(n) :
(US, uncountable) The process by which a person is safely exposed in a controlled manner to a material that is designed to prime their immune system against that material.
(n) :
(US, uncountable) The process by which any organism's body develops immunity against a pathogen.
(n) :
(US, uncountable) The process by which a person is safely exposed in a controlled manner to a material that is designed to prime their immune system against that material.
(n) :
(US, uncountable) The process by which any organism's body develops immunity against a pathogen.