Researchers have begun giving healthy volunteers in the U.S. an experimental coronavirus vaccine developed by Pfizer Inc. and partner BioNTech SE, the latest study exploring a potential defense against the respiratory disease.

Researchers at the New York University Grossman School of Medicine in Manhattan and the University of Maryland School of Medicine in Baltimore said Tuesday they began injecting people with the first of four vaccine candidates from Pfizer and Germany’s BioNTech.

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