Covid-19 to make a calculation. But positive results could clear the way for approval, he said.Bourla’s assurances come just as Pfizer and BioNTech have expanded the number of clinical trial participants they’re seeking in order to include more people with diverse backgrounds.Expanded EnrollmentThe companies said in a statement Saturday that they expect to enroll the 30,000 patients they originally sought for its final-phase clinical trial this week.
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