AP: “President Joe Biden is set to announce that the United States is doubling its purchase of Pfizer’s COVID-19 shots to share with the world to 1 billion doses as he embraces the goal of vaccinating 70% of the global population within the next year. The stepped-up U.S. commitment is to be the cornerstone of the global vaccination summit Biden is convening virtually Wednesday on the sidelines of the U.N. General Assembly, where he plans to push well-off nations to do more to get the coronavirus under control. World leaders, aid groups and global health organizations are growing increasingly vocal about the slow pace of global vaccinations and the inequity of access to shots between residents of wealthier and poorer nations. The U.S. purchase, according to two senior Biden administration officials who spoke on the condition of anonymity to preview Biden’s remarks, will bring the total U.S. vaccination commitment to more than 1.1 billion doses through 2022. At least 160 million shots supplied by the U.S. have been distributed to more than 100 countries, representing more donations than the rest of the world combined.”