Final answer:
The CDC recommends a yearly flu vaccine as the most important step in protecting against influenza and its potentially serious complications.
Step-by-step explanation:
The CDC recommends a yearly flu vaccine as the most important step in protecting against influenza and its potentially serious complications. The flu vaccine is recommended for everyone who is at least 6 months of age. It is especially important for people who are at high risk of developing serious complications if they get sick with the flu. This includes people with certain medical conditions, pregnant women, young children, and elderly individuals. Getting an annual flu shot is an effective way to prevent the flu and its complications.