Why does the flu shot not give you the flu?
Quick Answer
The flu shot does not contain live influenza virus that can cause infection in the same way the illness does. Any post-shot symptoms are usually mild immune reactions, not influenza disease.
The Full Story
The standard flu shot is made from inactivated virus, purified proteins, or recombinant components, depending on the product. These cannot cause influenza the way an active viral infection can. Some people feel tired, achy, or mildly feverish after vaccination because their immune system is responding to the vaccine, but this is not the flu. It is also common to catch another virus around the same time and mistakenly blame the shot. Seasonal flu vaccination remains the best way to reduce serious complications from influenza.
Key Facts
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"Why can’t the flu shot give you the flu? Because it’s not the same kind of virus exposure."
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