A person who is not susceptible to infection by a particular disease
To make immune.
(usually with "from") Exempt; not subject to.
As a diplomat, you are immune from prosecution.
(usually with "to") Protected by inoculation, or due to innate resistance to pathogens.
I am immune to chicken pox.
(by extension) Not vulnerable.
Alas, he was immune to my charms.
Of or pertaining to the immune system.
We examined the patient's immune response.