A Pause on the Johnson & Johnson Vaccine

Six cases of a rare blood clotting disorder have led U.S. health officials to pause the use of Johnson & Johnson's Covid-19 vaccine. Though it's not known if the vaccine is behind the blood clotting, WSJ's Jonathan D. Rockoff says the pause could impact efforts to vaccinate the country. Learn more about your ad choices. Visit megaphone.fm/adchoices