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Polio League Table: What the rankings mean...

Countries ranked 1

Polio eradication certified.

Countries ranked 2

Polio transmission probably ceased, but not certified.

Countries ranked 3

Low levels of wild polio virus transmission. Eradication could be achieved within a short time.

Countries ranked 4

Significant wild polio virus transmission (in some cases, lack of data).

Countries ranked 5

Eradication will be especially difficult (in many cases because health infrastructure is affected by armed conflict or civil strife).