Houghton Mifflin Harcourt
Harcourt: Biographies: Louis Pasteur
An introduction to the life and achievements of the great scientist Louis Pasteur. (In Spanish)
American Academy of Family Physicians
American Family Physician: Polio Vaccine
This article provides responses to common questions about the polio virus and disease, as well as information on immunization schedules for young children. Included is information on the polio vaccines risks and reactions.