4.3.1.7 vaccination

• What does vaccination involve?

  introducing small quantities of dead or inactive forms of a pathogen into the body to stimulate the white blood cells to produce antibodies
• how do vaccinations work after introducing the forms of the pathogen?

  If the same pathogen re-enters the body the white blood cells respond quickly to produce the correct antibodies, preventing infection
• What do vaccines allow?

  Protection against specific diseases
• what does the level of protection a vaccine gives depend on and why?

  the amount of people who are vaccinated because of herd immunity
• Why do we still have diseases?

  The pathogen mutates and becomes antibiotic resistant
• what are the two types of immunity?

  passive and active
• how can active immunity be triggered?

  either naturally or artificially