Unlike COVID-19, the flu has a vaccination. Officials are renewing the annual call to encourage healthy individuals to get a flu shot. Even though the flu shot is not a perfect vaccine and offers only 40% to 60% protection from infection, it can provide enormous benefits. 

Is there any link between what you can notice after a vaccine and what’s happening on the cellular level inside your body? Robert Finberg is a physician who specializes in infectious diseases and immunology at the Medical School at the University of Massachusetts. He explains how this perception doesn’t match the reality of how vaccines work.