Which of the following statements correctly describes vaccines and how they help prevent viral infection?
A) Vaccines are active versions of a virus that stimulate an immune reaction in a person.
B) Vaccines are inactive versions of a virus that stimulate an immune reaction in a person.
C) Vaccines are infectious proteins that stimulate an immune reaction in a person.
D) Vaccines are infectious enzymes that stimulate an immune reaction in a person.

Question

Quizplus · Accepted Answer

Vaccines are typically made from an inactive or weakened form of a virus, which is not capable of causing disease on its own. When this vaccine is injected into a person, their immune system recognizes the foreign particle and produces a response to fight it off. This defense mechanism trains the immune system to recognize and combat the virus in the future, should the person ever be exposed to the actual virus.

Which of the Following Statements Correctly Describes Vaccines and How