The CDC and FDA are reviewing data involving six reported U.S. cases of a rare and severe type of blood clot in people who received the J&J vaccine. These reported cases occurred among women between the ages of 18 and 48. Symptoms occurred 6 to 13 days after vaccination.
These blood clots events appear to be very rare. Nearly seven million patients have received the J&J vaccine with no other reported signs of this type of blood clot. Out of an abundance of caution, the CDC and FDA recommended the use of this vaccine be paused until additional reviews are complete.