Type the correct answer in the box. Spell the word correctly.
What is the procedure by which a person can be immunized against a disease?
Joey's mother and pediatrician agree that it's prudent to boost Joey's adapted immune system by introducing it to pathogens in a controlled way
so that it can recognize them and build resistance against them. Joey can be immunized at his pediatrician's office against the disease measles
by means of
, which is the introduction of a mild form of a disease to the body, often by means of injection.