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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.
Influenza (Flu) The flu is an infectious disease that causes symptoms such as fever, cough, sore throat, headache, muscle aches, and chills. The annual flu vaccine can prevent most of the circulating influenza strains. Read about flu symptoms, and learn more about the flu shotÂ».