Definition: To protect against an infectious disease by vaccination , usually with a weakened (attenuated) or killed form of the disease-causing microorganism. While people are usually immunized against an infectious disease by getting vaccinated, having a disease such as measles, mumps, or rubella one time usually prevents or "immunizes" a person from getting this disease again. Other examples of immunizations are H1N1 flu, seasonal flu, hepatitis a and b, and pneumovax.
Also Known As: Vaccination
