Scientists claim to have discovered a “potential mechanism” that triggers rare blood clots in some people who receive the Oxford-AstraZeneca Covid vaccine. Links between the vaccine and rare, sometimes fatal, blood clots have prompted some countries to restrict its use to older adults or favor alternative shots.
Medical experts have repeatedly said the benefits of the vaccine outweigh the risks associated with it, with one study concluding that Covid-19 poses a much bigger threat of blood clots than vaccination. Scientists from Cardiff University in the U.K. and Arizona State University in the U.S. worked with AstraZeneca to investigate vaccine-induced blood clots.
The team behind the study said they believed the chimpanzee virus used in the Oxford-AstraZeneca vaccine had a specific interaction that could prompt the body’s defenses to act against itself. According to the study, the viral vector in the Oxford-AstraZeneca vaccine, in rare cases, enters the bloodstream, where it can bind to a protein called platelet factor 4.