A substance added to a vaccine to improve the immune response so that less vaccine is needed.
immune response (ih-MYOON reh-SPONTS)
The activity of the immune system against foreign substances (antigens).
Source: The National Cancer Institute's Dictionary of Cancer Terms (http://www.cancer.gov/dictionary)
vaccine (vak-SEEN)
A substance or group of substances meant to cause the immune system to respond to a tumor or to microorganisms, such as bacteria or viruses. A vaccine can help the body recognize and destroy cancer cells or microorganisms.
Source: The National Cancer Institute's Dictionary of Cancer Terms (http://www.cancer.gov/dictionary)
