An Afghan health worker administers the

An Afghan health worker administers the polio vaccine to a child on the second day of a vaccination campaign in Kabul on March 15, 2010. A three-day nationwide polio eradication signature project is a joint initiative implemented by the Public Health Ministry, the United Nations Children's Fund (UNICEF) and the World Health Organisation (WHO). Afghanistan is one of only of a handful of countries in the world that still has the crippling polio virus with new cases reported every year, most often in areas where insurgent threats mean vaccinators are unable to reach all children. AFP PHOTO/BEHROUZ MEHRI (Photo credit should read BEHROUZ MEHRI/AFP via Getty Images)