Vaccination

• A dead or inactive pathogen in injected into the body
• Once inside the body, the pathogen is recognised by WBCs which produce antibodies which stick to the pathogen
• Pathogens with antibodies bound to them will stick together until another WBC comes and engulfs them
• If the same pathogen enters the body again, WBCs will rapidly mass produce the antibodies needed to kill the pathogen
• A pathogen is 'remembered' by memory cells which makes a person immune to a disease