Within a couple of years, every country that started polio eradication rapidly eradicated all three of their polio viruses, with the exception of four countries that you see here.
In decurs de cateva zile, fiecare tara care incepuse eradicarea poliomielitei au eradicat rapid toate trei radacini de virus de poliomielita, cu exceptia a 4 tari pe care le vedeti aici.