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Mauad T, Hajjar LA, Callegari GD, et al. Lung pathology in fatal novel human influenza A (H1N1) infection. Am J Respir Crit Care Med 181: 72-79, 2010.","DOI":"10.1164\/rccm.200909-1420OC"},{"key":"2","doi-asserted-by":"crossref","unstructured":"2. Ishida T, Seki M, Oishi K, et al. Clinical manifestations of adult patients requiring influenza-associated hospitalization: A prospective multicenter cohort study in Japan via internet surveillance. J Infect Chemother 27: 480-485, 2021.","DOI":"10.1016\/j.jiac.2020.10.021"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. Ishida T, Seki M, Oishi K, et al. Clinical manifestations of hospitalized influenza patients without risk factors: A prospective multicenter cohort study in Japan via internet surveillance. J Infect Chemother 28: 853-858, 2022.","DOI":"10.1016\/j.jiac.2022.02.001"},{"key":"4","unstructured":"4. Japan Institute for Health Security. Influenza 2023-2024 season in Japan. IASR 45: 179-181, 2024. 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The JRS guideline for the management of pneumonia in adults 2024. Respir Investig 63: 811-828, 2024.","DOI":"10.1016\/j.resinv.2025.06.014"},{"key":"10","doi-asserted-by":"crossref","unstructured":"10. Glezen WP, Greenberg S, Atmar RL, Piedra PA, Couch RB. Impact of respiratory virus infections on persons with chronic underlying conditions. JAMA 283: 499-505, 2000.","DOI":"10.1001\/jama.283.4.499"},{"key":"11","doi-asserted-by":"crossref","unstructured":"11. Uyeki TM, Bernstein HH, Bradley JS, et al. Clinical Practice Guidelines by the Infectious Diseases Society of America: 2018 Update on Diagnosis, Treatment, Chemoprophylaxis, and Institutional Outbreak Management of Seasonal Influenzaa. Clinical Infect Dis 68: 895-902, 2019.","DOI":"10.1093\/cid\/ciy874"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Seki M. Strategies for geriatric pneumonia in healthcare facilities -How effective is combined influenza and pneumococcal vaccination? Int J Gen Med 13: 663-666, 2020.","DOI":"10.2147\/IJGM.S264835"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13. Bosaeed M, Kumar D. Seasonal influenza vaccine in immunocompromised persons. Hum Vaccin Immunother 14: 1311-1322, 2018.","DOI":"10.1080\/21645515.2018.1445446"},{"key":"14","unstructured":"14. Frutos AM, Price AM, Harker E, et al; CDC Influenza Vaccine Effectiveness Collaborators. Interim estimates of 2023-24 seasonal influenza vaccine effectiveness - United States. MMWR Morb Mortal Wkly Rep 73: 168-174, 2024."},{"key":"15","unstructured":"15. The Japanese Association for Infectious Diseases. Guidelines and Key Points Regarding Influenza Vaccination for the 2025-26 Season. The Japanese Association for Infectious Diseases Website [Internet]. 2025 [cited 2026 Jun 14]. Available from: https:\/\/www.kansensho.or.jp\/uploads\/files\/guidelines\/influenza_2501003.pdf"},{"key":"16","unstructured":"16. The Japanese Association for Infectious Diseases. Guidelines on Pneumococcal Vaccination for Adults Aged 65 and Older (7th Edition: Key Revisions as of September 30, 2025). The Japanese Association for Infectious Diseases website [Internet]. 2025 [cited 2026 Jun 14]. Available from: https:\/\/www.kansensho.or.jp\/uploads\/files\/guidelines\/o65haienV\/ohaienV_251027.pdf"},{"key":"17","doi-asserted-by":"crossref","unstructured":"17. Seki M, Kohno S, Newstead MW, et al. Critical role of IL-1 receptor-associated kinase-M in regulating chemokine-dependent deleterious inflammation in murine influenza pneumonia. J Immunol 184: 1410-1418, 2010.","DOI":"10.4049\/jimmunol.0901709"},{"key":"18","doi-asserted-by":"crossref","unstructured":"18. Seki M, Kosai K, Yanagihara K, et al. Disease severity in patients with simultaneous influenza and bacterial pneumonia. Intern Med 46: 953-958, 2017.","DOI":"10.2169\/internalmedicine.46.6364"},{"key":"19","doi-asserted-by":"crossref","unstructured":"19. Seki M, Yanagihara K, Higashiyama Y, et al. 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