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  1. The immunity developed as a result of antigenic stimulation is called active immunization.
  2. It involves active functioning of the immune system of the host by production of antibodies.
  3. It is more effective than passive immunization.
  4. It develops after sometime and is long lasting.
  5. More effective for protection of the host.
  6. Immunological memory is seen.

It is of two types:

  1. Natural: Develops after first infection by a pathogen. Eg. Individual attacked by chicken pox develops life-long immunity against it.
  2. Artificial: Developed by administration of vaccines. Vaccines are preparation of live or killed micro-organisms or their products.
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