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Q&A: Johnson & Johnson COVID-19 vaccine

A COVID-19 vaccine developed by Johnson & Johnson

A COVID-19 vaccine developed by Johnson & Johnson is nearing approval by the U.S. Food and Drug Administration. Credit: NurPhoto via Getty Images

A third coronavirus vaccine, developed by Johnson & Johnson, was cleared for emergency use by the U.S. Food and Drug Administration on Saturday. Unlike the other vaccines, it’s a single-dose shot and doesn’t require ultracold storage. It’s expected to speed up how fast herd immunity is reached.

How many doses of the Johnson & Johnson vaccine are required?

At what temperature does the J&J vaccine need to be stored before injection into the recipient?

What about the properties of the J&J vaccine makes it easier to vaccinate more people more quickly than others?

Where is the J&J vaccine in the bureaucratic approval process?

Are there more vaccines in the works?

How does the Johnson & Johnson vaccine work, and how is Johnson & Johnson’s vaccine different from the Moderna and Pfizer-BioNTech vaccines?

How does the efficacy compare with the other vaccines?

Are there side effects?