The vaccine is recommended every year for children 6 months and older. Kids under 9 who get a flu vaccine for the first time will receive it in two separate doses at least a month apart. Those younger than 9 who have been vaccinated in the past might still need two doses if they have not received at least two flu vaccinations since July 2010.

Kids 6 months to 5 years old are still considered the group of kids who most need the flu vaccine, but updated guidelines from the Centers for Disease Control and Prevention (CDC) now recommend that all older kids and teens get it, too.

It\'s especially important for high-risk kids to be vaccinated. High-risk groups include, but aren\'t limited to, kids younger than 5 years old, and those with chronic medical conditions, such as asthma, heart problems, sickle cell anemia, diabetes, or human immunodeficiency virus (HIV).

It can take up to 2 weeks after the shot is given for the body to build up immunity against the flu.

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