What are vaccines?

a. sets of rules governing how health researchers can use patient
information

b. medications administered to healthy people to prevent infection

c. sets of precautions in place to prevent the global spread of
infection

d. medications administered to sick people to treat infection

The answer is B because you don’t give vaccinations to unhealthy people

B

Explanation:

a substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic substitute, treated to act as an antigen without inducing the disease.