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MEERUT , UTTAR-PRADESH, INDIA, FEBRUARY 28, 2005: Health workers administer polio vaccines to children under five years old in the Zakir colony, a high risk area for polio transmittion in the city of Meerut. Workers also use indelible ink on the child's finger to make shure they don't miss anyone. Polio vaccination teams goes through a slum of Assamese migrant workers , looking for children to immunize. (Photo by Jean-Marc Giboux/Getty Images)