1. World Health O. Pneumonia Fact Sheet. 2022.

2. Wang X, Li Y, Deloria-Knoll M, Madhi SA, Cohen C, Ali A, et al. Global burden of acute lower respiratory infection associated with human metapneumovirus in children under 5 years in 2018: a systematic review and modelling study. Lancet Global Health. 2021;9(1):e33-e43. doi:10.1016/S2214-109X(21)00218-7 PMid:34166626

3. Chen D, Cao L, Li W. Etiological and clinical characteristics of severe pneumonia in pediatric intensive care unit (PICU). BMC Pediatr. 2023; 23(1):362. doi:10.1186/s12887-023-04175-y PMid:37454044 PMCid:PMC10349420

4. Patel N, Ban AS, Gladfelter T, Tripathi S. Epidemiology and outcomes of bacterial coinfection in hospitalized children with respiratory viral infections: a single center retrospective chart review. J Pediatr Pharmacol Ther. 2022;27(6):529-36. doi:10.5863/1551-6776-27.6.529 PMid:36042958 PMCid:PMC9400186

5. Hu Q, Liang W, Yi Q, Zheng Y, Wang W, Wu Y. Risk factors for death associated with severe influenza in children and the impact of the COVID-19 pandemic on clinical characteristics. Front Pediatr. 2023;11:1249058. doi:10.3389/fped.2023.1249058 PMid:37772040 PMCid:PMC10522912

6. Jain S, Williams DJ, Arnold SR, Ampofo K, Bramley AM, Reed C, et al. Community-acquired pneumonia requiring hospitalization among US children. New England J Med. 2015;372(9):835-45. doi:10.1056/NEJMoa1405870 PMid:25714161 PMCid:PMC4697461

7. Yazici Özkaya P, Turanli EE, Metin H, Aydın Uysal A, Çiçek C, Karapinar B. Severe influenza virus infection in children admitted to the PICU: Comparison of influenza A and influenza B virus infection. J Med Virol. 2022;94(2):575-81. doi:10.1002/jmv.27400 PMid:34655235

8. Chauhan RP, Gordon ML. An overview of influenza A virus genes, protein functions, and replication cycle highlighting important updates. Virus Genes. 2022;58(4):255-69. doi:10.1007/s11262-022-01904-w PMid:35471490

9. Wong JJM, Abbas Q, Wang JQY, Xu W, Dang H, Phan PH, et al. Severe Pneumonia in PICU Admissions: The Pediatric Acute and Critical Care Medicine Asian Network (PACCMAN) Observational Cohort Study, 2020-2022. Pediatr Crit Care Med. 2024;25(11):1035-44. doi:10.1097/PCC.0000000000003598 PMid:39177431

10. Nair GB, Niederman MS. Updates on community acquired pneumonia management in the ICU. Pharmacol Ther. 2021;217:107663. doi:10.1016/j.pharmthera.2020.107663 PMid:32805298 PMCid:PMC7428725

11. Kamidani S, Garg S, Rolfes MA, Campbell AP, Cummings CN, Haston JC, et al. Epidemiology, clinical characteristics, and outcomes of influenza-associated hospitalizations in US children over 9 seasons following the 2009 H1N1 pandemic. Clin Infect Dis. 2022; 75(11):1930-9. doi:10.1093/cid/ciac296 PMid:35438769

12. Heininger U, Baer G, Ryser AJ, Li Y. Comparative analysis of clinical characteristics of pandemic influenza A/H1N1 and seasonal influenza A infections in hospitalized children. Pediatr Infect Dis J. 2013;32(3):293-6. doi:10.1097/INF.0b013e318279ce4b PMid:23190773

13. Leung CH, Tseng HK, Wang WS, Chiang HT, Wu AYJ, Liu CP. Clinical characteristics of children and adults hospitalized for influenza virus infection. J Microbiol Immunol Infect. 2014; 47(6):518-25. doi:10.1016/j.jmii.2013.06.002 PMid:23932366

14. Ozsurekci Y, Aykac K, Bal F, Bayhan C, Basaranoglu ST, Alp A, et al. Outcome predictors of influenza for hospitalization and mortality in children. J Med Virol. 2021;93(11):6148-54. doi:10.1002/jmv.26833 PMid:33512015 PMCid:PMC8014286

15. Harper SA, Bradley JS, Englund JA, File TM, Gravenstein S, Hayden FG, et al. Seasonal influenza in adults and children-diagnosis, treatment, chemoprophylaxis, and institutional outbreak management: clinical practice guidelines of the Infectious Diseases Society of America. Clin Infect Dis. 2009:1003-32. doi:10.1086/598513 PMid:19281331

16. Grohskopf LA. Prevention and control of seasonal influenza with vaccines: recommendations of the Advisory Committee on Immunization Practices-United States, 2023-24 influenza season. MMWR Recomm Rep. 2023;72. doi:10.15585/mmwr.rr7202a1 PMCid:PMC10468199

17. Jefferson T, Rivetti A, Harnden A, Di Pietrantonj C, Demicheli V. Vaccines for preventing influenza in healthy children. Cochrane Database Syst Rev. 2008; (2):CD004879. doi:10.1002/14651858.CD004879.pub3 PMID: 18425905

18. Smith S, Demicheli V, Di Pietrantonj C, Harnden AR, Jefferson T, Matheson NJ, et al. Vaccines for preventing influenza in healthy children. Cochrane Database Syst Rev. 2006;1(2):367-522. doi:10.1002/ebch.24