translation.en: Childhood immunisation programmes with live weakened oral poliovirus vaccine (OPV) or with inactivated, injectable poliovirus vaccine (IPV) has been very effective.
translation.ro: Programele de imunizare a copiilor cu vaccin poliomielitic cu virus viu atenuat, cu administrare orală (OPV), sau cu vaccin poliomielitic cu virus inactivat injectabil (IPV) s-au dovedit a fi foarte eficace.