Very few: Since immunization against polio has been so successful, there are few cases in the world. Cases are confined to I immunized populations in parts of the world where there has been suspicion of immunization programs, such as in Pakistan and a few other countries.
Answered 5/26/2017
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Very few: Per the World Health Organization only 22 cases were reported worldwide in 2017 in 3 countries: Pakistan, Afghanistan and Nigeria.
Answered 7/22/2020
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