| 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). |
