Blood Clotting Risk Higher for COVID-19, Than From Vaccines

Researchers at the University of Oxford in England reported that the risk of the rare blood clotting known as cerebral venous thrombosis (CVT) following COVID-19 infection is around 100 times greater than normal. And several times higher than it is post-vaccination or following influenza. The study authors, led by Professor Paul Harrison and Dr. Maxime Taquet, counted the number of CVT cases diagnosed in the two weeks following diagnosis of COVID-19 or after the first dose of a vaccine. They then compared these to calculated incidences of CVT following influenza infection and the background level in the general population. These researchers report that CVT is more common after COVID-19 than in any comparison groups, with 30% of these cases occurring in the under 40 population.