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How does the Johnson & Johnson vaccine compare to other coronavirus vaccines? 4 questions answered

The Johnson & Johnson vaccine only requires one dose. Phill Magoke/AFP via Getty Images

How does the Johnson & Johnson vaccine compare to other coronavirus vaccines? 4 questions answered

The Johnson & Johnson vaccine only requires one dose. Phill Magoke/AFP via Getty Images

How does the Johnson & Johnson vaccine compare to other coronavirus vaccines? 4 questions answered

The Johnson & Johnson vaccine only requires one dose. Phill Magoke/AFP via Getty Images

How does the Johnson & Johnson vaccine compare to other coronavirus vaccines? 4 questions answered

The Johnson & Johnson vaccine only requires one dose. Phill Magoke/AFP via Getty Images

Johnson & Johnson is expected to ship out nearly four million doses as soon as the FDA grants emergency use authorization

Maureen Ferran, Rochester Institute of Technology

The U.S. Food and Drug Administration has authorized the use of the Johnson & Johnson coronavirus vaccine in adults. Maureen Ferran, a virologist at the Rochester Institute of Technology, explains how this third authorized vaccine works and explores the differences between it and the Moderna and Pfizer–BioNTech vaccines that are already in use.

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