By RICARDO ALONSO-ZALDIVAR Associated Press WASHINGTON (AP) — U.S. officials say they're actively negotiating for additional purchases of Pfizer's coronavirus vaccine after passing up a chance to lock in a contract this summer since it was still unclear how well the shots would work. Health and Human Services Secretary Alex Azar and special adviser Dr. Moncef Slaoui also told reporters Wednesday that Pfizer had been unable to commit to a firm delivery date. Azar called that 'the core issue.' There was no immediate comment from the company, whose CEO Albert Bourla told CNN this week it is 'working very collaboratively' […]
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