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When the coronavirus hit, the Serum Institute of India, the world\u2019s largest vaccine maker, seemed uniquely positioned to help. It struck a deal with AstraZeneca, promising a billion vaccine doses to low- and middle-income nations. \nEarlier this year, a ban instituted by Prime Minister Narendra Modi put a stop to those plans. \nWhat has that meant for the nations promised millions of doses?\n\nGuest: Emily Schmall, a South Asia correspondent for The New York Times based in New Delhi.