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FILE - This September 2020 photo provided by Johnson & Johnson shows a single-dose COVID-19 vaccine being developed by the company. A late-stage study of Johnson & Johnson’s COVID-19 vaccine candidate has been paused while the company investigates whether a study participant’s “unexplained illness” is related to the shot, the company announced Monday, Oct. 12, 2020. (Cheryl Gerber/Courtesy of Johnson & Johnson via AP, File)

FILE - This September 2020 photo provided by Johnson & Johnson shows a single-dose COVID-19 vaccine being developed by the company. A late-stage study of Johnson & Johnson’s COVID-19 vaccine candidate has been paused while the company investigates whether a study participant’s “unexplained illness” is related to the shot, the company announced Monday, Oct. 12, 2020. (Cheryl Gerber/Courtesy of Johnson & Johnson via AP, File)