Asubstance prepared from killed or weakened pathogens that is introduced into the body to stimulate an immune response is known as: an antigen a macrophage a vaccine a migraine

The hepatitis B and the human papillomavirus (HPV) vaccines are made this way. The vaccine is composed of a protein that resides on the surface of the virus. This strategy can be used when an immune response to one part of the virus (or bacteria) is responsible for protection against disease.Jun 28, 2016

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