India has gone more than two years without a diagnosis of infection with the wild polio virus, a milestone that is "a triumph of consistent and strong political will as well as international coordination," Krista Mahr writes. If India goes a third year without a polio case, it will be declared free of the disease -- one of the world's major public-health successes. Lessons learned in India could be helpful in neighboring Pakistan, where the disease is still endemic.

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