AlQa'dah 18, 1436, Sep 2, 2015, SPA -- The World Health Organization (WHO) said Wednesday that two children in southwestern Ukraine have been paralyzed by polio, the first outbreak of the disease in Europe since 2010. The WHO said in a statement that the outbreak occurred because only half of Ukrainian children are immunized against polio, and the risk of further spread within the country is high, although the risks for nearby Romania, Poland, Hungary, and Slovakia is low.