Immunization is the process by which individuals are protected from infection with bacterial or viral illness through the injection or ingestion of substances that create an immune state.

Please note: Immunization recommendations can change as new vaccines are developed. For the most up-to-date information, please visit the Centers For Disease Control and Prevention National Immunization Program at: http://www.cdc.gov/nip/

When you get an infection, your body reacts by producing substances called...