Information included about the art and science of medicine and the betterment of public health.

The Center for Disease Control and Prevention provides this page with resources about vaccination.

Plenty of background information and useful resources for timing and types of vaccinations.

The College of Physicians of Philadelphia provides this resource to the background and history of vaccinations in the United States.

Run by the National Library of Medicine, MedLinePlus provides health information for patients, with resources about immunization and related topics.

The World Health Organization outlines information related to vaccinations globally.