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https://www.readbyqxmd.com/read/29330423/t-cell-immunity-to-zika-virus-targets-immunodominant-epitopes-that-show-cross-reactivity-with-other-flaviviruses
#1
C J Reynolds, O M Suleyman, A M Ortega-Prieto, J K Skelton, P Bonnesoeur, A Blohm, V Carregaro, J S Silva, E A James, B Maillère, M Dorner, R J Boyton, D M Altmann
Zika virus (ZIKV) Infection has several outcomes from asymptomatic exposure to rash, conjunctivitis, Guillain-Barré syndrome or congenital Zika syndrome. Analysis of ZIKV immunity is confounded by the fact that several related Flaviviruses infect humans, including Dengue virus 1-4, West Nile virus and Yellow Fever virus. HLA class II restricted T cell cross-reactivity between ZIKV and other Flaviviruses infection(s) or vaccination may contribute to protection or to enhanced immunopathology. We mapped immunodominant, HLA class II restricted, CD4 epitopes from ZIKV Envelope (Env), and Non-structural (NS) NS1, NS3 and NS5 antigens in HLA class II transgenic mice...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29321308/sustained-specific-and-cross-reactive-t-cell-responses-to-zika-and-dengue-viruses-ns3-in-west-africa
#2
Bobby Brooke Herrera, Wen-Yang Tsai, Charlotte A Chang, Donald J Hamel, Wei-Kung Wang, Yichen Lu, Souleymane Mboup, Phyllis J Kanki
Recent studies on the role of T cells in Zika virus (ZIKV) infection have shown that T cell responses to Asian ZIKV infection are important for protection, and that previous Dengue virus (DENV) exposure amplifies the protective T cell response to Asian ZIKV. Human T cell responses to African ZIKV infection, however, remain unexplored. Here, we utilized the modified anthrax toxin delivery system to develop a flavivirus ELISPOT. Using human ZIKV and DENV samples from Senegal, West Africa, our results demonstrate specific and cross-reactive T cell responses to nonstructural protein 3 (NS3)...
January 10, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29319591/zika-virus-infection-in-the-pregnant-woman
#3
Meghan Holtzman, William C Golden, Jeanne S Sheffield
Zika virus is a single-stranded RNA virus from the Flaviviridae family. Transmission is typically from the bite of an infected mosquito though mother-to-child, sexual and blood donation transmissions can occur. Although maternal symptoms are uncommon and rarely severe, the consequences of congenital infections are devastating. The emergence of congenital Zika syndrome is a world-wide public health crisis. The Centers for Disease Control and Prevention, ACOG, and SMFM have developed algorithms for screening and managing women exposure to and diagnosed with Zika virus infection...
January 9, 2018: Clinical Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29318332/-zika-virus-infection-and-the-nervous-system
#4
REVIEW
I W Husstedt, M Maschke, C Eggers, E Neuen-Jacob, G Arendt
Zika virus is an arbovirus from the family of flaviviruses, which is transmitted by the mosquito Aedes aegyptii and also by the Asian mosquito Aedes albopticus. The largest observed Zika virus epidemic is currently taking place in North and South America, in the Caribbean, southern USA and Southeast Asia. In most cases the infection is an unspecific, acute, febrile disease. Neurological manifestations consist mainly of microcephaly in newborns and Guillain-Barré syndrome but other rare manifestations have also become known in the meantime, such as meningoencephalitis and myelitis...
January 9, 2018: Der Nervenarzt
https://www.readbyqxmd.com/read/29315671/the-antimalarial-drug-amodiaquine-possesses-anti-zika-virus-activities
#5
Yingshan Han, Thibault Mesplède, Hongtao Xu, Yudong Quan, Mark A Wainberg
Zika virus (ZIKV) outbreak has emerged as a global health threat, particularly in tropical areas, over the past few years. No antiviral therapy or vaccine is available at present. For these reasons, repurposing clinically approved drugs against ZIKV infection may provide rapid and cost-effective global health benefits. Here we explored this strategy and screened eight FDA-approved drugs for antiviral activity against ZIKV using a cell-based assay. Our results show that the antimalarial drug amodiaquine has anti-ZIKV activity with EC50 at low micromolar concentrations in cell culture...
January 9, 2018: Journal of Medical Virology
https://www.readbyqxmd.com/read/29301009/arbovirus-diagnostics-from-bad-to-worse-due-to-expanding-dengue-virus-vaccination-and-zika-virus-epidemics
#6
Graham Simmons, Mars Stone, Michael P Busch
No abstract text is available yet for this article.
December 30, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29300166/a-systematic-review-of-zika-virus-hurdles-toward-vaccine-development-and-the-way-forward
#7
Azizul Haque, Faruk Berat Akçeşme, Anudeep B Pant
The Zika virus (ZIKV) epidemic has recently emerged as public health threat due to its teratogenic nature and association with the serious neurological condition Guillain-Barré syndrome (GBS). To date, no approved antiviral therapeutics or vaccines are available to confront ZIKV. In order to develop effective anti-ZIKV vaccines, improved animal models and a better understanding of immunological correlates of protection against ZIKV are required. In this paper, we discuss the recent progress in developing vaccines against ZIKV and the hurdles to overcome in making efficacious anti-Zika vaccines...
January 4, 2018: Antiviral Therapy
https://www.readbyqxmd.com/read/29299939/repurposing-drugs-for-use-against-zika-virus-infection
#8
J Devillers
Zika virus (ZIKV) is a mosquito-borne flavivirus for which there are no vaccines or specific therapeutics. To find drugs active on the virus is a complex, expensive and time-consuming process. The prospect of drug repurposing, which consists of finding new indications for existing drugs, is an interesting alternative to expedite drug development for specific diseases. In theory, drug repurposing is also able to respond much more rapidly to a crisis than a classical drug discovery process. Consequently, the methodology is attractive for vector-borne diseases that can emerge or re-emerge worldwide with the risk to become pandemic quickly...
January 4, 2018: SAR and QSAR in Environmental Research
https://www.readbyqxmd.com/read/29298885/recombinant-chimpanzee-adenovirus-vaccine-adc7-m-e-protects-against-zika-virus-infection-and-testis-damage
#9
Kun Xu, Yufeng Song, Lianpan Dai, Yongli Zhang, Xuancheng Lu, Yijia Xie, Hangjie Zhang, Tao Cheng, Qihui Wang, Qingrui Huang, Yuhai Bi, William J Liu, Wenjun Liu, Xiangdong Li, Chuan Qin, Yi Shi, Jinghua Yan, Dongming Zhou, George F Gao
The recent outbreak of Zika virus (ZIKV) has emerged as a global health concern. ZIKV can persist in human semen and be transmitted by sexual contact, as well as by mosquitos as seen for classical arboviruses. We and others have previously demonstrated that ZIKV infection leads to testis damage and infertility in mouse models. So far, no prophylactics or therapeutics are available, therefore, vaccine development is urgently demanded. Recombinant chimpanzee adenovirus has been explored as the preferred vaccine vector for many pathogens due to the low pre-existing immunity against the vector among the human population...
January 3, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29298700/evidence-for-multiple-insecticide-resistance-in-urban-aedes-albopictus-populations-in-southern-china
#10
Yiji Li, Jiabao Xu, Daibin Zhong, Hong Zhang, Wenqiang Yang, Guofa Zhou, Xinghua Su, Yang Wu, Kun Wu, Songwu Cai, Guiyun Yan, Xiao-Guang Chen
BACKGROUND: Aedes albopictus (Skuse) is an invasive mosquito that has become an important vector of chikungunya, dengue and Zika viruses. In the absence of specific antiviral therapy or a vaccine, vector management is the sole method available for reducing Aedes-induced disease morbidity. Determining the resistance status of Ae. albopictus to insecticides and exploring the resistance mechanisms is essential for future vector control planning. METHODS: Aedes albopictus larvae and pupae were sampled from six sites (two sites each from urban, suburban and rural) in Guangzhou...
January 3, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29282215/the-bright-and-the-dark-side-of-human-antibody-responses-to-flaviviruses-lessons-for-vaccine-design
#11
REVIEW
Félix A Rey, Karin Stiasny, Marie-Christine Vaney, Mariano Dellarole, Franz X Heinz
Zika and dengue viruses belong to the Flavivirus genus, a close group of antigenically related viruses that cause significant arthropod-transmitted diseases throughout the globe. Although infection by a given flavivirus is thought to confer lifelong protection, some of the patient's antibodies cross-react with other flaviviruses without cross-neutralizing. The original antigenic sin phenomenon may amplify such antibodies upon subsequent heterologous flavivirus infection, potentially aggravating disease by antibody-dependent enhancement (ADE)...
December 27, 2017: EMBO Reports
https://www.readbyqxmd.com/read/29280428/african-and-asian-zika-virus-isolates-display-phenotypic-differences-both-in-vitro-and-in-vivo
#12
Darci R Smith, Thomas R Sprague, Bradley S Hollidge, Stephanie M Valdez, Susana L Padilla, Stephanie A Bellanca, Joseph W Golden, Susan R Coyne, David A Kulesh, Lynn Jean Miller, Andrew D Haddow, Jeff W Koehler, Gregory D Gromowski, Richard G Jarman, Maria Theresa P Alera, In-Kyu Yoon, Rome Buathong, Robert G Lowen, Christopher D Kane, Timothy D Minogue, Sina Bavari, Robert B Tesh, Scott C Weaver, Kenneth J Linthicum, Margaret L Pitt, Farooq Nasar
Zika virus (ZIKV) is a mosquito-borne member of the genus Flavivirus that has emerged since 2007 to cause outbreaks in Africa, Asia, Oceania, and most recently, in the Americas. Here, we used an isolate history as well as genetic and phylogenetic analyses to characterize three low-passage isolates representing African (ArD 41525) and Asian (CPC-0740, SV0127-14) lineages to investigate the potential phenotypic differences in vitro and in vivo. The African isolate displayed a large plaque phenotype (∼3-4 mm) on Vero and HEK-293 cells, whereas the Asian isolates either exhibited a small plaque phenotype (∼1-2 mm) or did not produce any plaques...
December 26, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29274845/discovery-of-a-non-nucleoside-rna-polymerase-inhibitor-for-blocking-zika-virus-replication-through-in-silico-screening
#13
Aryamav Pattnaik, Nicholas Palermo, Bikash R Sahoo, Zhe Yuan, Duoyi Hu, Arun S Annamalai, Hiep L X Vu, Ignacio Correas, Pavan Kumar Prathipati, Christopher J Destache, Qingsheng Li, Fernando A Osorio, Asit K Pattnaik, Shi-Hua Xiang
Zika virus (ZIKV), an emerging arbovirus, has become a major human health concern globally due to its association with congenital abnormalities and neurological diseases. Licensed vaccines or antivirals against ZIKV are currently unavailable. Here, by employing a structure-based approach targeting the ZIKV RNA-dependent RNA polymerase (RdRp), we conducted in silico screening of a library of 100,000 small molecules and tested the top ten lead compounds for their ability to inhibit the virus replication in cell-based in vitro assays...
December 21, 2017: Antiviral Research
https://www.readbyqxmd.com/read/29273403/zika-virus-an-emerging-infectious-disease-with-serious-perinatal-and-neurologic-complications
#14
Thomas B Casale, Michael N Teng, Jamie P Morano, Thomas Unnasch, Charles J Lockwood
Zika virus (ZIKV) is a flavivirus that is primarily transmitted by Aedes aegypti, the mosquito vector also important in the transmission of the flaviviruses responsible for dengue fever, yellow fever and chikungunya. Due to occurrence in the same geographic regions, serological cross-reactivity, and similar, albeit often less severe clinical manifestations as dengue and chikungunya infections, ZIKV infection likely went undetected and/or misdiagnosed for many years. ZIKV is somewhat unique among flaviviruses in its ability to also be transmitted via sexual contact, non-sexual body fluids and perinatally...
December 19, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/29251602/controlled-human-infection-models-for-vaccine-development-zika-virus-debate
#15
Vijayaprasad Gopichandran
An ethics panel, convened by the National Institute of Health and other research bodies in the USA, disallowed researchers from the Johns Hopkins University and University of Vermont from performing controlled human infection of healthy volunteers to develop a vaccine against Zika virus infection. The members published their ethical analysis and recommendations in February 2017. They have elaborated on the risks posed by human challenge with Zika virus to the volunteers and other uninvolved third parties and have systematically analysed the social value of such a human challenge experiment...
October 31, 2017: Indian Journal of Medical Ethics
https://www.readbyqxmd.com/read/29243225/review-current-priorities-in-the-zika-response
#16
REVIEW
Danillo Lucas Alves Esposito, Jonathan Ballico de Moraes, Benedito Antonio Lopes da Fonseca
Zika virus (ZIKV), a single-stranded RNA virus of the Flaviviridae family, is an arbovirus (viruses transmitted by arthropods) transmitted to humans and non-human primates through the bites of infected female Aedes sp. mosquitoes. Although first isolated in 1947, only recently it emerged as a global threat, present in several countries resulting in a pandemic scenario. ZIKV infections may result in severe outcomes, such as neurological impairment, and with the intrinsic ability of inducing microcephaly in fetuses of infected pregnant women, the virus has become a major public health problem...
December 15, 2017: Immunology
https://www.readbyqxmd.com/read/29242091/association-between-microcephaly-zika-virus-infection-and-other-risk-factors-in-brazil-final-report-of-a-case-control-study
#17
Thalia Velho Barreto de Araújo, Ricardo Arraes de Alencar Ximenes, Demócrito de Barros Miranda-Filho, Wayner Vieira Souza, Ulisses Ramos Montarroyos, Ana Paula Lopes de Melo, Sandra Valongueiro, Maria de Fátima Pessoa Militão de Albuquerque, Cynthia Braga, Sinval Pinto Brandão Filho, Marli Tenório Cordeiro, Enrique Vazquez, Danielle di Cavalcanti Souza Cruz, Claudio Maierovitch Pessanha Henriques, Luciana Caroline Albuquerque Bezerra, Priscila Mayrelle da Silva Castanha, Rafael Dhalia, Ernesto Torres Azevedo Marques-Júnior, Celina Maria Turchi Martelli, Laura Cunha Rodrigues
BACKGROUND: A Zika virus epidemic emerged in northeast Brazil in 2015 and was followed by a striking increase in congenital microcephaly cases, triggering a declaration of an international public health emergency. This is the final report of the first case-control study evaluating the potential causes of microcephaly: congenital Zika virus infection, vaccines, and larvicides. The published preliminary report suggested a strong association between microcephaly and congenital Zika virus infection...
December 11, 2017: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/29241768/zika-virus-the-transboundary-pathogen-from-mosquito-and-updates
#18
REVIEW
Weili Kong, Hengtao Li, Jian Zhu
Zika virus (ZIKV) is a mosquito-borne flavivirus that was relatively obscure until outbreaks started in 2013. ZIKV is associated with neurological manifestations such as Guillan-Barrè Syndrome in adult and microcephaly in the newborn population. Although the majority of disease mechanisms of ZIKV is unclear, some information was updated with new scientific evidence. Currently, there are no approved drugs or vaccine that can be used for therapy during ZIKV infection. Based on the transmission mechanism of ZIKV, vector control and safe sex seem to be the most effective available preventive measures against ZIKV spread...
December 11, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29237759/durability-and-correlates-of-vaccine-protection-against-zika-virus-in-rhesus-monkeys
#19
Peter Abbink, Rafael A Larocca, Kittipos Visitsunthorn, Michael Boyd, Rafael A De La Barrera, Gregory D Gromowski, Marinela Kirilova, Rebecca Peterson, Zhenfeng Li, Ovini Nanayakkara, Ramya Nityanandam, Noe B Mercado, Erica N Borducchi, Abishek Chandrashekar, David Jetton, Shanell Mojta, Priya Gandhi, Jake LeSuer, Shreeya Khatiwada, Mark G Lewis, Kayvon Modjarrad, Richard G Jarman, Kenneth H Eckels, Stephen J Thomas, Nelson L Michael, Dan H Barouch
An effective Zika virus (ZIKV) vaccine will require long-term durable protection. Several ZIKV vaccine candidates have demonstrated protective efficacy in nonhuman primates, but these studies have typically involved ZIKV challenge shortly after vaccination at peak immunity. We show that a single immunization with an adenovirus vector-based vaccine, as well as two immunizations with a purified inactivated virus vaccine, afforded robust protection against ZIKV challenge in rhesus monkeys at 1 year after vaccination...
December 13, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/29235456/infection-via-mosquito-bite-alters-zika-virus-tissue-tropism-and-replication-kinetics-in-rhesus-macaques
#20
Dawn M Dudley, Christina M Newman, Joseph Lalli, Laurel M Stewart, Michelle R Koenig, Andrea M Weiler, Matthew R Semler, Gabrielle L Barry, Katie R Zarbock, Mariel S Mohns, Meghan E Breitbach, Nancy Schultz-Darken, Eric Peterson, Wendy Newton, Emma L Mohr, Saverio Capuano Iii, Jorge E Osorio, Shelby L O'Connor, David H O'Connor, Thomas C Friedrich, Matthew T Aliota
Mouse and nonhuman primate models now serve as useful platforms to study Zika virus (ZIKV) pathogenesis, candidate therapies, and vaccines, but they rely on needle inoculation of virus: the effects of mosquito-borne infection on disease outcome have not been explored in these models. Here we show that infection via mosquito bite delays ZIKV replication to peak viral loads in rhesus macaques. Importantly, in mosquito-infected animals ZIKV tissue distribution was limited to hemolymphatic tissues, female reproductive tract tissues, kidney, and liver, potentially emulating key features of human ZIKV infections, most of which are characterized by mild or asymptomatic disease...
December 13, 2017: Nature Communications
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