American Academy of Family Physicians (AAFP)

familydoctor.org/familydoctor/en/kids/vaccines.html

Centers for Disease Control and Prevention (CDC)

www.cdc.gov/vaccines/vac-gen/default.htm

National Institutes of Health (NIH)

www.health.nih.gov/topic/ChildhoodImmunization

www2.aap.org/immunization/families/families.html

US Food and Drug Administration (FDA)

www.fda.gov/BiologicsBloodVaccines/Vaccines/default.htm