What does a vaccine contain?

Question

Quizplus · Accepted Answer

A vaccine usually contains weakened or dead pathogens or their toxins, which stimulate the immune system to produce a response without causing illness. This prepares the immune system to recognize and fight off the pathogen in the future. Option B is incorrect because antibodies are produced by the immune system, not included in a vaccine. Option C is partially correct as vaccines do produce memory B-and T-lymphocytes, but they are not the only components. Option D is also incorrect because vaccines do not contain chemicals to stimulate the immune response, they stimulate it through the use of weakened or dead pathogens.

What Does a Vaccine Contain