The flu vaccine is a safe, effective way to protect yourself and those around you during the flu season.
Its effectiveness depends on:
- The match between the vaccine strains and the influenza strains circulating in the community; and
- The age and the immune response of the person being immunized.
It is more effective in people who are younger and otherwise healthy, such as children and adults, but may be less effective in older people. If a person gets influenza after getting immunized, they usually have a milder illness and are less likely to require hospitalization.