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Ten cases of polio have been confirmed among children in Syria, the first outbreak of the disease in that country since 1999.
There were 22 suspected cases that were identified on October 17 in the eastern city of Deir Ezzor after the children exhibited symptoms of "acute flaccid paralysis" - a sudden onset of weakness and floppiness in any part of a child's body or paralysis in anyone in whom polio is suspected as the cause.
The confirmation was key because other diseases can cause similar symptoms.
Atika Shubert reports on the crisis that leaves 500,000 at risk.