How rare are blood clots after the AstraZeneca vaccine? What should you look out for? And how are they treated?

By Karlheinz Peter, Lab Head, Atherothrombosis and Vascular Biology and Deputy Director, Baker Heart and Diabetes Institute; Interventional Cardiologist, Alfred Hospital; Professor of Medicine and Immunology, Monash University, Baker Heart and Diabetes Institute
James McFadyen, Research Fellow, Baker Heart and Diabetes Institute, Haematologist, Alfred Hospital, Baker Heart and Diabetes Institute

With COVID-19 community transmission on the rise once again, those aged over 50 are weighing up the benefits of being vaccinated against the virus with the very rare risk of blood clotting induced by the AstraZeneca vaccine.

Since the first reports of blood clotting after the AstraZeneca vaccine emerged in March 2021, our understanding of the clotting disorder, called vaccine-induced thrombotic thrombocytopaenia (VITT) or thrombosis with thrombocytopenia…

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