UN warns of polio resurgence around world
19 December 2013 Last updated at 00:10 GMT
United Nations health officials are warning of a global resurgence of polio if a significant outbreak in the Horn of Africa is not stopped.
A huge emergency vaccination campaign is under way in the region to reach millions of people and prevent further cases of the disease - which can cause paralysis and sometimes death.
Many of those affected by this outbreak are refugee populations - which makes it harder to control
Rajesh Mirchandani visited the Dadaab refugee camp in Kenya to see how they were fighting polio.