The global rollout of Covid-19 vaccines was never going to be easy. But it quickly descended into frustration at home and nationalistic acrimony abroad as countries around the world deal with logistical and political challenges.All 50 states in the U.S. are reporting shortages as America's fragmented administrative and health care systems struggle to distribute even the limited vaccine stocks that have been produced. Europe has descended into its own ugly fight over supplies. And there is little sign that the poorest countries in the world will get access anytime soon, perhaps not until 2023. | 
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