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Pfizer, BioNTech Seek to Expand Enrollment of Vaccine Trial

Residents Participate In Pfizer Covid-19 Vaccine Clinic Trial
Photographer: Eva Marie Uzcategui/Bloomberg

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Pfizer and BioNTech have submitted an amended protocol to the U.S. Food and Drug Administration to expand the enrollment in their Phase III Covid-19 vaccine trial to up to 44,000 participants, according to a statement.