U.S. Pledge to Vaccinate Poor Countries Stumbles Amid Logistical Challenges

A White House plan to donate hundreds of millions of doses of Covid-19 vaccines has been hampered in many developing countries by a lack of infrastructure to handle storage and distribution, leaving poorer nations far behind the developed world in vaccination rates. After a delayed start—the U.S. missed its first donation target—the Biden administration has been ramping up overseas donations, shipping around 137 million doses, most of them Moderna Inc. and Johnson & Johnson. It expects to send 500 million doses of a shot developed by Pfizer Inc. and BioNTech SE by the end of June 2022, the largest donation total of any country.