What's the noun for immunise? Here's the word you're looking for.
immunization
(US, uncountable) The process by which an individual is safely exposed in a controlled manner to a material that is designed to prime their immune system against that material.
“Without vaccination, it can take days or weeks to acquire immunity to a particular disease.”
“To shield judges from political controversy, the constitution grants them immunity from criticisms against decisions and actions made in their official capacity.”
“What happens to foreign diplomatic personnel after they have been granted diplomatic immunity in the United States?”
immune
(epidemiology) A person who is not susceptible to infection by a particular disease
“Any student caught by the second pair of students joins the immunizer group.”
“Every Giant Eagle Pharmacy is also staffed with a qualified immunizer, who is able to administer both flu and pneumonia vaccinations.”
“Mollen Immunization Clinics, the nation s largest independent mass immunizer, has joined with Verizon Wireless and Google to expand access to a variety of immunizations.”