A coronavirus infection poses a higher risk for developing a blood clot than the first dose of either the Oxford/AstraZeneca or the Pfizer/BioNTech jab, according to a study led by the University of Oxford involving 29 million people who were vaccinated with the first doses of either vaccine between December 2020 and April 2021.

The risk of clotting and other blood disorders following the first dose COVID-19 vaccination is very small and is much higher following covid infection.

Julia Hippisley-Cox, Professor of Clinical Epidemiology and General Practice at the University of Oxford and lead author of the paper says, “People should be aware of these increased risks after COVID-19 vaccination and seek medical attention promptly if they develop symptoms, but also be aware that the risks are considerably higher and over longer periods of time if they become infected with SARS-CoV-2.”