Use your understanding of prevention and treatment of viruses to answer the questions below. A
is a substance containing incomplete portions of a virus that produce an immune response when injected into the body.

I'm a bit confused about this question. But I will try my best to answer. :)

To prevent a certain virus, or increase someone's immunity towards a virus, doctors give patients a shot/vaccine. For example, people get a flu shot yearly to help prevent them from getting the flu. The shot contains a small portion of the flu itself. The flu remains dormant until the body decides to activate it or fight it off. This also helps the body become more immune to the virus/sickness and fight it off easier.

I hope this helps! :)

that is wrong, its not thymus.