By Adam Cancryn, Sarah Owermohle and Erin Banco

Operation Warp Speed poured billions into Moderna and agreed not to share its vaccines abroad. Now the company is holding up the race to vaccinate low-income countries.

Operation Warp Speed poured billions into Moderna and agreed not to share its vaccines abroad. Now the company is holding up the race to vaccinate low-income countries.

Operation Warp Speed poured billions into Moderna and agreed not to share its vaccines abroad. Now the company is holding up the race to vaccinate low-income countries.

Operation Warp Speed poured billions into Moderna and agreed not to share its vaccines abroad. Now the company is holding up the race to vaccinate low-income countries.

Operation Warp Speed poured billions into Moderna and agreed not to share its vaccines abroad. Now the company is holding up the race to vaccinate low-income countries.

Operation Warp Speed poured billions into Moderna and agreed not to share its vaccines abroad. Now the company is holding up the race to vaccinate low-income countries.

Operation Warp Speed poured billions into Moderna and agreed not to share its vaccines abroad. Now the company is holding up the race to vaccinate low-income countries.

The internal deliberations have stretched on for months as health officials watch for signs of waning immunity among high-risk groups.

The internal deliberations have stretched on for months as health officials watch for signs of waning immunity among high-risk groups.

The internal deliberations have stretched on for months as health officials watch for signs of waning immunity among high-risk groups.

The internal deliberations have stretched on for months as health officials watch for signs of waning immunity among high-risk groups.