Information from the CDC
Centers for Disease Control and Prevention
Immunization Action Coalition
Diseases that vaccines prevent can be dangerous, or even deadly. Vaccines greatly reduce the risk of infection by working with the body’s natural defenses to safely develop immunity to disease. This fact sheet from the CDC explains how the body fights infection and how vaccines work to protect people by producing immunity.
Children’s Vaccines Health Center on WebMD
US Food and Drug Administration
Centers for Disease Control and Prevention (CDC)