[header] How to protect yourself from seasonal flu [title] Get the influenza vaccine. [step] Each year, the cdc, world health organization and other public-health groups study the newest strains of influenza and quickly develop effective vaccines to protect people. Cdc officials consider the flu shot to be the most effective barrier against becoming infected. 
The vaccine contains inactive viruses from the 3 strains researchers believe will be most prevalent during the flu season. The cdc encourages everyone to get immunized, particularly people in high-risk groups.