https://www.scientificamerican.com/article/johnson-johnson-vaccine-suspension-what-this-means-for-you/

The following essay is reprinted with permission from The Conversation, an online publication covering the latest research.

The Centers for Disease Control and Prevention and the Food and Drug Administration 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. One woman died, and another has been hospitalized in critical condition. 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.