Vaccination

• Vaccination involves injecting a small amount of dead or weaken forms of a pathogens into the body (because pathogen is dead and inactive, it cannot lead to the disease of the patient)

  
• 1 - The white blood cells are now stimulated to produce antibodies against the dead or inactive pathogen
• 2- At the same time the white blood cells divide by mitosis to produce lots of copies of itself

  
• 3 - If the same pathogen enters the body, even years later, the white blood cells can produce the correct antibodies quickly. This prevents infection
• Graph shows the level of antibodies after vaccination and after the body has been invaded by the real pathogen. When the real pathogen invades, the antibody rises very quickly into a very high level and this is due to the vaccination

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