How does the Johnson & Johnson COVID-19 vaccine compare with the Pfizer and Moderna shots?

On Tuesday, February 24th, the U.S. Food and Drug Administration released the results of its study of the Johnson & Johnson coronavirus vaccine. Maureen Ferran, a virologist at Rochester Institute of Technology, explains how this new vaccine works and examines the differences between it and the already approved Moderna and Pfizer-BioNTech vaccines. How does the Johnson & Johnson vaccine work?
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