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Mild Flu Shot Reactions. Mild Flu shot reactions include soreness, redness or swelling where the shot was given, hoarseness; sore, red or itchy eyes; cough, fever, and aches. A reaction to Flu vaccine continue they usually begin soon after the shot and last 1-2 days. Severe Flu Shot Reactions. Severe Flu shot reactions include allergic reactions. CDC says however that a life-threatening reaction to Flu vaccine is very rare. If Flu shot reactions occur, it is usually within a few minutes to a few hours after the vaccine.
While the authorities were quick to reassure the public that such side effects of the flu shot are ârareâ the truth is seizures following flu shots are more common than many think. According to the CDCâs own studies, one out of every 2,000 to 3,000 children vaccinated will experience additional fever-related seizures as a result of their vaccination.