1988
More than 125 polio-endemic countries
World Health Assembly resolution to eradicate polio
1991
Last case of wild polio in the WHO Region of the Americas
1994
The WHO Region of the Americas certified as polio-free
1997
Last case of wild polio in the WHO Western Pacific Region
1998
Last case of wild polio in the WHO European Region
2000
The WHO Western Pacific Region certified as polio-free
2002
The WHO European Region certified as polio-free
2003
Six remaining polio-endemic countries – Afghanistan, Egypt, India, Niger, Nigeria, Pakistan.
2010
Four endemic countries remain.
