Why do I need a flu shot every year?

The seasonal influenza vaccine consists of three or four different strains of influenza, depending on the manufacturer. Each year scientists from the World Health Organization, Centers for Disease Control, and the Food and Drug Administration determine which strains will make up the seasonal flu shot based on the dominating strains the year before.

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1. What is influenza?
2. How is influenza spread?
3. How do I stop the spread of influenza?
4. What is the Gloucester County Department of Health doing to protect the residents of Gloucester County?
5. What is a Pandemic?
6. Why do I need a flu shot every year?