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https://www.readbyqxmd.com/read/28718801/from-variation-of-influenza-viral-proteins-to-vaccine-development
#1
REVIEW
Wandi Zhu, Chao Wang, Bao-Zhong Wang
Recurrent influenza epidemics and occasional pandemics are one of the most important global public health concerns and are major causes of human morbidity and mortality. Influenza viruses can evolve through antigen drift and shift to overcome the barriers of human immunity, leading to host adaption and transmission. Mechanisms underlying this viral evolution are gradually being elucidated. Vaccination is an effective method for the prevention of influenza virus infection. However, the emergence of novel viruses, including the 2009 pandemic influenza A (H1N1), the avian influenza A virus (H7N9), and the highly pathogenic avian influenza A virus (HPAI H5N1), that have infected human populations frequently in recent years reveals the tremendous challenges to the current influenza vaccine strategy...
July 18, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28718786/egg-independent-influenza-vaccines-and-vaccine-candidates
#2
REVIEW
Ilaria Manini, Claudia Maria Trombetta, Giacomo Lazzeri, Teresa Pozzi, Stefania Rossi, Emanuele Montomoli
Vaccination remains the principal way to control seasonal infections and is the most effective method of reducing influenza-associated morbidity and mortality. Since the 1940s, the main method of producing influenza vaccines has been an egg-based production process. However, in the event of a pandemic, this method has a significant limitation, as the time lag from strain isolation to final dose formulation and validation is six months. Indeed, production in eggs is a relatively slow process and production yields are both unpredictable and highly variable from strain to strain...
July 18, 2017: Vaccines
https://www.readbyqxmd.com/read/28717324/investigation-of-avian-influenza-infection-in-wild-birds-in-ismailia-and-damietta-cities-egypt
#3
Hanaa Mohamed Fadel, Rabab Afifi
AIM: This study was carried out to monitor avian influenza (AI) infection in wild birds in Egypt. MATERIALS AND METHODS: A total of 135 wild birds were examined for the presence of H5, H7, and H9 hemagglutination inhibition antibodies. Organs and swab samples of 75 birds were screened by multiplex real-time reverse transcriptase-polymerase chain reaction (RRT-PCR) to detect AI subtypes H5, H7, and H9 matrix genes. RESULTS: The highest seropositive result was recorded in cattle egrets (90...
June 2017: Veterinary World
https://www.readbyqxmd.com/read/28715468/heterosubtypic-cross-reactivity-of-ha1-antibodies-to-influenza-a-with-emphasis-on-nonhuman-subtypes-h5n1-h7n7-h9n2
#4
Dennis E Te Beest, Erwin de Bruin, Sandra Imholz, Marion Koopmans, Michiel van Boven
Epidemics of influenza A vary greatly in size and age distribution of cases, and this variation is attributed to varying levels of pre-existing immunity. Recent studies have shown that antibody-mediated immune responses are more cross-reactive than previously believed, and shape patterns of humoral immunity to influenza A viruses over long periods. Here we quantify antibody responses to the hemagglutinin subunit 1 (HA1) across a range of subtypes using protein microarray analysis of cross-sectional serological surveys carried out in the Netherlands before and after the A/2009 (H1N1) pandemic...
2017: PloS One
https://www.readbyqxmd.com/read/28715152/demographic-and-ecological-risk-factors-for-human-influenza-a-virus-infections-in-rural-indonesia
#5
Elisabeth Dowling Root, Dwi Agustian, Cissy Kartasasmita, Timothy M Uyeki, Eric A F Simões
BACKGROUND: Indonesia has the world's highest reported mortality for human infections with highly pathogenic avian influenza (HPAI) A(H5N1) virus. Indonesia is an agriculturally-driven country where human-animal mixing is common and provides a unique environment for zoonotic influenza A virus transmission. OBJECTIVES: To identify potential demographic and ecological risk factors for human infection with seasonal influenza A viruses in rural Indonesia, a population-based study was conducted in Cileunyi and Soreang sub-districts near Bandung in western Java from 2008 to 2011...
July 17, 2017: Influenza and Other Respiratory Viruses
https://www.readbyqxmd.com/read/28715148/lineage-specific-epitope-profiles-for-hpai-h5-pre-pandemic-vaccine-selection-and-evaluation
#6
Xueting Qiu, Venkata R Duvvuri, Jonathan B Gubbay, Richard Webby, Ghazi Kayali, Justin Bahl
BACKGROUND: Multiple highly pathogenic avian influenza (HPAI) H5 viruses continue to co-circulate. This has complicated pandemic preparedness and confounded effective vaccine candidate selection and evaluation. OBJECTIVES: In this study we aim to predict and map the diversity of CD8+ T-cell epitopes among H5 Hemagglutinin (HA) gene lineages to estimate CD8+ T-cell immunity in humans induced by vaccine candidates. METHODS: A dataset consisting of 1125 H5 HA sequences collected between 1996 and 2017 from avian and humans was assembled for phylogenetic and lineage-specific epitope analyses...
July 17, 2017: Influenza and Other Respiratory Viruses
https://www.readbyqxmd.com/read/28714923/heterologous-humoral-response-against-h5n1-h7n3-and-h9n2-avian-influenza-viruses-after-seasonal-vaccination-in-a-european-elderly-population
#7
Ivan Sanz, Silvia Rojo, Sonia Tamames, José María Eiros, Raúl Ortiz de Lejarazu
Avian influenza viruses are currently one of the main threats to human health in the world. Although there are some screening reports of antibodies against these viruses in humans from Western countries, most of these types of studies are conducted in poultry and market workers of Asian populations. The presence of antibodies against avian influenza viruses was evaluated in an elderly European population. An experimental study was conducted, including pre- and post-vaccine serum samples obtained from 174 elderly people vaccinated with seasonal influenza vaccines of 2006-2007, 2008-2009, 2009-2010, and 2010-2011 Northern Hemisphere vaccine campaigns...
July 17, 2017: Vaccines
https://www.readbyqxmd.com/read/28714909/the-interplay-between-the-host-receptor-and-influenza-virus-hemagglutinin-and-neuraminidase
#8
REVIEW
Lauren Byrd-Leotis, Richard D Cummings, David A Steinhauer
The hemagglutinin (HA) and neuraminidase (NA) glycoproteins of influenza A virus are responsible for the surface interactions of the virion with the host. Entry of the virus is mediated by functions of the HA: binding to cellular receptors and facilitating fusion of the virion membrane with the endosomal membrane. The HA structure contains receptor binding sites in the globular membrane distal head domains of the trimer, and the fusion machinery resides in the stem region. These sites have specific characteristics associated with subtype and host, and the differences often define species barriers...
July 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28710829/spatiotemporal-evolutionary-epidemiology-of-h5n1-highly-pathogenic-avian-influenza-in-west-africa-and-nigeria-2006-2015
#9
P S Ekong, N M Fountain-Jones, M A Alkhamis
H5N1 highly pathogenic avian influenza virus (HPAIV) was first observed in Nigeria in early 2006 and has now spread to more than 17 African countries having severe economic and public health implications. Here, we explore the spatiotemporal patterns of viral dispersal both among West African countries and within Nigeria using sequence data from hemagglutinin (HA) gene region of the virus. Analyses were performed within a statistical Bayesian framework using phylodynamic models on data sets comprising of all publically available HA sequence data collected from seven West African countries and Egypt between 2006 and 2015...
July 14, 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/28709557/a-bivalent-live-attenuated-influenza-vaccine-for-the-control-and-prevention-of-h3n8-and-h3n2-canine-influenza-viruses
#10
Laura Rodriguez, Aitor Nogales, Pablo R Murcia, Colin R Parrish, Luis Martínez-Sobrido
Canine influenza viruses (CIVs) cause a contagious respiratory disease in dogs. CIV subtypes include H3N8, which originated from the transfer of H3N8 equine influenza virus (EIV) to dogs; and the H3N2, which is an avian-origin virus adapted to infect dogs. Only inactivated influenza vaccines (IIVs) are currently available against the different CIV subtypes. However, the efficacy of these CIV IIVs is not optimal and improved vaccines are necessary for the efficient prevention of disease caused by CIVs in dogs...
July 11, 2017: Vaccine
https://www.readbyqxmd.com/read/28701401/evaluation-of-the-biological-properties-and-cross-reactive-antibody-response-to-h10-influenza-viruses-in-ferrets
#11
Troy C Sutton, Elaine W Lamirande, Rita Czako, Kanta Subbarao
The recent outbreak of avian origin H10N7 influenza among seals in Northern Europe, and two fatal human infections with an avian H10N8 virus in China, have demonstrated that H10 viruses can spread between mammals and cause severe disease in humans. To gain insight into the potential for H10 viruses to cross the species barrier and identify a candidate vaccine strain, we evaluated the in vitro and in vivo properties and antibody response in ferrets to 20 diverse H10 viruses. H10 virus infection of ferrets caused variable weight loss and all 20 viruses replicated throughout the respiratory tract; however, replication in the lungs was highly variable...
July 12, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28694323/a-single-mutation-in-taiwanese-h6n1-influenza-hemagglutinin-switches-binding-to-human-type-receptors
#12
Robert P de Vries, Netanel Tzarum, Wenjie Peng, Andrew J Thompson, Iresha N Ambepitiya Wickramasinghe, Alba T Torrents de la Pena, Marielle J van Breemen, Kim M Bouwman, Xueyong Zhu, Ryan McBride, Wenli Yu, Rogier W Sanders, Monique H Verheije, Ian A Wilson, James C Paulson
In June 2013, the first case of human infection with an avian H6N1 virus was reported in a Taiwanese woman. Although this was a single non-fatal case, the virus continues to circulate in Taiwanese poultry. As with any emerging avian virus that infects humans, there is concern that acquisition of human-type receptor specificity could enable transmission in the human population. Despite mutations in the receptor-binding pocket of the human H6N1 isolate, it has retained avian-type (NeuAcα2-3Gal) receptor specificity...
July 10, 2017: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/28693091/-etiology-characteristics-analysis-of-the-first-input-human-infection-of-avian-influenza-h7n9-in-tianjin
#13
X Y Li, X Y Li, M Kong, W W Xu, L R Guo, M Zou, X Su, X C Dong, P H Zhou
No abstract text is available yet for this article.
July 6, 2017: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/28692924/experimental-co-infection-of-infectious-bronchitis-and-low-pathogenic-avian-influenza-h9n2-viruses-in-commercial-broiler-chickens
#14
Kareem E Hassan, Ahmed Ali, Salama A S Shany, Magdy F El-Kady
In this study, commercial broilers were experimentally infected with single (classical IBV, variant IBV or AIV-H9N2) or mixed AIV-H9N2 with classical, variant or vaccine strains of IBV. Birds were monitored for clinical and pathological outcomes and virus shedding for 10days post infection (DPI). Clinical signs were limited to the respiratory tract in all challenged groups and varied from mild to moderate mouth breathing to severe respiratory signs with snorting sound and extended head. Mortalities were only recorded in mixed AIV-H9N2/variant IBV challenge group...
June 30, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28692316/h7n9-avian-influenza-a-virus-in-china-a-short-report-on-its-circulation-drug-resistant-mutants-and-novel-antiviral-drugs
#15
Juergen A Richt, Li Zejun, Bao Danqi, Liu Qinfang
The first human H7N9 avian influenza virus case was reported in Shanghai in 2013. Shortly thereafter, this virus spread to other regions in China. Molecular analysis indicated that the H7N9 virus is a reassortant virus containing internal genes from the H9N2 virus and previously described mammalian adaption markers, which could allow the virus to adapt efficiently to a mammalian host. Fortunately, there is no evidence of sustained person-to-person spread. Most of the human H7N9 cases have a history of exposure to live poultry markets (LPMs)...
July 10, 2017: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/28690868/mirna-200c-3p-is-crucial-in-acute-respiratory-distress-syndrome
#16
Qiang Liu, Jianchao Du, Xuezhong Yu, Jun Xu, Fengming Huang, Xiaoyun Li, Cong Zhang, Xiao Li, Jiahui Chang, Daozhen Shang, Yan Zhao, Mingyao Tian, Huijun Lu, Jiantao Xu, Chang Li, Huadong Zhu, Ningyi Jin, Chengyu Jiang
Influenza infection and pneumonia are known to cause much of their mortality by inducing acute respiratory distress syndrome (ARDS), which is the most severe form of acute lung injury (ALI). Angiotensin-converting enzyme 2 (ACE2), which is a negative regulator of angiotensin II in the renin-angiotensin system, has been reported to have a crucial role in ALI. Downregulation of ACE2 is always associated with the ALI or ARDS induced by avian influenza virus, severe acute respiratory syndrome-coronavirus, respiratory syncytial virus and sepsis...
2017: Cell Discovery
https://www.readbyqxmd.com/read/28690288/genetic-characterization-of-an-h2n2-influenza-virus-isolated-from-a-muskrat-in-western-siberia
#17
Marina Gulyaeva, Kirill Sharshov, Mizuho Suzuki, Ivan Sobolev, Yoshihiro Sakoda, Alexander Alekseev, Mariya Sivay, Lidia Shestopalova, Michael Shchelkanov, Alexander Shestopalov
Thirty-two muskrats (Ondatra zibethicus) were captured for surveillance of avian influenza virus in wild waterfowl and mammals near Lake Chany, Western Siberia, Russia. A/muskrat/Russia/63/2014 (H2N2) was isolated from an apparently healthy muskrat using chicken embryos. Based on phylogenetic analysis, the hemagglutinin and neuraminidase genes of this isolate were classified into the Eurasian avian-like influenza virus clade and closely related to low pathogenic avian influenza viruses (LPAIVs) isolated from wild water birds in Italy and Sweden, respectively...
July 10, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28688767/the-activation-of-b-cells-enhances-dc-sign-expression-and-promotes-susceptibility-of-b-cells-to-hpai-h5n1-infection
#18
Prasit Na-Ek, Jutarat Thewsoongnoen, Maytawan Thanunchai, Suwimon Wiboon-Ut, Noppadol Sa-Ard-Iam, Rangsini Mahanonda, Arunee Thitithanyanont
The interplay between highly pathogenic avian influenza (HPAI) H5N1 virus and immune cells has been extensively studied for years, as host immune components are thought to play significant roles in promoting the systemic spread of the virus and in the induction of cytokine storm. Previous studies suggested that the interaction of B cells and monocytes could promote HPAI H5N1 infection by enhancing avian influenza virus receptor expression. In this study, we further investigate the relationship between the HPAI H5N1 virus, activated B cells, and DC-SIGN expression...
July 5, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28688454/reassortment-process-after-co-infection-of-pigs-with-avian-h1n1-and-swine-h3n2-influenza-viruses
#19
Kinga Urbaniak, Iwona Markowska-Daniel, Andrzej Kowalczyk, Krzysztof Kwit, Małgorzata Pomorska-Mól, Barbara Frącek, Zygmunt Pejsak
BACKGROUND: The influenza A virus is highly variable, which, to some degree, is caused by the reassortment of viral genetic material. This process plays a major role in the generation of novel influenza virus strains that can emerge in a new host population. Due to the susceptibility of pigs to infections with avian, swine and human influenza viruses, they are considered intermediate hosts for the adaptation of the avian influenza virus to humans. In order to test the reassortment process in pigs, they were co-infected with H3N2 A/swine/Gent/172/2008 (Gent/08) and H1N1 A/duck/Italy/1447/2005 (Italy/05) and co-housed with a group of naïve piglets...
July 8, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28688206/absence-of-clinical-disease-and-contact-transmission-of-north-american-clade-2-3-4-4-h5nx-hpai-in-experimentally-infected-pigs
#20
Bryan S Kaplan, Mia Kim Torchetti, Kelly M Lager, Richard J Webby, Amy L Vincent
BACKGROUND: In the fall of 2014, clade 2.3.4.4 highly pathogenic avian influenza (HPAI) subtype H5N8 was introduced into North America by migrating waterfowl from Asia where, through reassortment, novel HPAI H5N2 and H5N1 viruses emerged. OBJECTIVES: Assess the susceptibility of pigs to North American HPAI clade 2.3.4.4 H5N1, H5N2, and H5N8. METHODS: Pigs and trachea explants were inoculated with a representative panel of clade 2.3.4.4 HPAI viruses from North America...
July 8, 2017: Influenza and Other Respiratory Viruses
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