When getting a vaccination, which substance is

injected into the body?

(1) bacteria to combat a pathogen

(2) white blood cells to engulf a pathogen

(3) a weakened form of a virus

(4) antibiotics to kill a virus

Answer - 3. A weakened form of a virus

When getting a vaccination, the substance which is injected into the body is a weakened form of a virus. This weakened from of the virus has the ability to arouse the body’s defense mechanism without causing an infection.