Vaccination is a medical procedure that involves the administration of a weakened or killed form of a virus, bacteria, or another pathogen to stimulate the body’s immune system to develop immunity to a particular disease. Vaccines are typically administered through injection, but can also be administered orally or nasally. Vaccines are used to prevent and control the spread of infectious diseases, such as measles, mumps, rubella, polio, and influenza. Vaccines are also used to prevent and treat certain types of cancer.« Back to Glossary Index
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