1. Centers for Disease Control and Prevention. Disease burden of flu. https://www.cdc.gov/flu/about/burden/index.html. Accessed 19 May 2022.
2. World Health Organization. Global influenza programme. Burden of disease. https://www.who.int/teams/global-influenza-programme/surveillance-and-monitoring/burden-of-disease. Accessed 2 June 2022.
3. Gaitonde DY, Moore FC, Morgan MK. Influenza: diagnosis and treatment. Am Fam Phys. 2019;100:751–8.
4. Krammer F, Smith GJD, Fouchier RAM, et al. Influenza. Nat Rev Dis Primers. 2018;4:3.
5. Taubenberger JK, Morens DM. Influenza: The once and future pandemic. Public Health Rep. 2010;125(Suppl 3):16–26.