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This September 2020 photo provided by Johnson & Johnson shows a single-dose COVID-19 vaccine being developed by the company. Johnson & Johnson is beginning a huge final study to try to prove if the single-dose vaccine can protect against the coronavirus. (Cheryl Gerber/Courtesy of Johnson & Johnson via AP)

This September 2020 photo provided by Johnson & Johnson shows a single-dose COVID-19 vaccine being developed by the company. Johnson & Johnson is beginning a huge final study to try to prove if the single-dose vaccine can protect against the coronavirus. (Cheryl Gerber/Courtesy of Johnson & Johnson via AP)

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