active immunity

noun

Definition of active immunity

: usually long-lasting immunity that is acquired through production of antibodies within the organism in response to the presence of antigens — compare passive immunity

Examples of active immunity in a Sentence

Recent Examples on the Web In active immunity, antibodies are generated through exposure to a pathogen or a vaccine. Los Angeles Times, "Confused about COVID-19 vaccines? Here’s your guide to vaccine vocabulary," 3 Dec. 2020 While active immunity occurs when an individual produces antibodies to a disease through his or her own immune system, passive immunity is provided when a person is given antibodies. Leah Groth, Health.com, "What to Know About Active Vs. Passive Immunity—And Why Both Matter With COVID-19," 15 Apr. 2020 But passive immunity doesn't last as long as active immunity, and loses effectiveness within a few weeks or months, per the CDC. Leah Groth, Health.com, "What to Know About Active Vs. Passive Immunity—And Why Both Matter With COVID-19," 15 Apr. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'active immunity.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of active immunity

1895, in the meaning defined above

Keep scrolling for more

Learn More about active immunity

Time Traveler for active immunity

Time Traveler

The first known use of active immunity was in 1895

See more words from the same year

Statistics for active immunity

Cite this Entry

“Active immunity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/active%20immunity. Accessed 17 May. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

More Definitions for active immunity

active immunity

noun

Medical Definition of active immunity

: usually long-lasting immunity that is acquired through production of antibodies within the organism in response to the presence of antigens — compare acquired immunity, innate immunity, passive immunity

Comments on active immunity

What made you want to look up active immunity? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Words Used by Nabokov Quiz

  • image1676440788
  • Choose the best definition or synonym for the word in bold: "There are some eructations that sound like cheers—at least, mine did." Lolita
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
 AlphaBear 2

Spell words. Make bears.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!