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A boy receives polio vaccine drops at a clinic in Kiev, Ukraine, October 21, 2015. Two children in southwestern Ukraine were paralysed by polio, the first outbreak of the disease in Europe since 2010, the World Health Organization said in September, in a setback for a global eradication campaign. The WHO said Ukraine had been at particular risk of an outbreak because of inadequate vaccination coverage. In 2014, only 50 percent of children were fully immunised against polio and other preventable diseases, it said.  Gleb Garanich/Reuters