The UN agencies' joint declaration follows confirmation by Ukraine's Ministry of Health on 1 September that a 10-month-old infant and a child of four were infected in the south-west of the country.
Shirika hilo linaonya kwamba watoto milioni tano wako katika hatari kutokana na kuzuka upya kwa siurua ambayo imeshawapata watoto elfu saba na wengine 400 wamearifiwa kufariki dunia tangu Septemba mwaka jana.