Regulatory authorities in the U.S. and Europe have either paused or constrained the use of COVID-19 vaccines from AstraZeneca (LON:AZN) and Johnson & Johnson (NYSE:JNJ), causing some to wonder why the adenoviral-vector vaccines have been potentially linked to similar blood clotting events. Researchers have observed blood clotting events associated with adenoviral vectors since the late-1990s […]
