By James Gallagher
December 2, 2021
Scientists believe they have found “the trigger” that leads to extremely rare blood clots after the Oxford-AstraZeneca Covid vaccine.
The team – in Cardiff and the US – have shown in exquisite detail how a protein in the blood is attracted to a key component of the vaccine.
They think this kicks off a chain reaction, involving the immune system, that can culminate in dangerous clots.
The vaccine is thought to have saved about a million lives from Covid.
However, concerns about rare blood clots shaped how the vaccine has been used around the world including an alternative being offered to the under-40s in the UK.