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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.
If you had a flu vaccination and soon or immediately after getting it you had a mild fever and other mild flu symptoms caused by the vaccination, then the fever you have would â¦ not be due to contagious disease but, rather, due to the immune response that the vaccination caused in your body (which is how the shots give us immunity) and it would not be from infectious disease or the flu.