With Pfizer shot spoken for, U.S. snaps up 100M more Moderna COVID-19 vaccine doses

With one COVID-19 vaccine authorized in the U.S. and another candidate speeding toward an OK this week, Operation Warp Speed is hustling to lock down hundreds of millions of shots for a massive U.S. immunization campaign. So far, it's striking out in expanding an order from Pfizer—but it managed to score an additional 100 million doses from archrival Moderna.