In Ukraine, a circulating vaccine-derived poliovirus type 1 (cVDPV1) outbreak has been confirmed. Two cases have been confirmed, with dates of onset of paralysis of 30 June and 7 July. The genetic similarity between the cases indicates active transmission of cVDPV1. Both are from the Zakarpatskaya oblast, in south-western Ukraine, bordering Romania, Hungary, Slovakia and Poland. Ukraine had been at particular risk of emergence of a cVDPV, due to inadequate vaccination coverage. In 2014, only 50% of children were fully immunized against polio and other vaccine-preventable diseases. Discussions are currently ongoing with national health authorities to plan and implement an urgent outbreak response. More.Expert Review Committee met in Nigeria last week to review the progress made in Nigeria, identify ways to strengthen the gains of the last few years and identify the major risks to stopping polio across the country. More