natural immunity

noun
immunity that is present without prior immunization.
Also called native immunity.
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Collins
World English Dictionary
natural immunity
 
n
immunity with which an individual is born, which has a genetic basis

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

natural immunity n.
See innate immunity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
And animals that have natural immunity to certain viruses become reservoirs for
  disease.
They lose their natural immunity that kept the presence of pathogens in balance.
We must trust that a few members of a species would have a natural immunity to
  the virus.
In endemic areas there are few human cases among residents because of
  vaccination or natural immunity.
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