Based on the cross-sectional study of Coutinho, Zuurbier, and Stam in 2012, the incidence of rare blood clots in the brain (cerebral venous thrombosis or CVT) is 1.32 per 100,000 people per year, and 2.72 per 100,000 people per year.
For the UK reports of CVT in those who received the AZ vaccine, there were 30 out of 18,000,000. That would be 0.002 per 100,000 per year or 2 out of 1,000,000,000 (as of April 2021). Compare this with the real world numbers of 1.32 and 2.72 per 100,000 without AZ vaccine. Why?
Cerebral venous thrombosis risk is higher in people with increased tendencies to produce blood clots. So for people with known blood disorders or on medications that increase clotting tendencies, these are the ones who are at risk for CVT.
Take note, not all cerebral venous thrombosis cases are fatal if diagnosed and managed early. The risk of dying from Covid-19 is much higher, and the contagiousness is a given already.
For Asians, who show more tendency to bleed than clot, there are very little published data (CVT is rare). The biggest study for CVT was in Iran where the incidence was 12.1 per 1 million people per year.
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