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In this 2017 photo, captured inside a clinical setting, a health care provider was placing a bandage on the injection site of a child, who had just received a seasonal influenza vaccine. Children younger than 5-years-old, and especially those younger than 2-years-old, are at high risk of developing serious flu-related complications. A flu vaccine offers the best defense against flu, and its potentially serious consequences, and can also reduce the spread of flu to others.