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, 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, 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, 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.

First Known Use of active immunity

1895, in the meaning defined above

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Time Traveler for active immunity

Time Traveler

The first known use of active immunity was in 1895

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Dictionary Entries Near active immunity

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Cite this Entry

“Active immunity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/active%20immunity. Accessed 15 Aug. 2022.

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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

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