From WebMD:
Flu Myth #3: The flu vaccine can give you the flu.
This is the flu myth most likely to drive experts bonkers. There is simply no way that the flu vaccine can give you the flu, says Hay. Its impossible.
Why? For one, injected flu vaccines only contain dead virus, and a dead virus is, well, dead: it cant infect you. There is one type of live virus flu vaccine, the nasal vaccine, FluMist. But in this case, the virus is specially engineered to remove the parts of the virus that make people sick.
Despite the scientific impossibility of getting the flu from the flu vaccines, this widespread flu myth wont die. Experts suspect two reasons for its persistence. One, people mistake the side effects of the vaccine for flu. While side effects to the vaccine these days tend to be a sore arm, in the past, side effects often felt like mild symptoms of the flu. Two, flu season coincides with a time of year when bugs causing colds and other respiratory illnesses are in the air. Many people get the vaccine and then, within a few days, get sick with an unrelated cold virus. However, they blame the innocent flu vaccine, rather than their co-worker with a runny nose and cough.
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