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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 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. These mild reactions to the flu shot usually only cause a low grade fever under 100F and last only a few days.

However, there is also always the possibility that you actually have the flu, since it takes about two weeks to develop full immunity from an inoculation and if you caught the flu before the vaccination, it could be what is causing a fever. Use careful hand washing technique to protect others in case it is actually the flu and until you have gone 24 hours without a fever.

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Q: Can a fever from a flu shot be contagious?
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