Why isn’t the US sharing its extra vaccine doses with India? Premium As American vaccinations slow and doses accumulate, the U.S. is at a health, ethical and diplomatic crossroads (REUTERS) . Updated: 16 May 2021, 10:36 AM IST Bloomberg America led the world in buying up the messenger RNA vaccines that have proven most effective against Covid-19 Read Full Story Why isn’t the U.S. sharing its extra vaccine doses with the rest of the world? America led the world in buying up the messenger RNA vaccines that have proven most effective against Covid-19. It’s now starting to lead the world in not using them.