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This electron microscope image made available by the U.S. National Institutes of Health shows a human T cell, in blue, under attack by HIV, in yellow, the virus that causes AIDS. Seth Pincus, Elizabeth Fischer, Austin Athman/AP hide caption

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Seth Pincus, Elizabeth Fischer, Austin Athman/AP
Jackyenjoyphotography/Getty Images

A nurse holds a vial of Moderna Covid-19 vaccine. Patrick Meinhardt/AFP via Getty Images hide caption

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Patrick Meinhardt/AFP via Getty Images