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West nile fever

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https://www.readbyqxmd.com/read/28332648/west-nile-virus-epizootics-in-the-camargue-france-in-2015-and-reinforcement-of-surveillance-and-control-networks
#1
C Bahuon, C Marcillaud-Pitel, L Bournez, A Leblond, C Beck, J Hars, I Leparc-Goffart, G L'Ambert, M-C Paty, L Cavalerie, C Daix, P Tritz, B Durand, S Zientara, S Lecollinet
West Nile virus (WNV) infection is a non-contagious disease mainly transmitted by the bites of infected mosquitoes from the genus Culex. The virus is maintained in a mosquito-bird-mosquito cycle, and can accidentally be transmitted to mammalian hosts. Among mammalian hosts, equines and humans are the most sensitive to WNV infection and can develop severe meningoencephalitis. As WNV infections are zoonotic and can be severe in humans and equines, West Nile fever is considered to be a public and animal health concern...
December 2016: Revue Scientifique et Technique
https://www.readbyqxmd.com/read/28278327/chorioretinal-lesions-presumed-secondary-to-zika-virus-infection-in-an-immunocompromised-adult
#2
Christopher R Henry, Luma Al-Attar, Alexis M Cruz-Chacón, Janet L Davis
Importance: Zika virus has spread rapidly throughout the Americas since 2015. The public health implications of Zika virus infection lend special importance to identifying the virus in unsuspected hosts. Objective: To describe relevant imaging studies and clinical features of chorioretinal lesions that are presumably associated with Zika virus and that share analogous features with chorioretinal lesions reported in cases of Dengue fever and West Nile virus. Design, Setting, and Participants: This is a case report from an academic referral center in Miami, Florida, of a woman in her 60s from Guaynabo, Puerto Rico, who presented with reduced visual acuity and bilateral diffuse, subretinal, confluent, placoid, and multifocal chorioretinal lesions...
March 9, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28270191/isolation-and-molecular-characterisation-of-halicephalobus-gingivalis-in-the-brain-of-a-horse-in-piedmont-italy
#3
Maria Domenica Pintore, Francesco Cerutti, Antonio D'Angelo, Cristiano Corona, Paola Gazzuola, Loretta Masoero, Corrado Colombo, Roberto Bona, Carlo Cantile, Simone Peletto, Cristina Casalone, Barbara Iulini
BACKGROUND: A fatal case of meningoencephalitis was reported in a 13-year-old Koninklijk Warmbloed Paard Nederland stallion, suspected of West Nile virus (WNV) infection, in the Piedmont region of Italy. Clinical signs included right head tilt and circling, depression alternated with excitability, fever and lateral strabismus. Combined treatment consisting of dimethylsulfoxide, dexamethasone, sulphonamides and sedative was administered, but because of the poor conditions the horse was euthanatized and submitted for necropsy...
March 7, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28261172/the-complement-system-in-flavivirus-infections
#4
Jonas N Conde, Emiliana M Silva, Angela S Barbosa, Ronaldo Mohana-Borges
The incidence of flavivirus infections has increased dramatically in recent decades in tropical and sub-tropical climates worldwide, affecting hundreds of millions of people each year. The Flaviviridae family includes dengue, West Nile, Zika, Japanese encephalitis, and yellow fever viruses that are typically transmitted by mosquitoes or ticks, and cause a wide range of symptoms, such as fever, shock, meningitis, paralysis, birth defects, and death. The flavivirus genome is composed of a single positive-sense RNA molecule encoding a single viral polyprotein...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28252204/emerging-arboviral-human-diseases-in-southern-europe
#5
REVIEW
Anna Papa
Southern Europe is characterized by unique landscape and climate which attract tourists, but also arthropod vectors, some of them carrying pathogens. Among several arboviral diseases that emerged in the region during the last decade, West Nile fever accounted for high number of human cases and fatalities, while Crimean-Congo hemorrhagic fever expanded its geographic distribution, and is considered as a real threat for Europe. Viruses evolve rapidly and acquire mutations making themselves stronger and naive populations more vulnerable...
March 2, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28243937/zika-virus-an-emerging-flavivirus
#6
REVIEW
Sang-Im Yun, Young-Min Lee
Zika virus (ZIKV) is a previously little-known flavivirus closely related to Japanese encephalitis, West Nile, dengue, and yellow fever viruses, all of which are primarily transmitted by blood-sucking mosquitoes. Since its discovery in Uganda in 1947, ZIKV has continued to expand its geographic range, from equatorial Africa and Asia to the Pacific Islands, then further afield to South and Central America and the Caribbean. Currently, ZIKV is actively circulating not only in much of Latin America and its neighbors but also in parts of the Pacific Islands and Southeast Asia...
March 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28228395/antibody-responses-to-zika-virus-infections-in-flavivirus-endemic-environments
#7
Sarah L Keasey, Christine L Pugh, Stig M R Jensen, Jessica L Smith, Robert D Hontz, Anna P Durbin, Dawn M Dudley, David H O'Connor, Robert G Ulrich
Zika virus (ZIKV) infections occur in areas where dengue (DENV), West Nile (WNV), yellow fever (YFV), and other viruses of the genus Flavivirus co-circulate. The envelope protein (E) of these closely related flaviviruses induces specific long-term immunity, yet subsequent infections are associated with cross-reactive antibody responses that may enhance disease susceptibility and severity. To gain a better understanding of ZIKV infections against a background of similar viral diseases, we examined serological immune responses to ZIKV, WNV, DENV and YFV infections of humans and non-human primates (NHP)...
February 22, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28215143/identifying-the-main-mosquito-species-in-the-taiwan-strait-using-dna-barcoding
#8
Bo Gao, Yiliang Fang, Jianqing Zhang, Rongquan Wu, Baohai Xu, Lianhui Xie
Mosquitoes can transmit many types of viruses such West Nile virus and Zika virus and are responsible for virus-causing diseases including malaria, Dengue fever, yellow fever, lymphatic filariasis, and Japanese B encephalitis. On January 19, 2016, the first case of Zika virus infection was identified in Taiwan, which presents the need for studying the mosquito species in the Taiwan Strait and evaluating the risk of the outbreak of this infection. In this study, we collected a total of 144 specimens from 42 mosquito specimens belonging to 9 genera from both sides of the Taiwan Strait during 2013 and 2014...
February 17, 2017: Combinatorial Chemistry & High Throughput Screening
https://www.readbyqxmd.com/read/28214373/improved-detection-of-zika-virus-rna-in-human-and-animal-specimens-by-a-novel-highly-sensitive-and-specific-real-time-rt-pcr-assay-targeting-the-5-untranslated-region-of-zika-virus
#9
Jasper Fuk-Woo Chan, Cyril Chik-Yan Yip, Kah-Meng Tee, Zheng Zhu, Jessica Oi-Ling Tsang, Kenn Ka-Heng Chik, Terance Gi-Wai Tsang, Chris Chung-Sing Chan, Vincent Kwok-Man Poon, Siddharth Sridhar, Feifei Yin, Ivan Fan-Ngai Hung, Sandy Ka-Yee Chau, Anna Jinxia Zhang, Kwok-Hung Chan, Kwok-Yung Yuen
OBJECTIVE AND METHOD: We developed and evaluated five novel real-time RT-PCR assays targeting conserved regions in the 5'-untranslated region (5'-UTR), envelope (E'), non-structural protein 2A (NS2A), NS5, and 3'-UTR of the ZIKV genome. RESULTS: The ZIKV-5'-UTR assay exhibited the lowest in-vitro limit of detection (5-10 RNA copies/reaction and 3.0×10(-1) plaque-forming units/ml). Compared to the modified version of a widely adopted RT-PCR assay targeting the ZIKV-E gene, the ZIKV-5'-UTR assay showed better sensitivity in human clinical specimens, and representative mouse specimens, including many organs which are known to be involved in human ZIKV infection but difficult to obtain in clinical settings...
February 18, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28212847/risk-mapping-of-west-nile-virus-circulation-in-spain-2015
#10
Amaya Sánchez-Gómez, Carmen Amela, Eduardo Fernández-Carrión, Marta Martínez-Avilés, José Manuel Sánchez-Vizcaíno, María José Sierra-Moros
West Nile fever is an emergent disease in Europe. The objective of this study was to conduct a predictive risk mapping of West Nile Virus (WNV) circulation in Spain based on historical data of WNV circulation. Areas of Spain with evidence of WNV circulation were mapped based on data from notifications to the surveillance systems and a literature review. A logistic regression-based spatial model was used to assess the probability of WNV circulation. Data were analyzed at municipality level. Mean temperatures of the period from June to October, presence of wetlands and presence of Special Protection Areas for birds were considered as potential predictors...
May 2017: Acta Tropica
https://www.readbyqxmd.com/read/28212379/distribution-and-abundance-of-key-vectors-of-rift-valley-fever-and-other-arboviruses-in-two-ecologically-distinct-counties-in-kenya
#11
Rosemary Sang, Samwel Arum, Edith Chepkorir, Gladys Mosomtai, Caroline Tigoi, Faith Sigei, Olivia Wesula Lwande, Tobias Landmann, Hippolyte Affognon, Clas Ahlm, Magnus Evander
BACKGROUND: Rift Valley fever (RVF) is a mosquito-borne viral zoonosis of ruminants and humans that causes outbreaks in Africa and the Arabian Peninsula with significant public health and economic consequences. Humans become infected through mosquito bites and contact with infected livestock. The virus is maintained between outbreaks through vertically infected eggs of the primary vectors of Aedes species which emerge following rains with extensive flooding. Infected female mosquitoes initiate transmission among nearby animals, which amplifies virus, thereby infecting more mosquitoes and moving the virus beyond the initial point of emergence...
February 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28191786/quantifying-the-potential-pathways-and-locations-of-rift-valley-fever-virus-entry-into-the-united-states
#12
A J Golnar, R C Kading, G L Hamer
The global invasion of West Nile virus, chikungunya virus and Zika virus in the past two decades suggests an increasing rate of mosquito-borne virus (arbovirus) dispersal. Rift Valley fever virus (RVFV) is an arbovirus identified as a high-consequence threat to the United States (USA) because of the severe economic and health consequences associated with disease. Numerous studies demonstrate that the USA is receptive to RVFV transmission based on the widespread presence of competent mosquito species and vertebrate species...
February 12, 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/28187130/detection-of-the-mosquito-borne-flaviviruses-west-nile-dengue-saint-louis-encephalitis-ilheus-bussuquara-and-yellow-fever-in-free-ranging-black-howlers-alouatta-caraya-of-northeastern-argentina
#13
María A Morales, Cintia M Fabbri, Gabriel E Zunino, Martín M Kowalewski, Victoria C Luppo, Delia A Enría, Silvana C Levis, Gladys E Calderón
Several medically important mosquito-borne flaviviruses have been detected in Argentina in recent years: Dengue (DENV), St. Louis encephalitis (SLEV), West Nile (WNV) and Yellow Fever (YFV) viruses. Evidence of Bussuquara virus (BSQV) and Ilheus virus (ILHV) activity were found, but they have not been associated with human disease. Non-human primates can act as important hosts in the natural cycle of flaviviruses and serological studies can lead to improved understanding of virus circulation dynamics and host susceptibility...
February 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28179396/the-antigenic-structure-of-zika-virus-and-its-relation-to-other-flaviviruses-implications-for-infection-and-immunoprophylaxis
#14
REVIEW
Franz X Heinz, Karin Stiasny
Zika virus was discovered ∼70 years ago in Uganda and maintained a low profile as a human disease agent in Africa and Asia. Only recently has it caused explosive outbreaks in previously unaffected regions, first in Oceania and then in the Americas since 2015. Of special concern is the newly identified link between congenital malformations (especially microcephaly) and Zika virus infections during pregnancy. At present, it is unclear whether Zika virus changed its pathogenicity or whether the huge number of infections allowed the recognition of a previously cryptic pathogenic property...
March 2017: Microbiology and Molecular Biology Reviews: MMBR
https://www.readbyqxmd.com/read/28152048/zika-virus-antagonizes-type-i-interferon-responses-during-infection-of-human-dendritic-cells
#15
James R Bowen, Kendra M Quicke, Mohan S Maddur, Justin T O'Neal, Circe E McDonald, Nadia B Fedorova, Vinita Puri, Reed S Shabman, Bali Pulendran, Mehul S Suthar
Zika virus (ZIKV) is an emerging mosquito-borne flavivirus that is causally linked to severe neonatal birth defects, including microcephaly, and is associated with Guillain-Barre syndrome in adults. Dendritic cells (DCs) are an important cell type during infection by multiple mosquito-borne flaviviruses, including dengue virus, West Nile virus, Japanese encephalitis virus, and yellow fever virus. Despite this, the interplay between ZIKV and DCs remains poorly defined. Here, we found human DCs supported productive infection by a contemporary Puerto Rican isolate with considerable variability in viral replication, but not viral binding, between DCs from different donors...
February 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28151637/interaction-of-zika-virus-envelope-protein-with-glycosaminoglycans
#16
So Young Kim, Jing Zhao, Xinyue Liu, Keith Fraser, Lei Lin, Xing Zhang, Fuming Zhang, Jonathan S Dordick, Robert J Linhardt
In February 2016, the World Health Organization declared a Public Health Emergency of International Concern on Zika Virus (ZIKV), due to its association with severe fetal anomalies of congenitally infected humans. This has led to urgent efforts by academic, federal, and industry research groups to better understand pathogenesis of ZIKV and to developing detection methods, therapeutic strategies and vaccines. Although we still do not have the entire picture of the pathogenesis of ZIKV, extensive research has been conducted on related pathogenic flaviviruses (i...
February 2, 2017: Biochemistry
https://www.readbyqxmd.com/read/28134093/population-dynamics-of-mosquito-species-in-a-west-nile-virus-endemic-area-in-madagascar
#17
Luciano Michaël Tantely, Catherine Cêtre-Sossah, Tsiriniaina Rakotondranaivo, Eric Cardinale, Sébastien Boyer
Human and animal serological surveys suggest that West Nile virus (WNV) circulation is widely distributed in Madagascar. However, there are no reported West Nile fever outbreaks or epizootics in the country and only one fatal human case has been reported to date. Currently there is very limited information on the maintenance and the transmission of WNV in Madagascar and particularly on the mosquito species involved in transmission cycles. In 2014, we initiated a study to investigate mosquito species composition, relative abundance, and trophic behavior in Mitsinjo District close to Lake Kinkony, a WNV endemic area in north-western Madagascar...
2017: Parasite: Journal de la Société Française de Parasitologie
https://www.readbyqxmd.com/read/28131384/seroprevalence-of-west-nile-virus-antibodies-in-equids-in-the-north-east-of-algeria-and-detection-of-virus-circulation-in-2014
#18
Ismail Lafri, Christine M Prat, Idir Bitam, Patrick Gravier, Mohamed Besbaci, Fayçal Zeroual, Meriem Hind Ben-Mahdi, Bernard Davoust, Isabelle Leparc-Goffart
West Nile fever (WNF) is a viral disease of wild birds transmitted by mosquitoes. Humans and equids can also be affected and suffer from meningoencephalitis. In Algeria, since the 1994 epidemic, no data on WNV circulation was available until 2012. In September 2012, a fatal human case of WNV neuro-invasive infection occurred in Jijel province. This study describes the first seroprevalence study of West Nile virus (WNV) antibodies conducted in the equine population in Algeria. During 2014, serum samples were collected from 293 equids (222 donkeys and 71 horses) asymptomatic and unvaccinated for WNV in three localities in Northeastern wetlands of Algeria...
February 2017: Comparative Immunology, Microbiology and Infectious Diseases
https://www.readbyqxmd.com/read/28126462/exploring-genetic-variation-in-haplotypes-of-the-filariasis-vector-culex-quinquefasciatus-diptera-culicidae-through-dna-barcoding
#19
Chithravel Vadivalagan, Pushparaj Karthika, Kadarkarai Murugan, Chellasamy Panneerselvam, Paola Del Serrone, Giovanni Benelli
Culex quinquefasciatus (Diptera: Culicidae) is a vector of many pathogens and parasites of humans, as well as domestic and wild animals. In urban and semi-urban Asian countries, Cx. quinquefasciatus is a main vector of nematodes causing lymphatic filariasis. In the African region, it vectors the Rift Valley fever virus, while in the USA it transmits West Nile, St. Louis encephalitis and Western equine encephalitis virus. In this study, DNA barcoding was used to explore the genetic variation of Cx. quinquefasciatus populations from 88 geographical regions...
May 2017: Acta Tropica
https://www.readbyqxmd.com/read/28077444/protein-interactions-during-the-flavivirus-and-hepacivirus-life-cycle
#20
Gisa Gerold, Janina Bruening, Bettina Weigel, Thomas Pietschmann
Protein-protein interactions govern biological functions in cells, in the extracellular milieu and at the border between cells and extracellular space. Viruses are small intracellular parasites and thus rely on protein interactions to produce progeny inside host cells and to spread from cell to cell. Usage of host proteins by viruses can have severe consequences e.g. apoptosis, metabolic disequilibria or altered cell proliferation and mobility. Understanding protein interactions during virus infection can thus educate us on viral infection and pathogenesis mechanisms...
January 11, 2017: Molecular & Cellular Proteomics: MCP
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