Flu Shot Facts & Side Effects (Updated for 2018-2019)
By Rachael Rettner, Senior Writer | August 17, 2018 02:25pm ET
The seasonal flu shot is a yearly vaccine administered to protect against the flu, or influenza.
In the United States, flu shots are recommended for everyone ages 6 months and older, according to the Centers for Disease Control and Prevention.
The flu can be a very serious illness, especially in young children, adults ages 65 and over, those with underlying health conditions, and pregnant women.
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