Two teams of European scientists, working independently, say they believe they've identified the cause of a rare blood clotting condition that has occurred in some people after receiving the AstraZeneca COVID-19 vaccine. If correct, their research could mean any blood clots that occur could be easily treated. There were reports earlier this month of roughly 30 blood clots occurring after vaccination, a few of them fatal. This led more than a dozen European countries to suspend their use of the AstraZeneca vaccine.