# Immunization and vaccination

Immunization may be active (introduction of a vaccine) or passive (introduction of immunoglobulin/antibodies).  A *vaccine* is a substance that can induce active immunity. *Vaccination*, by definition, is the introduction of a vaccine, and is, therefore, synonymous with active immunization. Some descriptions include the word *vaccination*, where it is clear that vaccination is intended. Other descriptions have preferred terms with the word *vaccination*, and synonyms with the word *immunization*, to include both active and passive immunization.

* For example,
  * 38598009 |Measles-mumps-rubella vaccination (procedure)| has *vaccination* in all descriptions
  * 86198006 |Influenza vaccination (procedure)| has the synonym, influenza *immunization*

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