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An Indian child receives polio drops from a health worker during a polio immunisation programme at a colony where those suffering from leprosy also live in Siliguri on January 30, 2017. Around 174 million children of less than five years age across the country will be given polio drops as part of the drive of government to sustain polio eradication from the country. / AFP / DIPTENDU DUTTA (Photo credit should read DIPTENDU DUTTA/AFP/Getty Images)

An Indian child receives polio drops from a health worker during a polio immunisation programme at a colony where those suffering from leprosy also live in Siliguri on January 30, 2017.
Around 174 million children of less than five years age across the country will be given polio drops as part of the drive of government to sustain polio eradication from the country. / AFP / DIPTENDU DUTTA        (Photo credit should read DIPTENDU DUTTA/AFP/Getty Images)