Relative effectiveness of high-dose versus standard-dose influenza vaccine against hospitalizations and mortality according to Charlson Comorbidity Index: A post-hoc analysis of the DANFLU-1 randomized trial.

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Title: Relative effectiveness of high-dose versus standard-dose influenza vaccine against hospitalizations and mortality according to Charlson Comorbidity Index: A post-hoc analysis of the DANFLU-1 randomized trial.
Authors: Bernholm KF; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark., Johansen ND; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark., Espersen C; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark., Modin D; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark., Hyldekær KJ; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark., Nealon J; Sanofi, Lyon, France., Samson S; Sanofi, Lyon, France., Loiacono MM; Sanofi, PA, Swiftwater, USA., Harris RC; Sanofi, Singapore., Larsen CS; Department of Clinical Medicine, Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark., Jensen AMR; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark., Landler NE; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark., Nielsen ST; Department of Intensive Care, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark., Russell L; Department of Intensive Care, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark., Itenov TS; Department of Anaesthesia and Intensive Care, Copenhagen University Hospital - Bispebjerg and Frederiksberg, Copenhagen, Denmark., Claggett BL; Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA., Solomon SD; Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA., Landray MJ; Clinical Trial Service Unit and Epidemiological Studies Unit, Nuffield Department of Population Health, University of Oxford, Oxford, UK., Gislason GH; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; The Danish Heart Foundation, Copenhagen, Denmark.; The National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark., Køber L; Department of Cardiology, Copenhagen University Hospital - Rigshospitalet , Copenhagen, Denmark., Sivapalan P; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Copenhagen Respiratory Research, Department of Medicine, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark., Jensen JUS; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Copenhagen Respiratory Research, Department of Medicine, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark., Biering-Sørensen T; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark. tor.biering@gmail.com.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark. tor.biering@gmail.com.; Steno Diabetes Center Copenhagen, Copenhagen, Denmark. tor.biering@gmail.com.
Source: European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology [Eur J Clin Microbiol Infect Dis] 2026 May; Vol. 45 (5), pp. 1323-1332. Date of Electronic Publication: 2026 Jan 29.
Publication Type: Journal Article; Pragmatic Clinical Trial; Randomized Controlled Trial
Journal Info: Publisher: Springer Country of Publication: Germany NLM ID: 8804297 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1435-4373 (Electronic) Linking ISSN: 09349723 NLM ISO Abbreviation: Eur J Clin Microbiol Infect Dis Subsets: MEDLINE
Database: MEDLINE Ultimate
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  Data: Relative effectiveness of high-dose versus standard-dose influenza vaccine against hospitalizations and mortality according to Charlson Comorbidity Index: A post-hoc analysis of the DANFLU-1 randomized trial.
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  Data: <searchLink fieldCode="AU" term="%22Bernholm+KF%22">Bernholm KF</searchLink>; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark.<br /><searchLink fieldCode="AU" term="%22Johansen+ND%22">Johansen ND</searchLink>; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark.<br /><searchLink fieldCode="AU" term="%22Espersen+C%22">Espersen C</searchLink>; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark.<br /><searchLink fieldCode="AU" term="%22Modin+D%22">Modin D</searchLink>; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark.<br /><searchLink fieldCode="AU" term="%22Hyldekær+KJ%22">Hyldekær KJ</searchLink>; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark.<br /><searchLink fieldCode="AU" term="%22Nealon+J%22">Nealon J</searchLink>; Sanofi, Lyon, France.<br /><searchLink fieldCode="AU" term="%22Samson+S%22">Samson S</searchLink>; Sanofi, Lyon, France.<br /><searchLink fieldCode="AU" term="%22Loiacono+MM%22">Loiacono MM</searchLink>; Sanofi, PA, Swiftwater, USA.<br /><searchLink fieldCode="AU" term="%22Harris+RC%22">Harris RC</searchLink>; Sanofi, Singapore.<br /><searchLink fieldCode="AU" term="%22Larsen+CS%22">Larsen CS</searchLink>; Department of Clinical Medicine, Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark.<br /><searchLink fieldCode="AU" term="%22Jensen+AMR%22">Jensen AMR</searchLink>; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark.<br /><searchLink fieldCode="AU" term="%22Landler+NE%22">Landler NE</searchLink>; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark.<br /><searchLink fieldCode="AU" term="%22Nielsen+ST%22">Nielsen ST</searchLink>; Department of Intensive Care, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark.<br /><searchLink fieldCode="AU" term="%22Russell+L%22">Russell L</searchLink>; Department of Intensive Care, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark.<br /><searchLink fieldCode="AU" term="%22Itenov+TS%22">Itenov TS</searchLink>; Department of Anaesthesia and Intensive Care, Copenhagen University Hospital - Bispebjerg and Frederiksberg, Copenhagen, Denmark.<br /><searchLink fieldCode="AU" term="%22Claggett+BL%22">Claggett BL</searchLink>; Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.<br /><searchLink fieldCode="AU" term="%22Solomon+SD%22">Solomon SD</searchLink>; Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.<br /><searchLink fieldCode="AU" term="%22Landray+MJ%22">Landray MJ</searchLink>; Clinical Trial Service Unit and Epidemiological Studies Unit, Nuffield Department of Population Health, University of Oxford, Oxford, UK.<br /><searchLink fieldCode="AU" term="%22Gislason+GH%22">Gislason GH</searchLink>; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; The Danish Heart Foundation, Copenhagen, Denmark.; The National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark.<br /><searchLink fieldCode="AU" term="%22Køber+L%22">Køber L</searchLink>; Department of Cardiology, Copenhagen University Hospital - Rigshospitalet , Copenhagen, Denmark.<br /><searchLink fieldCode="AU" term="%22Sivapalan+P%22">Sivapalan P</searchLink>; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Copenhagen Respiratory Research, Department of Medicine, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark.<br /><searchLink fieldCode="AU" term="%22Jensen+JUS%22">Jensen JUS</searchLink>; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Copenhagen Respiratory Research, Department of Medicine, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark.<br /><searchLink fieldCode="AU" term="%22Biering-Sørensen+T%22">Biering-Sørensen T</searchLink>; Center for Translational Cardiology and Pragmatic Randomized Trials, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark. tor.biering@gmail.com.; Cardiovascular Non-Invasive Imaging Research Laboratory, Department of Cardiology, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark. tor.biering@gmail.com.; Steno Diabetes Center Copenhagen, Copenhagen, Denmark. tor.biering@gmail.com.
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