The results, available as a non-peer reviewed preprint,1 show that the risk of cerebral venous thrombosis “is many-fold higher after covid-19 than after receiving a vaccine,” Maxime Taquet, NIHR academic clinical fellow in psychiatry at the University of Oxford and an author of the study, told journalists at a Science Media Centre briefing in London on 15 April In all age and risk groups the potential benefits of vaccination far outstripped the potential harms, except people at low risk who were under 30 3 This week US regulators paused the rollout of the Janssen (Johnson & Johnson) covid-19 vaccine, which like the AstraZeneca vaccine uses a viral vector platform, after reports of a small number of blood clot cases in people who had received this vaccine 4 1 Taquet M, Husain M, Geddes JR, Luciano S, Harrison PJ Cerebral venous thrombosis: a retrospective cohort study of 513 284 confirmed COVID-19 cases and a comparison with 489 871 people receiving a COVID-19 mRNA vaccine https://osf io/a9jdq/ 2 Mahase E Covid-19: AstraZeneca vaccine is not linked to increased risk of blood clots, finds European Medicine Agency
Covid-19: Risk of cerebral blood clots from disease is 10 times that from vaccination, study finds