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immunization
References & Edit History Related Topics
Images, Videos & Interactives
DPT vaccine Vaccines by the numbers Vaccine timeline Infographic showing estimated lives saved by childhood vaccinations worldwide from 1974 to 2024, with syringe-shaped bars for each disease. Measles tops the list at 93.71 million lives saved, followed by tetanus, whooping cough, and others, for a total of 153.84 million lives saved. A chart showing the American Academy of Pediatrics recommended immunization schedule for children from birth to 6 years, listing vaccines and timing for each dose across a timeline, with color-coded markers for standard and high-risk recommendations.
The video thumbnail image shows a historical painting of George Washington and Revolutionary troops in the winter.
A doctor in a white lab coat and gloves gives an injection to a young girl sitting on an exam table, steadying her upper arm with one hand. Immunization
How did the polio vaccine change the world?
Children with polio and the administration of polio vaccine
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immunization: References & Edit History

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  • The Editors of Encyclopaedia Britannica
    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

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Article History

Type Description Contributor Date
Expanded top questions. Sep 17, 2026
Display issue corrected. Sep 11, 2025
Cross-references added. Sep 11, 2025
Added an illustration showing information on lives saved by childhood vaccinations, 1974–2024. May 30, 2025
Questions and answers added. Mar 13, 2025
Added an interactive timeline on vaccine development. Feb 11, 2025
Added information on the impact of immunization on public health. Feb 04, 2025
Media added. Sep 16, 2024
Invalidated site: National Library of Medicine - Immunization. Nov 22, 2017
Add new Web site: World Health Organisation - Immunization. Sep 21, 2011
Media added. Jun 08, 2009
Added new Web site: How Stuff Works - Healthguide - Immunizations In-Depth. Oct 01, 2008
Added new Web site: How Stuff Works - Healthguide - Immunizations. Oct 01, 2008
Added new Web site: The Nemours Foundation - For Teens - Immunizations. May 09, 2008
Added new Web site: Worldcolleges.info - Immunisation. May 02, 2008
Article revised. Nov 22, 2000
Article added to new online database. Jul 20, 1998
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