"Objective: To assess the association between covid-19 vaccines and risk of thrombocytopenia and thromboembolic events in England among adults.
Design: Self-controlled case series study using national data on covid-19 vaccination and hospital admissions...
Results: ... Secondary analyses found increased risk of CVST [cerebral venous sinus thrombosis] after ChAdOx1 nCoV-19 vaccination (4.01, 2.08 to 7.71 at 8-14 days), after BNT162b2 mRNA vaccination (3.58, 1.39 to 9.27 at 15-21 days), and after a positive SARS-CoV-2 test."
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