Advocate Children's Hospital
You CANNOT get the sick with the flu from the flu shot – the injection does not even contain the actual flu virus but only has pieces of its outer shell.
It takes your body about 2 weeks to develop the immunity to the flu virus, so you are still able to catch the actual virus in that time.
The flu shot is important for everyone to receive but especially for the very young, very old and those with lung/breathing issues (asthma, recurrent pneumonia, etc.)
Hand washing is still one of the most effective ways of preventing spread of the flu
Absolutely no connection between vaccines and autism
Vaccination against the flu has prevented close to 2 million illnesses, almost 1 million medical visits and over 65,000 hospitalizations during the 2014-2015 season.
Bottom line: everyone who is able to receive the flu vaccine should receive the flu shot prior to the start of the flu season.