Quote:
Originally Posted by 'Hamas' Jenkins
Pro-tip: It usually takes about two weeks to build up full immunity and the effectiveness of the shot will wane over the course of the season as the virus mutates. You are generally best off getting the shot sometime in October.
Fortunately, all flu shots have been inactivated vaccines for several years now, which means you can't get the flu from the shot, but a mild fever and malaise are not uncommon.
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From my understanding, the sickness that occurs in some people after the flu shot isn't the flu but an allergic reaction to the "wrapper".