Did you have the flu vaccine this winter? Did you feel a bit under the weather afterwards? What if there was a way to predict how you would respond to a vaccine before it was given to you?
Vaccines work by creating an immune memory without you ever having the disease. By treating you with a killed version or pieces of the pathogen we want to vaccinate against, we trigger a small immune response. This makes memory antibody producing B cells which kick into action when you encounter the real pathogen and stop it from taking hold.