After the U.S. administered nearly 7 million doses of the Johnson & Johnson COVID-19 vaccine, the CDC and FDA this morning issued a recommendation to pause using that particular vaccine after six women developed blood clots following their vaccinations. 

Dan discusses how this recommendation was likely made, why and how to understand it with Julie Morita, executive vice president of the Robert Wood Johnson Foundation, who has served on the CDC’s Advisory Committee on Immunization Practices, as commissioner for the Chicago Department of Public Health, and on the Biden Covid-19 advisory board.