The Centers for Disease Control and Prevention (CDC) and the Food and Drug Administration (FDA) on April 13, 2021, halted use of the one-dose Johnson & Johnson COVID-19 vaccine that has been given to 6.8 million people in the U.S. The pause is due to reports of blood clotting in six people who have received the vaccine.
Dr. William Petri, an infectious disease physician and immunologist at the University of Virginia School of Medicine, answers questions to help put this development in context.
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