Vaccination is the administration of a vaccine to help the immune system develop protection from a disease. Vaccines contain a microorganism or virus in a weakened, live or killed state, or proteins or toxins from the organism. In stimulating the body’s adaptive immunity, they help prevent sickness from an infectious disease.

When a sufficiently large percentage of a population has been vaccinated and become immune, herd immunity results which indirectly protects the non-immune population because infection transmission is low. The effectiveness of vaccination has been widely studied and verified. Vaccination is a most effective method of preventing infectious diseases. Continue reading “Cancer Vaccination” →