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Polio is a highly contagious infectious disease caused by a virus that invades the nervous system. Poliovirus spreads through contact with the stool (feces) of an infected person or droplets from a sneeze or cough.

In the 1950s, before polio vaccines were available in the US, polio outbreaks caused more than 15,000 cases of paralysis each year. After polio vaccines were introduced in the US, the number of polio cases fell rapidly to less than 100 per year in the 1960s and fewer than 10 in the 1970s.

Public health officials are currently investigating a reported case of polio and detection of poliovirus in wastewater in New York, which underscores the importance of routine polio vaccination.


Most individuals infected with the virus will not experience any symptoms at all; some individuals will experience minor symptoms such as fever, fatigue, nausea, headache, flu-like symptoms, stiffness in the neck and back, and pain in the limbs which often resolves completely.

In some people, the poliovirus can result in paralysis (usually the legs), which can lead to permanent disability. The poliovirus can cause death when it paralyzes the muscles that help people breathe.

About 1-5 out of 100 people who are infected with poliovirus infection will develop meningitis (an infection of the spinal cord or brain).

  • Since widespread use of the vaccine, which began in the 1950s, polio has been eliminated in the US. However, the virus continues to circulate in different parts of the world. It is critical that all children get vaccinated for polio as recommended.

    Most US adults were vaccinated as children and do not need further vaccine doses. Adults who are unsure of their vaccination status may get vaccinated.

    Anyone who did not receive a complete vaccine series (three doses at 2, 4, and 6-18 months, one dose at 4-6 years) as a child should complete the series as soon as possible.


There is no cure for paralytic polio and no specific treatment. Physical or occupational therapy can help with arm or leg weakness caused by polio.


Updated August 2022

Source: Centers for Disease Control and Prevention


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