Human: I've been told that I have to get a flu shot every year. Why? Assistant: 
You’re probably being advised to get the flu shot because you are at risk of getting the flu. The flu shot is designed to protect you from the influenza virus, which causes the flu. The flu shot contains inactivated (dead) viruses that are meant to mimic the natural infection. It is recommended that everyone over 6 months old get the flu vaccine each year, as it can help reduce your chances of catching the flu and spreading it to others.