Vaccination

• The vaccine is made containing dead or weakened form of the pathogen then it is injected into the body
• White blood cells have antibodies which are specific to antigens on the pathogen
• White blood cells form memory cells so they can remember how to produce these antibodies when the same pathogen enters the body
• On the second exposure antibodies are present. The white blood cells produce antibodies more quickly and more specific. so the pathogen are destroyed before you feel any symptom. The person is immune
• Vaccines work by introducing an antigen that mimics the disease causing organism, but does not cause illness itself.