People walk past notices announcing that Covishield, the Oxford/AstraZeneca Covid-19 vaccine being manufactured by the Serum Institute of India, is out of stock at a vaccination center in Mumbai, India, on April 20, 2021. India’s vaccination program began with great promise, given the country’s experience with vaccination campaigns and its advantage as one of the major global manufacturers of the doses itself. As it started its own vaccination campaign, India donated supplies of its vaccine to neighboring countries in a major show of vaccine diplomacy.