In New Delhi, at several of the 7,000 vaccination booths that span the Indian capital, children get two drops of an oral polio vaccine, after which one of their pinkie fingers is painted with indelible purple ink -- a procedure that is being repeated across the vast country, which aims to reach more than 170 million children under five on regular National Immunization Days. The next few years will decide whether the program -- which has staved off new cases of the virus for a year -- ends in success or failure.

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