Polio is an infectious disease caused by a virus that lives in the throat and intestinal tract. It is most often spread through person-to-person contact with the stool of an infected person and may also be spread through oral/nasal secretions. Polio used to be very common in the United States and caused severe illness in thousands of people each year before polio vaccine was introduced in 1955. Most people infected with the polio virus have no symptoms; however, for the less than 1 percent who develop paralysis it may result in permanent disability and even death.
Most people should get polio vaccine when they are children. Children get 4 doses of polio vaccine at ages 2 months, 4 months, 6-18 months, and a booster dose at 4-6 years. Oral polio vaccine (OPV) has not been used in the United States since 2000, but is still used in many parts of the world.
Source: Centers for Disease Control and Prevention
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