Learn how the flu spreads and what you can do to avoid it. Reviewed 10/31/2023 Sources Centers for Disease Control and Prevention. "Healthy Habits to Help Protect Against Flu." https://www.cdc.gov/flu/prevent/actions-prevent-flu.htm. Centers for Disease Control and Prevention. "How Flu Spreads." https://www.cdc.gov/flu/about/disease/spread.htm. Related stories