Outside of the everyday preventative measures seniors can take against the flu, such as washing their hands regularly, sanitizing commonly-touched items around the home, and avoiding close contact with people experiencing flu symptoms, the flu vaccine is a helpful option for flu prevention for seniors.
The flu vaccine has antigens that essentially act as a catalyst to stimulate the production of antibodies in the body to help attack the flu virus should a senior come into contact with it. Simply put, the vaccine helps make the soldiers that fight off the flu virus.