Flu shot side: Effects. The flu shot has inactivated virus- so it won't infect you with the flu. If you have reactions to the shot they usually resolve within one to two days. Side effects can include a low grade fever, aches ; pain, and localized swelling, redness and pain at the shot site. Some people have had allergic reactions to the flu vaccine. You can let your OB dr know but it's likely normal side effect.
Answered 6/10/2014
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