The United States will send its first shipments of surplus COVID-19 vaccine doses abroad on Thursday, spelling out for the first time how it will share its wealth of vaccines with parts of the world struggling to get shots in arms. The Biden administration has previously said it would share 80 million doses by the end of June. "We know that won't be sufficient," said Jeff Zients, coordinator of the White House COVID-19 response. But he said it's an important step toward boosting global production and trying to end the global pandemic. "We expect a regular cadence of shipments around the world across the next several weeks. And in the weeks ahead, working with the world's democracies we will coordinate a multilateral effort, including the G-7, to combat and end the pandemic," Zients said.