World Health Organization : Polio cases have spread to Aleppo and rural areas . Last month , health officials launched a program to immunize 1.6 million Syrian children against polio , measles , mumps and rubella -- in government- and rebel-held areas . It says a total of 17 new cases have been confirmed . The risk of further infection is high , the WHO says .
World Health Organization : Polio cases have spread to Aleppo and rural areas . It says a total of 17 new cases have been confirmed . The risk of further infection is high , the WHO says .