How long after vaccination does it take for the flu shot to work?

Question: 

How long after vaccination does it take for the flu shot to work?
 

Answer: 

It takes about two weeks after vaccination for antibodies to develop in the body that protect against influenza (flu) viruses. For best protection, it is recommended that people get vaccinated as soon as the vaccine is available in their community.

For more information about the flu and flu vaccine, visit our influenza page.