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https://www.readbyqxmd.com/read/29049285/2009-2010-influenza-a-h1n1-related-critical-illness-among-aboriginal-and-non-aboriginal-canadians
#1
James J Jung, Ruxandra Pinto, Ryan Zarychanski, Deborah J Cook, Philippe Jouvet, John C Marshall, Anand Kumar, Jennifer Long, Rachel Rodin, Robert A Fowler
BACKGROUND: Preliminary studies suggested that Aboriginal Canadians had disproportionately higher rates of infection, hospitalization, and critical illness due to pandemic Influenza A(H1N1)pdm09. METHODS: We used a prospective cohort study of critically ill patients with laboratory confirmed or probable H1N1 infection in Canada between April 16 2009 and April 12 2010. Baseline characteristics, medical interventions, clinical course and outcomes were compared between Aboriginal and non-Aboriginal patients...
2017: PloS One
https://www.readbyqxmd.com/read/29048990/title-site-specific-glycosylation-profile-of-influenza-a-h1n1-hemagglutinin-through-tandem-mass-spectrometry
#2
Esteban Cruz, Joel Cain, Ben Crossett, Veysel Kayser
The study of influenza virus evolution in humans has revealed a significant role of glycosylation profile alterations in the viral glycoproteins - hemagglutinin (HA) and neuraminidase (NA), in the emergence of both seasonal and pandemic strains. Viral antigenic drift can modify the number and location of glycosylation sites, altering a wide range of biological activities and the antigenic properties of the strain. In view of the key role of glycans in determining antigenicity, elucidating the glycosylation profiles of influenza strains is a requirement towards the development of improved vaccines...
October 19, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/29046448/in-vitro-neutralization-is-not-predictive-of-prophylactic-efficacy-of-broadly-neutralizing-monoclonal-antibodies-cr6261-and-cr9114-against-lethal-h2-influenza-virus-challenge-in-mice
#3
Troy C Sutton, Elaine W Lamirande, Kevin W Bock, Ian N Moore, Wouter Koudstaal, Muniza Rehman, Gerrit Jan Weverling, Jaap Goudsmit, Kanta Subbarao
Influenza viruses of the H1N1, H2N2, and H3N2 subtypes have caused previous pandemics. H2 influenza viruses represent a pandemic threat due to continued circulation in wild birds and limited immunity in the human population. In the event of a pandemic, anti-viral agents are the mainstay for treatment, but broadly neutralizing antibodies (bNAbs) may be a viable alternative for short-term prophylaxis or treatment. The hemagglutinin stem binding bNAbs CR6261 and CR9114 have been shown to protect mice from severe disease following challenge with H1N1 and H5N1, and H1N1, H3N2, and influenza B viruses, respectively...
October 18, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29040527/in-and-out-of-hospital-mortality-associated-with-seasonal-and-pandemic-influenza-and-respiratory-syncytial-virus-in-south-africa-2009-2013
#4
Cheryl Cohen, Sibongile Walaza, Florette K Treurnicht, Meredith McMorrow, Shabir A Madhi, Johanna M McAnerney, Stefano Tempia
Background: Estimates of influenza- and respiratory syncytial virus (RSV)-associated mortality burden are important to guide policy for control. Data are limited on the contribution of out-of-hospital deaths to this mortality. Methods: We modeled excess mortality attributable to influenza and RSV infection by applying regression models to weekly deaths from national vital statistics from 2009 through 2013, using influenza and RSV laboratory surveillance data as covariates...
October 10, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29038764/pulmonary-transcriptomic-responses-indicate-a-dual-role-of-inflammation-in-pneumonia-development-and-viral-clearance-during-2009-pandemic-influenza-infection
#5
Raquel Almansa, Pamela Martínez-Orellana, Lucía Rico, Verónica Iglesias, Alicia Ortega, Beatriz Vidaña, Jorge Martínez, Ana Expósito, María Montoya, Jesús F Bermejo-Martin
BACKGROUND: The interaction between influenza virus and the host response to infection clearly plays an important role in determining the outcome of infection. While much is known on the participation of inflammation on the pathogenesis of severe A (H1N1) pandemic 09-influenza virus, its role in the course of non-fatal pneumonia has not been fully addressed. METHODS: A systems biology approach was used to define gene expression profiles, histology and viral dynamics in the lungs of healthy immune-competent mice with pneumonia caused by a human influenza A (H1N1) pdm09 virus, which successfully resolved the infection...
2017: PeerJ
https://www.readbyqxmd.com/read/29035328/pterodontic-acid-isolated-from-laggera-pterodonta-inhibits-viral-replication-and-inflammation-induced-by-influenza-a-virus
#6
Wenda Guan, Jing Li, Qiaolian Chen, Zhihong Jiang, Rongping Zhang, Xinhua Wang, Zifeng Yang, Xiping Pan
Laggera pterodonta (DC.) Benth. is a traditional Chinese medicine. The previous study revealed that the crude extracts of this herb could inhibit influenza virus infection, but its anti-influenza components and underlying mechanism of action remain unknown. Column chromatography was performed to isolate components from the plant. Activity against influenza virus of the compound was determined by CPE inhibition assay. Neuraminidase (NA) inhibition was measured by chemiluminescence assay. The anti-virus and anti-inflammation effects were determined using dual-luciferase reporter assay, immunofluorescence, quantitative real-time PCR and luminex assay...
October 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29034629/-comparison-of-cellular-localization-of-ns1-from-different-subtypes-of-influenza-a-virus
#7
Meng Yu, Shuaishuai Cao, Weinan Zheng, Xiaoxiao Jia, Jing Li, Wenjun Liu
The non-structural (NS1) protein is a multifunctional molecular protein encoded by influenza A virus genome. NS1 plays an important role in inhibition of host immune responses. In order to assess the cellular localization of NS1 in different influenza A virus subtypes, we performed the immunofluorescence assay to observe the cellular location of NS1 after infection with influenza A virus WSN (H1N1), PR8 (H1N1), CA04 (H1N1), SD (H9N2) and AH01 (H7N9) in A549 cells and MDCK cells respectively. According to the results, NS1-WSN and NS1-PR8 accumulated mainly in cytoplasm at 24 h post infection, while the NS1-CA04 and NS1-SD appeared major in the nucleus...
November 25, 2016: Sheng Wu Gong Cheng Xue Bao, Chinese Journal of Biotechnology
https://www.readbyqxmd.com/read/29034325/collection-of-viable-aerosolized-influenza-virus-and-other-respiratory-viruses-in-a-student-health-care-center-through-water-based-condensation-growth
#8
Maohua Pan, Tania S Bonny, Julia Loeb, Xiao Jiang, John A Lednicky, Arantzazu Eiguren-Fernandez, Susanne Hering, Z Hugh Fan, Chang-Yu Wu
The dynamics and significance of aerosol transmission of respiratory viruses are still controversial, for the major reasons that virus aerosols are inefficiently collected by commonly used air samplers and that the collected viruses are inactivated by the collection method. Without knowledge of virus viability, infection risk analyses lack accuracy. This pilot study was performed to (i) determine whether infectious (viable) respiratory viruses in aerosols could be collected from air in a real world environment by the viable virus aerosol sampler (VIVAS), (ii) compare and contrast the efficacy of the standard bioaerosol sampler, the BioSampler, with that of the VIVAS for the collection of airborne viruses in a real world environment, and (iii) gain insights for the use of the VIVAS for respiratory virus sampling...
September 2017: MSphere
https://www.readbyqxmd.com/read/29034093/sentinel-surveillance-of-influenza-like-illness-in-the-central-african-republic-2010-2015
#9
Alexandre Manirakiza, Marie-Yvette Batoumbou Ketta, Ulrich Vickos, Giscard Francis Komoyo, Sandra Garba-Ouangole, Colette Bangue, Edgar Djimbele, Ombretta Pasotti, Eugene Kanga, Eloi Nicaise Mboufoungou, Brice Martial Yambiyo, Kathleen Victoir, Jean-Chrysostome Gody, Mirdad Kazanji, Emmanuel Nakoune
BACKGROUND: Influenza-like illness (ILI) is an important public health problem worldwide. In the Central African Republic, acute infectious diseases are the commonest reason for consultation. The Institut Pasteur of Bangui set up a surveillance network in 2008 to monitor the circulation of influenza viruses. We report the results of use of this surveillance system during the period 2010-2015. METHODS: The first surveillance centre covered Bangui, the capital of the country, and neighbouring areas and epidemiological data on syndromes similar to ILI...
2017: Archives of Public Health, Archives Belges de Santé Publique
https://www.readbyqxmd.com/read/29032772/influenza-vaccination-status-and-outcomes-among-influenza-associated-hospitalizations-in-columbus-ohio-2012-2015
#10
P N Zivich, L Tatham, K Lung, J Tien, C E Bollinger, J K Bower
Prior studies suggest that the influenza vaccine is protective against some outcomes in hospitalized patients infected with influenza despite vaccination. We utilized surveillance data from Columbus, Ohio to investigate this association over multiple influenza seasons and age groups. Data on laboratory-confirmed influenza-associated hospitalizations were collected as a part of the Influenza Hospitalization Surveillance Project for the 2012-2013, 2013-2014, and 2014-2015 influenza seasons. The association between influenza vaccination status was examined in relation to the outcomes of severe influenza and diagnosis of pneumonia among patients receiving antiviral treatment...
October 16, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/29032206/divalent-copper-complexes-as-influenza-a-m2-inhibitors
#11
Nathan A Gordon, Kelly L McGuire, Spencer K Wallentine, Gregory A Mohl, Jonathan D Lynch, Roger G Harrison, David D Busath
New M2 blockers effective against the ubiquitous amantadine-resistant S31N M2 mutation in influenza A are needed. Six copper complexes, 2, 4, 6, 8, 9, and 10, were synthesized and found to block both wild type and S31N M2. Free Cu(2+) also blocks M2 S31N but not S31N/H37A. The copper complexes do not block M2 H37A (either S31 or S31N). The complexes were effective against three influenza A strains in cell-culture assays, but less toxic to cells than CuCl2. For example 4, Cu(cyclooctylamineiminodiacetate), which was stable at pH > 4 in the buffers used, had an EC50 against A/Calif/07/2009 H1N1 of 0...
October 12, 2017: Antiviral Research
https://www.readbyqxmd.com/read/29031867/influenza-is-more-common-than-middle-east-respiratory-syndrome-coronavirus-mers-cov-among-hospitalized-adult-saudi-patients
#12
Jaffar A Al-Tawfiq, Ali A Rabaan, Kareem Hinedi
BACKGROUND: Since the initial description of Middle East Respiratory Syndrome Coronavirus (MERS-CoV), we adopted a systematic process of screening admitted patients with community acquired pneumonia. Here, we report the result of the surveillance activity in a general hospital in Saudi Arabia over a four year period. MATERIALS AND METHODS: All admitted patients with community acquired pneumonia from 2012 to 2016 were tested for MERS-CoV. In addition, testing for influenza viruses was carried out starting April 2015...
October 12, 2017: Travel Medicine and Infectious Disease
https://www.readbyqxmd.com/read/29031546/influenza-virus-but-not-mers-coronavirus-circulation-in-iran-2013-2016-comparison-between-pilgrims-and-general-population
#13
Jila Yavarian, Nazanin Zahra Shafiei Jandaghi, Maryam Naseri, Peyman Hemmati, Mohhamadnasr Dadras, Mohammad Mehdi Gouya, Talat Mokhtari Azad
BACKGROUND: The pilgrimage to Mecca and Karbala bring many Muslims to a confined area. Respiratory tract infections are the most common diseases transmitted during mass gatherings in Hajj, Umrah and Karbala. The aim of this study was to determine and compare the prevalence of Middle East respiratory syndrome coronavirus (MERS-CoV) and influenza virus infections among Iranian general population and pilgrims with severe acute respiratory infections (SARI) returning from Mecca and Karbala during 2013-2016...
October 11, 2017: Travel Medicine and Infectious Disease
https://www.readbyqxmd.com/read/29030070/a-latex-agglutination-assay-to-quantify-the-amount-of-hemagglutinin-protein-in-adjuvanted-low-dose-influenza-monovalent-vaccines
#14
Sophie Buffin, Nabila Ikhelef, Julien Prudent, Joseline Dubayle, Nolwenn Nougarede, Marie-Pierre Varenne, Catherine Moste, Isabelle Legastelois
To formulate inactivated influenza vaccines, the concentration of hemagglutinin (HA) must be accurately determined. The standard test currently used to measure HA in influenza vaccines is the Single Radial Immunodiffusion (SRID) assay. We developed a very rapid, simple and sensitive alternative quantitative HA assay, namely the Latex Agglutination Assay (LAA). The LAA uses the Spherotest(®) technology, which is based on the agglutination of HA-specific immunoglobulin-coated latex beads. The amount of HA in a sample is calculated from the level of bead agglutination by a simple absorbance measurement at 405nm against a standard curve generated using a monovalent vaccine standard...
October 10, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/29029940/antibody-dependent-phagocytosis-adp-responses-following-trivalent-inactivated-influenza-vaccination-of-younger-and-older-adults
#15
Fernanda Ana-Sosa-Batiz, Angus P R Johnston, P Mark Hogarth, Bruce D Wines, Ian Barr, Adam K Wheatley, Stephen J Kent
Globally the most commonly utilised immunisation against influenza is the trivalent inactivated influenza vaccine (TIV) derived from an A/H1N1, an A/H3N2 and aB type influenza virus. Vaccine effectiveness of TIV varies year to year, depending on how well antigenically matched the strains in the vaccine are compared to circulating strains [1,2]. Moreover, vaccine effectiveness can vary within certain subpopulations such as HIV-positive, young children and the elderly. Decreased vaccine effectiveness in the elderly is associated with impaired Ab production, as measured by standard hemagglutination inhibition (HAI) assays...
October 10, 2017: Vaccine
https://www.readbyqxmd.com/read/29029166/beyond-antigenic-match-possible-agent-host-and-immuno-epidemiological-influences-on-influenza-vaccine-effectiveness-during-the-2015-16-season-in-canada
#16
Danuta M Skowronski, Catharine Chambers, Suzana Sabaiduc, Gaston De Serres, Anne-Luise Winter, James A Dickinson, Jonathan B Gubbay, Steven J Drews, Christine Martineau, Hugues Charest, Mel Krajden, Nathalie Bastien, Yan Li
Background: Vaccine effectiveness (VE) estimates are reported from Canada's Sentinel Practitioner Surveillance Network (SPSN) for the 2015-16 influenza season, characterized by a delayed A(H1N1)pdm09 epidemic and concurrent B(Victoria) activity. Potential influences beyond antigenic match are explored including viral genomic variation, birth cohort effects, prior vaccination and epidemic period. Methods: VE was estimated by test-negative design comparing adjusted-odds ratio for influenza test-positivity among vaccinated vs...
October 4, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29029064/2015-2016-vaccine-effectiveness-of-live-attenuated-and-inactivated-influenza-vaccines-in-children-in-the-united-states
#17
Katherine A Poehling, Herve Caspard, Timothy R Peters, Edward A Belongia, Blaise Congeni, Manjusha Gaglani, Marie R Griffin, Stephanie A Irving, Poornima K Kavathekar, Huong Q McLean, Allison L Naleway, Kathleen Ryan, H Keipp Talbot, Christopher S Ambrose
Background: In the 2015-2016 season, quadrivalent live attenuated influenza vaccine (LAIV) and both trivalent and quadrivalent inactivated influenza vaccine (IIV) were available in the United States. Methods: This study, conducted according to a test-negative case-control design, enrolled children aged 2-17 years presenting to outpatient settings with fever and respiratory symptoms for <5 days at 8 sites across the United States between November 30, 2015 and April 15, 2016...
October 4, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29028950/epidemiology-and-relative-severity-of-influenza-subtypes-in-singapore-in-the-post-pandemic-period-from-2009-to-2010
#18
Ee Hui Goh, Lili Jiang, Jung Pu Hsu, Linda Wei Lin Tan, Wei Yen Lim, Meng Chee Phoon, Yee Sin Leo, Ian G Barr, Vincent Tak Kwong Chow, Vernon J Lee, Cui Lin, Raymond Lin, Sapna P Sadarangani, Barnaby Young, Mark I-Cheng Chen
Background: After 2009, pandemic influenza A(H1N1) [A(H1N1)pdm09] cocirculated with A(H3N2) and B in Singapore. Methods: A cohort of 760 participants contributed demographic data and up to 4 blood samples each from October 2009 to September 2010. We compared epidemiology of the 3 subtypes and investigated evidence for heterotypic immunity through multivariable logistic regression using a generalized estimating equation. To examine age-related differences in severity between subtypes, we used LOESS (locally weighted smoothing) plots of hospitalization to infection ratios and explored birth cohort effects referencing the pandemic years (1957; 1968)...
September 23, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29027752/label-free-multiplex-dna-detection-utilizing-projected-capacitive-touchscreen
#19
Joon Young Lee, Byoung Yeon Won, Hyun Gyu Park
We have developed a novel strategy to achieve label-free multiplex DNA detection system based on the projected capacitive touchscreen. Touchscreen panel was first fabricated by patterning the ITO (indium-tin-oxide) electrode array on the glass wafer, and the electrodes were modified with the respective capture probe DNA sequences complementary to hemagglutinin1 (H1), neuraminidase1 (N1), and matrix1 (M1) DNA to demonstrate the molecular diagnosis of H1N1 influenza virus as a model pathogen. DNA sample was then applied to the electrodes to allow hybridization of target DNA with the corresponding complementary capture probe...
October 13, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/29024996/encephalitis-after-influenza-and-vaccination-a-nationwide-population-based-registry-study-from-norway
#20
Sara Ghaderi, Ketil Størdal, Nina Gunnes, Inger J Bakken, Per Magnus, Siri E Håberg
Background: Influenza is known to be associated with various neurological complications, including encephalitis. We conducted a registry-based study to assess the risk of encephalitis after influenza and A(H1N1)pdm09 vaccine. Methods: Data from Norwegian national health registries during 2008-14 were linked using the unique personal identifiers given to all Norwegian residents ( N  = 5 210 519). Cox proportional-hazard models with time-varying variables were fitted to estimate hazard ratios (HRs) of encephalitis after influenza and A(H1N1)pdm09 vaccine, using the risk windows 0-7, 0-14, 0-30, 0-60, 0-90 and 0-180 days...
July 27, 2017: International Journal of Epidemiology
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