Progress towards Polio Eradication?
Polio remains endemic in 4 countries: Afghanistan, India, Nigeria and Pakistan—with a further 4 countries known to have (Angola, Chad and Democratic Republic of the Congo) or suspected of having (Sudan) re-established transmission of poliovirus. Polio was endemic in more than 125 countries in 1988.
Polio remained endemic in 4 countries in 2010
Polio was endemic in more than 125 countries in 1988