While it is a global power in vaccine production, India didn’t purchase enough doses to protect itself. When its cases were relatively low, it exported more than 60 million shots; now exports have essentially been shut down. The chief executive of Serum Institute of India, the world’s largest vaccine manufacturer, is in Britain, having come under increasingly intense pressure at home... “As soon as vaccines arrive, we will let you know, then you can come for shots,” said Delhi’s chief minister, Arvind Kejriwal, the BBC reported. “We appeal to you not to crowd vaccine centers in the next few days.” As long as vaccines are in short supply and the virus is running rampant, experts warn that dangerous variants will evolve, spread and possibly evade vaccines. That could eventually pose a threat even for countries like the United States, where 40 percent of the population is fully vaccinated. Michael Diamond, a viral immunologist at Washington University in St. Louis, said that the only way to break the cycle is to ensure countries like India get enough vaccines.