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March 9, 2026

COVID vaccination: we now may know why some people developed blood clots

Richard Buka, University of Birmingham and Samantha Montague, University of Birmingham

A rare clotting disorder puzzled doctors during the COVID vaccine rollout. New research reveals the unlikely chain of events that causes it.

October 30, 2023

Why some people got blood clots after the AstraZeneca vaccine – new clues

Richard Buka, University of Birmingham and Samantha Montague, University of Birmingham

Adenoviral vaccines are widely used. We need to know why some people get deadly blood clots.

Pharmacist Barbara Violo arranges all the empty vials of the AstraZeneca COVID-19 vaccine that she has provided to customers at an independent pharmacy in Toronto. THE CANADIAN PRESS/Nathan Denette

June 3, 2021

AstraZeneca second dose: Should I get the same vaccine or choose Pfizer or Moderna?

Alexander Wong, University of Saskatchewan

Hundreds of thousands of Canadians got a shot of AstraZeneca’s COVID-19 vaccine for their first dose. They now have a choice for their second dose: AstraZeneca again, or Pfizer or Moderna mRNA vaccine?

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

June 2, 2021

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

Dawn ME Bowdish, McMaster University and Ishac Nazy, McMaster University

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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