大象传媒

Casey Ayres, took part in the Pfizer vaccine trial. He had the initial dose in mid-August and was warned he might experience reactions similar to those from a seasonal flu vaccine. He describes what it was like to participate. Dr Isaac Bogoch, an infectious diseases physician and scientist from the University of Toronto, explains more about the conditions of the trial.

Photo and courtesy: Casey, who assisted in the trails of a Covid-19 vaccine