Vaccination
Administration of a vaccine to protect against disease
Summary
Vaccination is the administration of a vaccine to help the immune system develop immunity from a disease. Vaccines contain a microorganism or virus in a weakened, live or killed state, or proteins or toxins from the organism. In stimulating the body's adaptive immunity, they help prevent sickness from an infectious disease. When a sufficiently large percentage of a population has been vaccinated, herd immunity results. Herd immunity protects those who may be immunocompromised and cannot get a vaccine because even a weakened version would harm them.
Originally created by Malcolm Farmer
6/7/2001, 4:28:54 PM
Modified
5/21/2026, 8:35:09 AM
Recent revisions
[[WP:CVPI|Interceptor]]: Reverting non-constructive edits by [[Special:Contributions/~2026-30488-12|~2026-30488-12]]
/* Environmental effects */ | Altered journal. | [[:en:WP:UCB|Use this tool]]. [[:en:WP:DBUG|Report bugs]]. | #UCB_Gadget
/* History */ Added the language parameter to a reference.
/* History */
replaced 'is' with 'was'
Rewrote section to correct grammar and match source
Reverted 1 edit by [[Special:Contributions/~2026-90342-8|~2026-90342-8]] ([[User talk:~2026-90342-8|talk]]) to last revision by Seckends
Reverted 1 edit by [[Special:Contributions/~2026-90342-8|~2026-90342-8]] ([[User talk:~2026-90342-8|talk]])
/* History */Hanover was independent until the 1860s
Added bibcode. | [[:en:WP:UCB|Use this bot]]. [[:en:WP:DBUG|Report bugs]]. | Suggested by Abductive | #UCB_toolbar
Journal cites:, added 1 DOI
/* Opposition */ Delete a sentence that does not verify to the source. The source is a duplicate of the previous one.
/* Opposition */ self published source for medical claims? nuh uh
Undid revision [[Special:Diff/1324544814|1324544814]] by [[Special:Contributions/SigTif|SigTif]] ([[User talk:SigTif|talk]]) Not outdated medical advice.
