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Yellow fever virus

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https://www.readbyqxmd.com/read/28623054/detection-of-yellow-fever-virus-genomes-from-four-imported-cases-in-china
#1
Shujuan Cui, Yang Pan, Yanning Lyu, Zhichao Liang, Jie Li, Yulan Sun, Xiangfeng Dou, Lili Tian, Da Huo, Lijuan Chen, Xinyu Li, Quanyi Wang
Yellow fever virus (YFV), as the first proven human-pathogenic virus, is still a major public health problem with a dramatic upsurge in recent years. This is a report on four imported cases of yellow fever virus into China identified by whole genome sequencing. Phylogenetic analysis was performed and the results showed that these four viruses were highly homologous with Angola 71 strains (AY968064). In addition, effective mutations of amino acids were not observed in the E protein domain of four viruses, thus confirming the effectiveness of the YFV-17D vaccine (X03700)...
June 13, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28591405/genome-analysis-of-yellow-fever-virus-of-the-ongoing-outbreak-in-brazil-reveals-polymorphisms
#2
Myrna C Bonaldo, Mariela Martínez Gómez, Alexandre Ac Dos Santos, Filipe Vieira Santos de Abreu, Anielly Ferreira-de-Brito, Rafaella Moraes de Miranda, Marcia Gonçalves de Castro, Ricardo Lourenço-de-Oliveira
The current yellow fever outbreak in Brazil is the most severe one in the country in recent times. It has rapidly spread to areas where YF virus (YFV) activity has not been observed for more than 70 years and vaccine coverage is almost null. Here, we sequenced the whole YFV genome of two naturally infected howler-monkeys (Alouatta clamitans) obtained from the Municipality of Domingos Martins, state of Espírito Santo, Brazil. These two ongoing-outbreak genome sequences are identical. They clustered in the 1E sub-clade (South America genotype I) along with the Brazilian and Venezuelan strains recently characterised from infections in humans and non-human primates that have been described in the last 20 years...
June 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/28577343/de-novo-rna-synthesis-catalyzed-by-the-zika-virus-rna-polymerase-domain
#3
Christina Calmels, Michel Ventura, Cindy Aknin, Mathieu Métifiot, Marie-Line Andreola
Mosquito- and tick-borne pathogens including Chikungunya, Dengue, Japanese encephalitis, West Nile, Yellow fever and Zika virus, represent a new economic and public health challenge. In the absence of effective vaccines and specific therapies, only supportive regimens are administrated for most of these infections. Thus, the development of a targeted therapy is mandatory to stop the rapid progression of these pathogens and preoccupant associated burdens such as Guillain-Barre syndrome, microcephaly. For this, it is essential to develop biochemical tools to help study and target key viral enzymes involved in replication such as helicase complexes, methyl-transferases and RNA-dependent RNA polymerases...
June 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28574621/prospects-for-induction-of-cd8-t-cell-mediated-immunity-to-zika-virus-infection-by-yellow-fever-virus-yfv-vaccination
#4
Kim Blom, John Tyler Sandberg, Karin Loré, Hans-Gustaf Ljunggren
The Zika virus epidemic represents an unprecedented health crisis affecting significant parts of the world (1) . On February 1(st) 2016, the WHO declared the reported clusters of Zika-virus induced microcephaly and other neurological disorders a Public Health Emergency of International Concern (PHEIC). The epidemic is currently ongoing in Latin America and the Caribbean, with impacts of the infection already seen in large populations of Brazil, Colombia, Mexico, Peru and beyond. No specific treatment or vaccine is available, although several candidates are under development (2) ...
June 2, 2017: Journal of Internal Medicine
https://www.readbyqxmd.com/read/28562637/identification-of-diagnostic-peptide-regions-that-distinguish-zika-virus-from-related-mosquito-borne-flaviviruses
#5
Alexandra J Lee, Roshni Bhattacharya, Richard H Scheuermann, Brett E Pickett
Zika virus (ZIKV) is a member of the Flavivirus genus of positive-sense single-stranded RNA viruses, which includes Dengue, West Nile, Yellow Fever, and other mosquito-borne arboviruses. Infection by ZIKV can be difficult to distinguish from infection by other mosquito-borne Flaviviruses due to high sequence similarity, serum antibody cross-reactivity, and virus co-circulation in endemic areas. Indeed, existing serological methods are not able to consistently differentiate ZIKV from other Flaviviruses, which makes it extremely difficult to accurately calculate the incidence rate of Zika-associated Guillain-Barre in adults, microcephaly in newborns, or asymptomatic infections within a geographical area...
2017: PloS One
https://www.readbyqxmd.com/read/28562615/screening-test-for-neutralizing-antibodies-against-yellow-fever-virus-based-on-a-flavivirus-pseudotype
#6
Séverine Mercier-Delarue, Christine Durier, Nathalie Colin de Verdière, Jean-Dominique Poveda, Vincent Meiffrédy, Maria Dolores Fernandez Garcia, Stéphane Lastère, Raymond Césaire, Jean-Claude Manuggera, Jean-Michel Molina, Ali Amara, François Simon
Given the possibility of yellow fever virus reintroduction in epidemiologically receptive geographic areas, the risk of vaccine supply disruption is a serious issue. New strategies to reduce the doses of injected vaccines should be evaluated very carefully in terms of immunogenicity. The plaque reduction test for the determination of neutralizing antibodies (PRNT) is particularly time-consuming and requires the use of a confinement laboratory. We have developed a new test based on the use of a non-infectious pseudovirus (WN/YF17D)...
2017: PloS One
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/28553618/effective-protection-induced-by-a-monovalent-dna-vaccine-against-dengue-virus-dv-serotype-1-and-a-bivalent-dna-vaccine-against-dv1-and-dv2-in-mice
#8
Xiaoyan Zheng, Hui Chen, Ran Wang, Dongying Fan, Kaihao Feng, Na Gao, Jing An
Dengue virus (DV) is the causal pathogen of dengue fever, which is one of the most rapidly spread mosquito-borne disease worldwide and has become a severe public health problem. Currently, there is no specific treatment for dengue; thus, a vaccine would be an effective countermeasure to reduce the morbidity and mortality. Although, the chimeric Yellow fever dengue tetravalent vaccine has been approved in some countries, it is still necessary to develop safer, more effective, and less costly vaccines. In this study, a DNA vaccine candidate pVAX1-D1ME expressing the prME protein of DV1 was inoculated in BALB/c mice via intramuscular injection or electroporation, and the immunogenicity and protection were evaluated...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28553020/zika-virus-can-india-win-the-fight
#9
Tulika Singh
Zika virus is an emerging arbovirus of public health importance transmitted by Aedes mosquito which also transmits dengue, chikungunya and yellow fever. The disease has been spreading at an alarming rate in Africa, Pacific Islands, and the Americas. Given the expansion of environments where mosquitoes can live and breed, facilitated by urbanization and globalization, there is potential for major urban epidemics of Zika virus disease to occur globally. World Health Organization (WHO) has declared Zika virus disease to be a Public Health Emergency of International Concern (PHEIC)...
April 2017: Indian Journal of Community Medicine
https://www.readbyqxmd.com/read/28542603/a-conformational-switch-high-throughput-screening-assay-and-allosteric-inhibition-of-the-flavivirus-ns2b-ns3-protease
#10
Matthew Brecher, Zhong Li, Binbin Liu, Jing Zhang, Cheri A Koetzner, Adham Alifarag, Susan A Jones, Qishan Lin, Laura D Kramer, Hongmin Li
The flavivirus genome encodes a single polyprotein precursor requiring multiple cleavages by host and viral proteases in order to produce the individual proteins that constitute an infectious virion. Previous studies have revealed that the NS2B cofactor of the viral NS2B-NS3 heterocomplex protease displays a conformational dynamic between active and inactive states. Here, we developed a conformational switch assay based on split luciferase complementation (SLC) to monitor the conformational change of NS2B and to characterize candidate allosteric inhibitors...
May 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28542240/wmel-limits-zika-and-chikungunya-virus-infection-in-a-singapore-wolbachia-introgressed-ae-aegypti-strain-wmel-sg
#11
Cheong Huat Tan, PeiSze Jeslyn Wong, Meizhi Irene Li, HuiTing Yang, Lee Ching Ng, Scott Leslie O'Neill
BACKGROUND: Zika (ZIKV) and Chikungunya (CHIKV) viruses are emerging Aedes-borne viruses that are spreading outside their known geographic range and causing wide-scale epidemics. It has been reported that these viruses can be transmitted efficiently by Ae. aegypti. Recent studies have shown that Ae. aegypti when transinfected with certain Wolbachia strains shows a reduced replication and dissemination of dengue (DENV), Chikungunya (CHIKV), and Yellow Fever (YFV) viruses. The aim of this study was to determine whether the wMel strain of Wolbachia introgressed onto a Singapore Ae...
May 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28514646/heparin-removal-by-ecteola-cellulose-pre-treatment-enables-the-use-of-plasma-samples-for-accurate-measurement-of-anti-yellow-fever-virus-neutralizing-antibodies
#12
Ana Carolina Campi-Azevedo, Vanessa Peruhype-Magalhães, Jordana Grazziela Coelho-Dos-Reis, Christiane Costa-Pereira, Anna Yoshida Yamamura, Sheila Maria Barbosa de Lima, Marisol Simões, Fernanda Freire Campos Nunes, Aline de Castro Zacche Tonini, Elenice Moreira Lemos, Ricardo Cristiano Brum, Tatiana Guimarães de Noronha, Marcos da Silva Freire, Maria de Lourdes Sousa Maia, Luiz Antônio Bastos Camacho, Maria Rios, Caren Chancey, Alessandro Romano, Carla Magda Domingues, Andréa Teixeira-Carvalho, Olindo Assis Martins-Filho
Technological innovations in vaccinology have recently contributed to bring about novel insights for the vaccine-induced immune response. While the current protocols that use peripheral blood samples may provide abundant data, a range of distinct components of whole blood samples are required and the different anticoagulant systems employed may impair some properties of the biological sample and interfere with functional assays. Although the interference of heparin in functional assays for viral neutralizing antibodies such as the functional plaque-reduction neutralization test (PRNT), considered the gold-standard method to assess and monitor the protective immunity induced by the Yellow fever virus (YFV) vaccine, has been well characterized, the development of pre-analytical treatments is still required for the establishment of optimized protocols...
May 14, 2017: Journal of Immunological Methods
https://www.readbyqxmd.com/read/28509947/-arboviruses-also-have-an-american-dream
#13
F Rodhain
Some arboviruses that originated in the Old World have been introduced by humans into the American continent. The first of them was the yellow fever virus, coming from the West African coast with slaves in the 17th-19th centuries, followed by dengue viruses, which were always prevalent within the Americas. Next was theWest Nile virus, introduced in New York in 1999, that spread in only a few years over the whole continent. Then, Chikungunya virus arrived on Saint Martin Island in 2013 after its outbreak in Polynesia; it is now widespread in the Caribbean Islands and on the American continent from the United States to Brazil...
May 16, 2017: Bulletin de la Société de Pathologie Exotique
https://www.readbyqxmd.com/read/28506254/reemergence-of-yellow-fever-in-ethiopia-after-50%C3%A2-years-2013-epidemiological-and-entomological-investigations
#14
Abrham Lilay, Negga Asamene, Abyot Bekele, Mesfin Mengesha, Milliyon Wendabeku, Israel Tareke, Abiy Girmay, Yonas Wuletaw, Abate Adossa, Yamar Ba, Amadou Sall, Daddi Jima, Debritu Mengesha
BACKGROUND: Yellow Fever (YF) is a viral hemorrhagic disease transmitted by aedes mosquito species. Approximately, 200,000 cases and 30,000 deaths occur worldwide every year. In Ethiopia, the last outbreak was reported in 1966 with 2200 cases and 450 deaths. A number of cases with deaths from unknown febrile illness reported from South Ari district starting from November 2012. This investigation was conducted to identify the causative agent, source of the outbreak and recommend appropriate interventions...
May 15, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28506240/inhibitors-compounds-of-the-flavivirus-replication-process
#15
REVIEW
Leidy L García, Leonardo Padilla, Jhon C Castaño
Flaviviruses are small viruses with single-stranded RNA, which include the yellow fever virus, dengue virus, West Nile virus, Japanese encephalitis virus, tick-borne encephalitis virus, and Zika virus; and are causal agents of the most important emerging diseases that have no available treatment to date. In recent years, the strategy has focused on the development of replication inhibitors of these viruses designed to act mainly by affecting the activity of enzyme proteins, such as NS3 and NS5, which perform important functions in the viral replication process...
May 15, 2017: Virology Journal
https://www.readbyqxmd.com/read/28502235/molecular-analysis-and-genetic-diversity-of-aedes-albopictus-diptera-culicidae-from-china
#16
Zhang Ruiling, Leng Peien, Wang Xuejun, Zhang Zhong
Aedes albopictus is one of the most invasive species, which can carry Dengue virus, Yellow fever virus and more than twenty arboviruses. Based on mitochondrial gene cytochrome c oxidase I (COI) and samples collected from 17 populations, we investigated the molecular character and genetic diversity of Ae. albopictus from China. Altogether, 25 haplotypes were detected, including 10 shared haplotypes and 15 private haplotypes. H1 was the dominant haplotype, which is widely distributed in 13 populations. Tajima'D value of most populations was significantly negative, demonstrating that populations experienced rapid range expansion recently...
May 13, 2017: Mitochondrial DNA. Part A. DNA Mapping, Sequencing, and Analysis
https://www.readbyqxmd.com/read/28499872/interaction-of-flavivirus-with-their-mosquito-vectors-and-their-impact-on-the-human-health-in-the-americas
#17
Anayansi Valderrama, Yamilka Diaz, Sandra López-Vergès
Some of the major arboviruses with public health importance, such as dengue, yellow fever, Zika and West Nile virus are mosquito-borne or mosquito-transmitted Flavivirus. Their principal vectors are from the family Culicidae, Aedes aegypti and Aedes albopictus being responsible of the urban cycles of dengue, Zika and yellow fever virus. These vectors are highly competent for transmission of many arboviruses. The genetic variability of the vectors, the environment and the viral diversity modulate the vector competence, in this context, it is important to determine which vector species is responsible of an outbreak in areas where many vectors coexist...
May 9, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28492447/the-yellow-fever-vaccine-misadventure-of-1942
#18
John S Marr, John T Cathey
In 1942, a hepatitis B outbreak occurred in the US Army after vaccination with contaminated lots of 17D yellow fever vaccine; long-term sequelae were surprisingly limited, and retrospective studies of carrier rates, cirrhosis, and hepatocellular carcinoma were found to be minimal. Later studies identified the contaminant as hepatitis B virus (HBV) in the human serum component of the vaccine. Other than 2 follow-up studies of long-term sequelae and reports within US Military archives, the event has never been fully elucidated in its proper historical context in the medical literature available through MEDLINE (PubMed)...
May 10, 2017: Journal of Public Health Management and Practice: JPHMP
https://www.readbyqxmd.com/read/28480154/congenital-tracheobronchomegaly-mounier-kuhn-syndrome-in-a-woman-with-human-immunodeficiency-virus-a-case-report
#19
Amanda Fletcher, Justin Stowell, Socrates Jamoulis
Congenital tracheobronchomegaly (Mounier-Kuhn Syndrome, MKS) is a rare idiopathic disorder characterized by dilation of the central airways, including the trachea and first through fourth order bronchi. MKS disproportionately affects men and results in chronic respiratory tract infections. The diagnosis is made through the synthesis of clinical and radiological data. Here we report a unique case of MKS in a patient with human immunodeficiency virus (HIV) infection. A 45-year-old African American woman with a past medical history of HIV, tobacco and recreational drug abuse, chronic obstructive pulmonary disease, sleep apnea, and a 15-year history of recurrent respiratory infections presented with dyspnea, wheezing, a productive cough, increased yellow-green sputum production, and subjective fevers...
April 4, 2017: Curēus
https://www.readbyqxmd.com/read/28472971/larvicidal-activity-of-lignans-and-alkaloid-identified-in-zanthoxylum-piperitum-bark-toward-insecticide-susceptible-and-wild-culex-pipiens-pallens-and-aedes-aegypti
#20
Soon-Il Kim, Young-Joon Ahn
BACKGROUND: The yellow fever mosquito, Aedes aegypti, and the common house mosquito, Culex pipiens pallens, transmit dengue fever and West Nile virus diseases, respectively. This study was conducted to determine the toxicity of the three lignans (-)-asarinin, sesamin and (+)-xanthoxylol-γ,γ-dimethylallylether (XDA), and the alkaloid pellitorine from Zanthoxylum piperitum (Rutaceae) bark to third-instar larvae from insecticide-susceptible C. pipiens pallens and Ae. aegypti as well as wild C...
May 4, 2017: Parasites & Vectors
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