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Science on COVID, VITT constantly changing: A look at how doctors keep up by Melissa Couto Zuber, The Canadian Press Posted May 16, 2021 8:00 am EDT Last Updated May 16, 2021 at 8:14 am EDT A vial of AstraZeneca vaccine is seen at a mass COVID-19 vaccination clinic in Calgary, Alta., Thursday, April 22, 2021.THE CANADIAN PRESS/Jeff McIntosh Dr. Ben Chan remembers hearing the preliminary reports back in March of blood clots appearing in a handful of European recipients of the Oxford-AstraZeneca COVID-19 vaccine. The global health expert with the University of Toronto followed the developments ...

  Dr. Ben Chan remembers hearing the preliminary reports back in March of blood clots appearing in a handful of European recipients of the Oxford-AstraZeneca COVID-19 vaccine. The global health expert with the University of Toronto followed the developments closely over ensuing weeks as researchers went from examining what was going on to determining how to diagnose and treat it. The disorder, characterized by low platelet counts, is now called vaccine-induced thrombotic thrombocytopenia, or VITT. It continues to be an exceedingly rare side effect seen in a small number of recipients of a...