[1] CDC-How Flu Spreads https://www.cdc.gov/flu/spread/
[2] CDC-Flu: What To Do If You Get Sick https://www.cdc.gov/flu/takingcare/index.html
[3] UpToDate临床顾问:预防季节性流感的感染控制措施
[4] CDC-People at Increased Risk for Flu Complications https://www.cdc.gov/flu/highrisk/index.htm
[5] CDC-Preventing Seasonal Flu https://www.cdc.gov/flu/prevention/?CDC_AAref_Val=https://www.cdc.gov/flu/prevent/prevention.htm
[6] WHO-Manual for the laboratory diagnosis and virological surveillance of influenza https://www.who.int/publications/i/item/manual-for-the-laboratory-diagnosis-and-virological-surveillance-of-influenza
[7] Bouvier NM, Palese P. The biology of influenza viruses. Vaccine. 2008 Sep 12;26 Suppl 4(Suppl 4):D49-53. doi: 10.1016/j.vaccine.2008.07.039. PMID: 19230160; PMCID: PMC3074182.