A blood donor clinic pictured at a shopping mall in Calgary, Alta., Friday, March 27, 2020. Scientists have been poring over COVID-19 data in an effort to better understand the still unknown aspects of the virus. The key to unlocking some of those mysteries could be in our blood. Canadian Blood Services is reassuring the public that donated blood from those who have had COVID-19 or from those receiving the vaccine is perfectly safe. THE CANADIAN PRESS/Jeff McIntosh