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Polio cases by world region, 1980 to 2016

Shown is the estimate of the total number of paralytic polio cases.

19802016198519901995200020052010South-East AsiaWestern PacificEuropeEasternMediterraneanAmericasAfrica

Source: WHO (2018) and Tebbens et al. (2011)

Note: These estimates are based on a model by Tebbens et al. (2011) that multiplies the reported number of cases with a correction factor based on the quality of each country's surveillance system. After
a country is certified polio-free, however, the reported polio cases are used.