Updated April 13, 2021 at 4:50 PM ET
Federal health officials have called for a "pause" in the use of the Johnson & Johnson vaccine after reports that six women who got the vaccine developed blood clots afterward. Close to 7 million people have gotten this vaccine in the U.S. to date.
The Centers for Disease Control and Prevention says the blood clots are extremely rare but that it is reviewing the cases. The agency says it expects this pause to last for "a matter of days."