• Associate Professor of Medicine and Scientific Director of McMaster Platelet Immunology Laboratory , McMaster University
A healthcare worker holds up a vial of the AstraZeneca vaccine at a COVID-19 vaccination clinic in Montréal, on March 18. THE CANADIAN PRESS/Paul Chiasson 

Second dose of AstraZeneca COVID‑19 vaccine: FAQs about blood clots, safety, risks and symptoms

Answers to key questions about rare blood clots linked to AstraZeneca’s COVID-19 vaccine, including risks, symptoms and whether people who have had one AstraZeneca shot should have a second.

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