The largest immunization rollout in Canadian history has begun with the arrival of the first doses of a COVID-19 vaccine. This milestone raises many questions, from why different people get the first shots in different provinces to concerns about potential allergic reactions or adverse side effects when our turn finally comes. Plus, there's already a lot of misinformation out there. Dr. Caroline Quach, chair of Canada’s National Advisory Committee on Immunization (NACI), answers these questions and gives us the science-based facts.