Scientists identify reaction that may cause rare blood clots after AstraZeneca Covid vaccine - CNBC
Dec 02, 2021 54 secs

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.

Johnson & Johnson's Covid-19 vaccine also uses an adenovirus to carry spike proteins from the coronavirus into human cells to trigger an immune response and has similarly been linked to rare blood clots.

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 (PF4)

Alan Parker, a professor at Cardiff University's School of Medicine, said if a procedure responsible for the rare vaccine-induced blood clots was established, it may help to prevent and treat the disorder. 

"Vaccine-induced immune thrombotic thrombocytopenia [blood clots] only happens in extremely rare cases because a chain of complex events needs to take place to trigger this ultra-rare side effect," he said in a press release Wednesday

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