http://www.newsweek.com/cerebral-venous-sinus-thrombosis-cvst-explained-covid-vaccine-blood-clots-1583228

Top American health agencies have recommended the rollout of the Johnson & Johnson (Janssen) vaccine be paused as experts investigate six reported cases of a "rare and severe" type of blood clot in people who received the shot.

Officials from the Centers for Disease Control and Prevention (CDC) and the Food and Drug Administration (FDA) confirmed in a joint statement on Tuesday that the handful of known cases were linked to a condition called cerebral venous sinus thrombosis.