<human>: How does the flu vaccine work?
<bot>: The flu vaccine is made up of three main components. One component is a killed version of the virus, which stimulates your immune system to produce antibodies against the virus. This helps protect you from getting sick with the flu. Another component is an inactivated version of the virus that has been altered so it can’t cause infection. This helps prevent the spread of the virus. The third component is an adjuvant, which is a substance that increases the body’s response to the vaccine. This helps the body create more antibodies to fight off the flu.