Two large populational-based studies find a slightly increased risk of thrombotic events following AstraZeneca COVID-19 vaccination.

Association of COVID-19 vaccines ChAdOx1 and BNT162b2 with major venous, arterial, or thrombocytopenic events: A population-based cohort study of 46 million adults in England – PLOS Medicine

See also: First dose ChAdOx1 and BNT162b2 COVID-19 vaccinations and cerebral venous sinus thrombosis: A pooled self-controlled case series study of 11.6 million individuals in England, Scotland, and Wales – PLOS Medicine

Commentaries:

Two studies find only small elevated risk of blood clots following AstraZeneca COVID-19 vaccination – PLOS

Two Large Studies Affirm Rare Thrombosis Risk With ChAdOx1 COVID-19 Vax – TCTMD