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Text File  |  1992-09-01  |  305b  |  9 lines
  1. The use of specially modified pathogens
  2. (bacteria and viruses) to confer immunity to
  3. the diseases with which they are associated.
  4. When injected or taken by mouth, a vaccine
  5. stimulates the production of antibodies to
  6. protect against that particular disease.
  7. Vaccination is the oldest form of
  8. immunization.
  9.