According to the study, 4 in 1 million people experience cerebral venous thrombosis after getting the Pfizer or Moderna vaccine, versus 5 in 1 million people for the AstraZeneca vaccine. The risk of getting CVT is much higher for those who get COVID-19 -- 39 in a million patients -- than it is for those who get vaccinated. AstraZeneca's vaccine use has been halted or limited in many countries on blood clot concern
