Misinformation about Cerebral Venous Thrombosis following vaccination

Claim: Covid vaccination is associated with CVT (cerebral venous thrombosis)

True, but extremely rare, and like most vaccine side effects, much more common following INFECTION than vaccination.

Frequently cited sources of claim

Association of Cerebral Venous Thrombosis with mRNA COVID-19 Vaccines: A Disproportionality Analysis of the World Health Organization Pharmacovigilance Database
https://www.mdpi.com/2076-393X/10/5/799/htm (2022-05-18)

This paper finds that there is an association between vaccination and CVT

CVT occurs more frequently following infection than vaccination

"the incidence rate ratio of CVT requiring hospitalization within 6 weeks of SARS-CoV-2 infection was 32 times higher compared with after mRNA-based SARS-CoV-2 vaccination."
https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2790206 (2022-03-17)

"The incidence of CVT and PVT is significantly increased after COVID-19 [compared to after vaccination]. The data highlight the risk of serious thrombotic events in COVID-19 and can help contextualize the risks and benefits of vaccination in this regard."
https://osf.io/a9jdq/ (2021-04-26)

"COVID-19 increasesthe risk of CVT and PVT compared to patients diagnosed with influenza,andto people who have received aCOVID-19 mRNA vaccine."
https://osf.io/a9jdq/ (2021-04-26)

"COVID-19 is associated with a markedly increased incidence of CVT compared to patients with influenza, people who have received BNT162b2 or mRNA-1273 vaccines and compared to the best estimates of the general population incidence."
https://www.thelancet.com/journals/eclinm/article/PIIS2589-5370(21)00341-2/fulltext (2021-07-31)