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Centers for Disease Control and Prevention (CDC)
The CDC (the national public health institute of the United States) promotes health and quality of life by preventing and controlling disease, injury, and disability.
CDC: Vaccines & Immunizations
The CDC's site has information on vaccines, including immunization schedules, recommendations, FAQs, and more.
World Health Organization (WHO)
WHO, the United Nations' specialized agency, works to give people worldwide the highest possible level of health - physically, mentally, and socially.
Immunization Action Coalition
This organization is a source of childhood, adolescent, and adult immunization information as well as hepatitis B educational materials.
Ready.gov - From the U.S. Department of Homeland Security
Ready.gov aims to help Americans learn about potential threats to be better prepared to react during an attack.