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In this March 6, 2021, file photo, boxes stand next vials of Johnson & Johnson COVID-19 vaccine in the pharmacy of National Jewish Hospital for distribution in Denver. U.S. health officials are weighing next steps as they investigate unusual blood clots in a small number of people given the vaccine -- a one-dose shot that many countries hoped would help speed protection against the pandemic. (AP Photo/David Zalubowski, File)  **FILE**

In this March 6, 2021, file photo, boxes stand next vials of Johnson & Johnson COVID-19 vaccine in the pharmacy of National Jewish Hospital for distribution in Denver. U.S. health officials are weighing next steps as they investigate unusual blood clots in a small number of people given the vaccine -- a one-dose shot that many countries hoped would help speed protection against the pandemic. (AP Photo/David Zalubowski, File) **FILE**

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