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West nile fever

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https://www.readbyqxmd.com/read/28444003/species-abundance-and-temporal-variation-of-arbovirus-vectors-in-brownsville-texas
#1
Krithika Srinivasan, Beatriz Tapia, Arturo Rodriguez, Robert Wood, Jennifer J Salinas
The recent outbreaks of the dengue fever and West Nile viruses and the looming threats of the Zika and chikungunya viruses highlight the importance of establishing effective, proactive arboviral surveillance in communities at high risk of transmission, such as those on the Texas-Mexico border. Currently, there are no approved human vaccines available for these mosquito-borne diseases, so entomological control and case management are the only known methods for decreasing disease incidence. The principal vectors, which include Culex quinquefasciatus, Aedes aegypti, and Ae...
April 20, 2017: Revista Panamericana de Salud Pública, Pan American Journal of Public Health
https://www.readbyqxmd.com/read/28431624/opsoclonus-myoclonus-ataxia-associated-with-west-nile-virus-infection-a-dramatic-presentation-with-benign-prognosis
#2
Roy Zaltzman, Colin Klein, Carlos R Gordon
Opsoclonus myoclonus and ataxia is a combination of severe neurological signs associated with several pathologic agents and conditions. Only few cases of opsoclonus have been related to West Nile virus infection. We report on a 61-year-old woman and on a 55-year-old man who had history of recent fever, who were hospitalized because of acute severe truncal ataxia, opsoclonus and tremor with minimal myoclonic jerks. A through work-up revealed the presence of both IgM and IgG antibodies against West Nile virus both in the serum and Cerebrospinal Fluid and excluded other causes known to be associated with this combination of neurological signs...
May 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28421048/functional-information-stored-in-the-conserved-structural-rna-domains-of-flavivirus-genomes
#3
REVIEW
Alba Fernández-Sanlés, Pablo Ríos-Marco, Cristina Romero-López, Alfredo Berzal-Herranz
The genus Flavivirus comprises a large number of small, positive-sense single-stranded, RNA viruses able to replicate in the cytoplasm of certain arthropod and/or vertebrate host cells. The genus, which has some 70 member species, includes a number of emerging and re-emerging pathogens responsible for outbreaks of human disease around the world, such as the West Nile, dengue, Zika, yellow fever, Japanese encephalitis, St. Louis encephalitis, and tick-borne encephalitis viruses. Like other RNA viruses, flaviviruses have a compact RNA genome that efficiently stores all the information required for the completion of the infectious cycle...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28397519/emerging-vector-borne-diseases-in-dromedaries-in-tunisia-west-nile-bluetongue-epizootic-haemorrhagic-disease-and-rift-valley-fever
#4
Thameur B Hassine, Jihane Amdouni, Federica Monaco, Giovanni Savini, Soufien Sghaier, Imed B Selimen, Walid Chandoul, Khaled B Hamida, Salah Hammami
A total of 118 sera were collected during 2016 from two groups of dromedaries from Kebili and Medenine governorates in the south of Tunisia. The aim of this study was to provide the first serological investigation of four emerging vector-borne diseases in two groups of dromedaries in Tunisia. Sera were tested by ELISA and serum neutralisation test to identify West Nile virus (WNV), bluetongue virus (BTV), epizootic haemorrhagic disease virus (EHDV) and Rift Valley fever virus (RVFV). In the first group, the seroprevalence for BTV was 4...
March 31, 2017: Onderstepoort Journal of Veterinary Research
https://www.readbyqxmd.com/read/28386524/surveillance-of-arthropod-borne-viruses-and-their-vectors-in-the-mediterranean-and-black-sea-regions-within-the-medilabsecure-network
#5
REVIEW
Anna-Bella Failloux, Ali Bouattour, Chafika Faraj, Filiz Gunay, Nabil Haddad, Zoubir Harrat, Elizabeta Jancheska, Khalil Kanani, Mohamed Amin Kenawy, Majlinda Kota, Igor Pajovic, Lusine Paronyan, Dusan Petric, Mhammed Sarih, Samir Sawalha, Taher Shaibi, Kurtesh Sherifi, Tatiana Sulesco, Enkelejda Velo, Lobna Gaayeb, Kathleen Victoir, Vincent Robert
PURPOSE OF REVIEW: Arboviruses, viruses transmitted by arthropods such as mosquitoes, ticks, sandflies, and fleas are a significant threat to public health because of their epidemic and zoonotic potential. The geographical distribution of mosquito-borne diseases such as West Nile (WN), Rift Valley fever (RVF), Dengue, Chikungunya, and Zika has expanded over the last decades. Countries of the Mediterranean and Black Sea regions are not spared. Outbreaks of WN are repeatedly reported in the Mediterranean basin...
2017: Current Tropical Medicine Reports
https://www.readbyqxmd.com/read/28360135/enhancement-of-zika-virus-pathogenesis-by-preexisting-antiflavivirus-immunity
#6
Susana V Bardina, Paul Bunduc, Shashank Tripathi, James Duehr, Justin J Frere, Julia A Brown, Raffael Nachbagauer, Gregory A Foster, David Krysztof, Domenico Tortorella, Susan L Stramer, Adolfo García-Sastre, Florian Krammer, Jean K Lim
Zika virus (ZIKV) is spreading rapidly into regions around the world where other flaviviruses, such as dengue virus (DENV) and West Nile virus (WNV), are endemic. Antibody-dependent enhancement has been implicated in more severe forms of flavivirus disease, but whether this also applies to ZIKV infection is unclear. Using convalescent plasma from DENV- and WNV-infected individuals, we found substantial enhancement of ZIKV infection in vitro that was mediated through immunoglobulin G engagement of Fcγ receptors...
April 14, 2017: Science
https://www.readbyqxmd.com/read/28359829/feeding-behavior-of-mimomyia-etorleptiomyia-luzonensis-ludlow-1905-diptera-culicidae-in-peninsular-malaysia
#7
Kamil A Braima, M Muslimin, Amir-Ridhwan M Ghazali, F Wan-Nor, J J Wilson, J Jeffery, N M Abdul-Aziz
Mosquitoes are vectors of various human diseases in the tropics including yellow fever, dengue, malaria and West Nile virus. Mosquitoes can act as vectors between wildlife and humans, which is particularly important for diseases where wild animals serve as reservoirs of parasites in the absence of human infections. Research has mainly focused on the medical impacts of Anopheles, Aedes, Mansonia and Culex, however, very little attention has been directed towards other mosquito genera, especially those which act as vectors of diseases of wildlife...
March 27, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28358796/yellow-fever-outbreak-kongo-central-province-democratic-republic-of-the-congo-august-2016
#8
John O Otshudiema, Nestor G Ndakala, Elande-Taty K Mawanda, Gaston P Tshapenda, Jacques M Kimfuta, Loupy-Régence N Nsibu, Abdou S Gueye, Jacob Dee, Rossanne M Philen, Coralie Giese, Christopher S Murrill, Ray R Arthur, Benoit I Kebela
On April 23, 2016, the Democratic Republic of the Congo's (DRC's) Ministry of Health declared a yellow fever outbreak. As of May 24, 2016, approximately 90% of suspected yellow fever cases (n = 459) and deaths (45) were reported in a single province, Kongo Central Province, that borders Angola, where a large yellow fever outbreak had begun in December 2015. Two yellow fever mass vaccination campaigns were conducted in Kongo Central Province during May 25-June 7, 2016 and August 17-28, 2016. In June 2016, the DRC Ministry of Health requested assistance from CDC to control the outbreak...
March 31, 2017: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/28332648/west-nile-virus-epizootics-in-the-camargue-france-in-2015-and-reinforcement-of-surveillance-and-control-networks
#9
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
#10
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...
April 1, 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
#11
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
#12
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
#13
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
#14
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-environments-of-flavivirus-endemicity
#15
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 virus (DENV), West Nile virus (WNV), yellow fever virus (YFV), and other viruses of the genus Flavivirus cocirculate. The envelope (E) proteins of these closely related flaviviruses induce 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 nonhuman primates (NHPs)...
April 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28215143/identifying-the-main-mosquito-species-in-the-taiwan-strait-using-dna-barcoding
#16
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
#17
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
#18
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
#19
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
#20
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
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