natural immunity

American

noun

immunity that is present without prior immunization.

natural immunity British

noun

immunity with which an individual is born, which has a genetic basis

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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natural immunity

Surviving populations may have natural immunity, which could help shape more resilient captive-rearing programs.

From Los Angeles Times ● Aug. 4, 2025

McGill University scientists have discovered that pregnancy may trigger a natural immunity to boost protection against severe flu infection.

From Science Daily ● Dec. 2, 2024

He argued against lockdowns and masking for children, questioned the benefits of vaccine boosters, and predicted incorrectly that populations would quickly acquire natural immunity to SARS-CoV-2.

From Science Magazine ● Nov. 25, 2024

Prof Openshaw is clear "we are not there yet" with Covid, but "with repeated infection we should build up natural immunity".

From BBC ● Dec. 16, 2023

Science shows that 95 percent of the human population has natural immunity to Hansen’s disease.

From "At Last She Stood" by Erin Entrada Kelly

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023