Cards (9)

  • immunity is the ability of an organism to resist infection
  • passive immunity is produced by the introduction of antibodies into individuals from an outside source
  • passive immunity:
    1. direct contact with the pathogen isn't necessary
    2. immunity is acquired immediately
    3. immunity doesn't last
  • active immunity is produced by stimulating the production of antibodies by the individuals own immune system
  • active immunity:
    1. direct contact with the pathogen is necessary
    2. immunity takes time to be acquired
    3. immunity does last
  • two types of active immunity:
    1. natural active immunity
    2. artificial active immunity
  • natural active immunity results from an individual becoming infected with a disease under normal circumstances and produces its own antibodies
  • artificial active immunity involves inducing an immune response without the individual suffering the symptoms of the disease
  • herd immunity arises with a sufficiently large proportion of the population has been vaccinated to make it difficult for a pathogen to spread