blood clotting events among some people who received COVID-19 vaccines made by AstraZeneca Plc and Johnson & Johnson.The researchers, in a study not yet reviewed by experts, said Wednesday that COVID-19 vaccines that employ adenovirus vectors – cold viruses used to deliver vaccine material – send some of their payload into the nucleus of cells, where some of the instructions for making coronavirus proteins can be misread.
The resulting proteins could potentially trigger blood clot disorders in a small number of recipients, they suggest. Rate of COVID-19 vaccine-related blood clots may be as high as 1 in 55,000: NACI Scientists and U.S.