infectious diseases. We describe direct and indirect processes linking climate change and infectious diseases in livestock with reference to specific case studies. Some of the studies are used to show a positive association between temperature and expansion of the geographical ranges of arthropod vectors (e.g. Culicoides imicola, which transmits bluetongue virus) while others are used to illustrate an opposite trend (e...
December 14, 2016: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/28032207/vector-borne-pathogen-and-host-evolution-in-a-structured-immuno-epidemiological-system
#6
Hayriye Gulbudak, Vincent L Cannataro, Necibe Tuncer, Maia Martcheva
Vector-borne disease transmission is a common dissemination mode used by many pathogens to spread in a host population. Similar to directly transmitted diseases, the within-host interaction of a vector-borne pathogen and a host's immune system influences the pathogen's transmission potential between hosts via vectors. Yet there are few theoretical studies on virulence-transmission trade-offs and evolution in vector-borne pathogen-host systems. Here, we consider an immuno-epidemiological model that links the within-host dynamics to between-host circulation of a vector-borne disease...
December 28, 2016: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/28029091/serological-and-genomic-evidence-of-rift-valley-fever-virus-during-inter-epidemic-periods-in-mauritania
#7
M Rissmann, M Eiden, B O El Mamy, K Isselmou, B Doumbia, U Ziegler, T Homeier-Bachmann, B Yahya, M H Groschup
Rift Valley fever virus (RVFV) is an emerging pathogen of major concern throughout Africa and the Arabian Peninsula, affecting both livestock and humans. In the past recurrent epidemics were reported in Mauritania and studies focused on the analysis of samples from affected populations during acute outbreaks. To verify characteristics and presence of RVFV during non-epidemic periods we implemented a multi-stage serological and molecular analysis. Serum samples of small ruminants, cattle and camels were obtained from Mauritania during an inter-epidemic period in 2012-2013...
December 28, 2016: Epidemiology and Infection
https://www.readbyqxmd.com/read/28012779/vaccination-of-alpacas-against-rift-valley-fever-virus-safety-immunogenicity-and-pathogenicity-of-mp-12-vaccine
#8
M Rissmann, R Ulrich, C Schröder, B Hammerschmidt, D Hanke, C Mroz, M H Groschup, M Eiden
Rift Valley fever (RVF) is an emerging zoonosis of major public health concern in Africa and Arabia. Previous outbreaks attributed camelids a significant role in the epidemiology of Rift Valley fever virus (RVFV), making them an important target species for vaccination. Using three alpacas as model-organisms for dromedary camels, the safety, immunogenicity and pathogenicity of the MP-12 vaccine were evaluated in this study. To compare both acute and subacute effects, animals were euthanized at 3 and 31days post infection (dpi)...
December 21, 2016: Vaccine
https://www.readbyqxmd.com/read/28011732/effects-of-irrigation-and-rainfall-on-the-population-dynamics-of-rift-valley-fever-and-other-arbovirus-mosquito-vectors-in-the-epidemic-prone-tana-river-county-kenya
#9
R Sang, J Lutomiah, M Said, A Makio, H Koka, E Koskei, A Nyunja, S Owaka, D Matoke-Muhia, S Bukachi, J Lindahl, D Grace, B Bett
Rift Valley fever (RVF) is a mosquito-borne viral zoonosis that is found in most regions of sub-Saharan Africa, and it affects humans, livestock, and some wild ungulates. Outbreaks are precipitated by an abundance of mosquito vectors associated with heavy persistent rainfall with flooding. We determined the impact of flood-irrigation farming and the effect of environmental parameters on the ecology and densities of primary and secondary vectors of the RVF virus (RVFV) in an RVF-epidemic hotspot in the Tana River Basin, Kenya...
December 22, 2016: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28002417/predicting-rift-valley-fever-inter-epidemic-activities-and-outbreak-patterns-insights-from-a-stochastic-host-vector-model
#10
Sansao A Pedro, Shirley Abelman, Henri E Z Tonnang
Rift Valley fever (RVF) outbreaks are recurrent, occurring at irregular intervals of up to 15 years at least in East Africa. Between outbreaks disease inter-epidemic activities exist and occur at low levels and are maintained by female Aedes mcintoshi mosquitoes which transmit the virus to their eggs leading to disease persistence during unfavourable seasons. Here we formulate and analyse a full stochastic host-vector model with two routes of transmission: vertical and horizontal. By applying branching process theory we establish novel relationships between the basic reproduction number, R0, vertical transmission and the invasion and extinction probabilities...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27998581/rift-valley-fever-epidemic-in-niger-near-border-with-mali
#11
Ernest Tambo, Oluwasogo A Olalubi, Moussa Sacko
No abstract text is available yet for this article.
December 2016: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/27986090/first-report-of-l1014f-kdr-mutation-in-culex-pipiens-complex-from-morocco
#12
Meriem Bkhache, Fatim-Zohra Tmimi, Omar Charafeddine, Chafika Faraj, Anna-Bella Failloux, M'hammed Sarih
BACKGROUND: Mosquitoes of the Culex pipiens complex, competent vectors for West Nile virus (WNV) and Rift Valley fever virus (RVFV) are widely targeted by insecticide treatments. The intensive application of chemical insecticides led to the development of resistance in many insects including Culex pipiens mosquitoes. The absence of data on resistance mechanisms in Morocco allow us to assess the levels of lambda-cyhalothrin resistance and the frequency of the mutated gene L1014F kdr in different forms of Cx...
December 16, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27979594/synthesis-and-in-vitro-antiviral-evaluation-of-4-substituted-3-4-dihydropyrimidinones
#13
Dhanabal Kumarasamy, Biswajit Gopal Roy, Joana Rocha-Pereira, Johan Neyts, Satheeshkumar Nanjappan, Subhasis Maity, Musfiqua Mookerjee, Lieve Naesens
A series of 4-substituted 3,4-dihydropyrimidine-2-ones (DHPM) was synthesized, characterized by IR, (1)H NMR, (13)C NMR and HRMS spectra. The compounds were evaluated in vitro for their antiviral activity against a broad range of DNA and RNA viruses, along with assessment for potential cytotoxicity in diverse mammalian cell lines. Compound 4m, which possesses a long lipophilic side chain, was found to be a potent and selective inhibitor of Punta Toro virus, a member of the Bunyaviridae. For Rift Valley fever virus, which is another Bunyavirus, the activity of 4m was negligible...
January 15, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/27977670/serological-evidence-of-contrasted-exposure-to-arboviral-infections-between-islands-of-the-union-of-comoros-indian-ocean
#14
Koussay Dellagi, Nicolas Salez, Marianne Maquart, Sophie Larrieu, Amina Yssouf, Rahamatou Silaï, Isabelle Leparc-Goffart, Pablo Tortosa, Xavier de Lamballerie
A cross sectional serological survey of arboviral infections in humans was conducted on the three islands of the Union of Comoros, Indian Ocean, in order to test a previously suggested contrasted exposure of the three neighboring islands to arthropod-borne epidemics. Four hundred human sera were collected on Ngazidja (Grande Comore), Mwali (Mohéli) and Ndzouani (Anjouan), and were tested by ELISA for IgM and/or IgG antibodies to Dengue (DENV), Chikungunya (CHIKV), Rift Valley fever (RVFV), West Nile (WNV), Tick borne encephalitis (TBEV) and Yellow fever (YFV) viruses and for neutralizing antibodies to DENV serotypes 1-4...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27973528/modelling-vaccination-strategies-against-rift-valley-fever-in-livestock-in-kenya
#15
John M Gachohi, M Kariuki Njenga, Philip Kitala, Bernard Bett
BACKGROUND: The impacts of vaccination on the transmission of Rift Valley fever virus (RVFV) have not been evaluated. We have developed a RVFV transmission model comprising two hosts-cattle as a separate host and sheep and goats as one combined host (herein after referred to as sheep)-and two vectors-Aedes species (spp) and Culex spp-and used it to predict the impacts of: (1) reactive vaccination implemented at various levels of coverage at pre-determined time points, (2) targeted vaccination involving either of the two host species, and (3) a periodic vaccination implemented biannually or annually before an outbreak...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27933051/short-interfering-rna-inhibits-rift-valley-fever-virus-replication-and-degradation-of-protein-kinase-r-in-human-cells
#16
Bonto Faburay, Juergen A Richt
Rift Valley fever virus (RVFV) is a mosquito-borne zoonotic pathogen causing severe outbreaks in humans and livestock in sub-Saharan Africa and the Arabian Peninsula. Human infections are characterized by fever, sometimes leading to encephalitis, retinitis, hemorrhagic fever, and occasionally death. There are currently no fully licensed vaccines or effective therapies for human use. Gene silencing mediated by double-stranded short interfering RNA (siRNA) is a sequence-specific, highly conserved mechanism in eukaryotes, which serves as an antiviral defense mechanism...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27929928/seroepidemiological-survey-of-rift-valley-fever-virus-in-ruminants-in-garissa-kenya
#17
Mark O Nanyingi, Gerald M Muchemi, Samuel M Thumbi, Fredrick Ade, Clayton O Onyango, Stephen G Kiama, Bernard Bett
INTRODUCTION: Rift Valley fever (RVF) is a vector-borne zoonotic disease caused by phlebovirus in the family Bunyaviridae. In Kenya, major outbreaks occurred in 1997-1998 and 2006-2007 leading to human deaths, huge economic losses because of livestock morbidity, mortality, and restrictions on livestock trade. AIM: This study was conducted to determine RVF seroprevalence in cattle, sheep, and goats during an interepidemic period in Garissa County in Kenya. METHODS: In July 2013, we performed a cross-sectional survey and sampled 370 ruminants from eight RVF-prone areas of Garissa County...
December 8, 2016: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/27928533/mosquito-surveillance-and-the-first-record-of-the-invasive-mosquito-species-aedes-stegomyia-albopictus-skuse-diptera-culicidae-in-southern-iran
#18
Sara Doosti, Mohammad Reza Yaghoobi-Ershadi, Francis Schaffner, Seyed Hassan Moosa-Kazemi, Kamran Akbarzadeh, Mohammad Mehdi Gooya, Hassan Vatandoost, Mohammad Reza Shirzadi, Ehsan Mosta-Favi
BACKGROUND: Epidemics of mosquito-borne viral infections such as dengue, chikungunya, West Nile and Rift Valley fevers in neighbouring countries and risk of introduction of exotic vectors into Iran have placed this country at a significant risk for these mosquito-borne diseases. METHODS: After the first dengue case reported in Iran in 2008, active entomological surveillance of Aedes albopictus (Skuse) and Ae. aegypti (Linnaeus) were conducted in May/Jun, Sep, and Oct/Nov, 2008-2014...
August 2016: Iranian Journal of Public Health
https://www.readbyqxmd.com/read/27928094/seroconversion-to-causes-of-febrile-illness-in-mongolian-peacekeepers-deployed-to-south-sudan
#19
Altangerel Enkhtsetseg, Rendoo Davadoorj, Stefan Fernandez, Duangrat Mongkolsirichaikul, Damdin Altantuul, Erdene Elbegdorj, Lkhagvasuren Ganchimeg, Samuel L Yingst
Immediately before deployment (Fall 2012) and after deployment (Spring 2013) in support of United Nations peacekeeping operations, Mongolian Armed Forces medical personnel obtained serum samples from the first contingent of Mongolian peacekeepers deploying to South Sudan to monitor serologic evidence of exposure to diseases that cause acute febrile illness. A total of 632 paired samples were tested for IgG antibody for the following (number of seroconversions in parentheses): Rickettsia (spotted fever and typhus groups) (25), West Nile fever virus (WNV) (23), Coxiella burnetii (causative agent of Q fever) (12), dengue virus (8), leptospirosis (6), chikungunya virus (0), Congo-Crimean hemorrhagic fever virus (0), Japanese encephalitis virus (0), and Rift Valley fever virus (0)...
December 7, 2016: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/27872619/ebola-vp40-in-exosomes-can-cause-immune-cell-dysfunction
#20
Michelle L Pleet, Allison Mathiesen, Catherine DeMarino, Yao A Akpamagbo, Robert A Barclay, Angela Schwab, Sergey Iordanskiy, Gavin C Sampey, Benjamin Lepene, Sergei Nekhai, M J Aman, Fatah Kashanchi
Ebola virus (EBOV) is an enveloped, ssRNA virus from the family Filoviridae capable of causing severe hemorrhagic fever with up to 80-90% mortality rates. The most recent outbreak of EBOV in West Africa starting in 2014 resulted in over 11,300 deaths; however, long-lasting persistence and recurrence in survivors has been documented, potentially leading to further transmission of the virus. We have previously shown that exosomes from cells infected with HIV-1, HTLV-1 and Rift Valley Fever virus are able to transfer viral proteins and non-coding RNAs to naïve recipient cells, resulting in an altered cellular activity...
2016: Frontiers in Microbiology
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