Immunizations, also called vaccinations, are given to protect people from becoming infected with certain diseases. Fragments of a disease organism or small amounts of a weakened disease organism are introduced into the body, usually by injection, which triggers the development of antibodies that can then recognize and destroy these disease organisms if later exposed to them.

Some immunizations are given only once, while others require several doses over time.

Sometimes an immunization does not completely prevent the disease, but it will significantly reduce its severity.

Last Updated: February 26, 2010

Author: Debby Golonka, MPH

Medical Review: John Pope, MD - Pediatrics & William Atkinson, MD, MPH - Public Health and Preventive Medicine

related physicians

related services

Bon Secours International| Sisters of Bon Secours USA| Bon Secours Health System

This information does not replace the advice of a doctor. Healthwise disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Privacy Policy. How this information was developed to help you make better health decisions.

© 1995-2010 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.